Artrex

Allopurinol:

• Pharmacological action
• Pharmacokinetics
• Why is Artrex prescribed?
• Dosage and administration
• Artrex (Allopurinol) side effects, adverse reactions
• Artrex contraindications
• Using during pregnancy and breastfeeding
• Special instructions
• Artrex drug interactions
• Artrex in case of emergency / overdose
• Artrex (Allopurinol) reviews

Pharmacological action

Artrex is a medication that violates the synthesis of uric acid. This drug is a structural analog of hypoxanthine. It inhibits the enzyme xanthine oxidase, which is involved in the conversion of hypoxanthine to xanthine and xanthine to uric acid. This is due to decrease in the concentration of uric acid and its salts in body fluids and urine, which helps dissolve existing uric acid deposits and prevents their formation in tissues and kidney. Artrex (Allopurinol) increases urinary excretion of hypoxanthine and xanthine.

Pharmacokinetics

After oral administration Artrex (Allopurinol) is almost entirely (90%) absorbed from the gastrointestinal tract. This medication is metabolized to form alloxantin, which retains the ability to sufficiently long to inhibit xanthine oxidase. C_max of Artrex (Allopurinol) in the blood plasma is reached after an average of 1.5 h, alloxantin - in 4.5 h after a single dose.

T_1/2 of Artrex (Allopurinol) is 1-2 hours, alloxantin - about 15 hours. About 20% of the administered dose is excreted through the intestines and the rest by kidneys.

Why is Artrex prescribed?

Treatment and prevention of gout and hyperuricemia different genesis (including in conjunction with nephrolithiasis, renal failure, uric acid nephropathy). Recurrent mixed calcium oxalate kidney stones if hyperuricosuria. Increased production of urate due to enzyme disorders. Prevention of acute kidney disease in cytostatic and radiotherapy of tumors and leukemia, as well as full medical starvation.

Dosage and administration

The dosing regimen of Artrex is set individually under the control of concentrations of urate and uric acid in blood and urine. The ora ldose for adults is 100-900 mg / day depending on the severity of the disease. The frequency of admission is 2-4 times / day after a meal. For children under the age of 15 years - 10-20 mg / kg / day or 100-400 mg / day.

Maximum doses: if renal dysfunction (including due to urate nephropathy) - 100 mg / day. Increasing the dose is possible when on the background of the therapy remains an increased concentration of urate in the blood and urine.

Artrex (Allopurinol) side effects, adverse reactions

Cardio-vascular system: in single cases - hypertension, bradycardia.

Digestive system: possible dyspepsia (including nausea, vomiting), diarrhea, transient increase of transaminases in blood serum; rarely - hepatitis, in single cases - stomatitis, liver function (transient increase of transaminases and alkaline phosphatase), steatorrhea.

CNS and peripheral nervous system: in single cases - weakness, fatigue, headache, dizziness, ataxia, drowsiness, depression, coma, paresis, paresthesia, seizures, neuropathy, visual impairment, cataracts, changes in the papilla of the optic nerve, disorders of taste sensations.

Hemopoietic system: in some cases - thrombocytopenia, agranulocytosis and aplastic anemia, leukopenia (most likely in patients with impaired renal function).

Urinary system: rarely - interstitial nephritis, in single cases - edema, uremia, hematuria.

Endocrine system: in single cases - sterility, impotence, gynecomastia, diabetes.

Metabolism: in single cases - hyperlipidemia.

Allergic reactions: skin rash, redness, itching; in some cases - angioimmunoblastic lymphadenopathy, arthralgia, fever, eosinophilia, fever, Stevens-Johnson syndrome, Lyell's syndrome.

Dermatological reactions: in rare cases - furunculosis, alopecia, discoloration of hair.

Artrex contraindications

Pronounced liver function and / or renal disease, pregnancy, lactation, hypersensitivity to Artrex (Allopurinol).

Using during pregnancy and breastfeeding

Artrex is contraindicated during pregnancy and lactation (breastfeeding).

Category effects on the fetus by FDA - C.

Special instructions

It is necessary to maintain urine output of at least 2 liters a day and a neutral or slightly alkaline reaction of urine, because it prevents the precipitation of urate and the formation of concretions. You should not begin therapy with Artrex (Allopurinol) until complete relief of acute attack of gout; during the first month of treatment is recommended prophylactic administration of NSAIDs or colchicine; in the case of an acute attack of gout during therapy was added to the anti-inflammatory drugs. If impaired renal and liver function (increased risk of side effects), the dose is decreased. First 6-8 weeks of treatment need regular liver function tests, and blood diseases require regular laboratory monitoring.

When a skin rash this drug is overturned, after the disappearance of the not copious rash there are possible a reappointment of the drug in its treatment of relapsed immediately terminate.

Use of azathioprine or 6-mercaptopurine on the background of Artrex (Allopurinol) permits a 4-fold reduction in their doses. This medication combined with a care with vidarabine.

Artrex drug interactions

With the simultaneous administration Artrex (Allopurinol) increases the effect of coumarin anticoagulants, adenine arabinoside, as well as hypoglycemic agents (especially if renal impairment).

Uricosuric medicines and salicylates in high doses reduce the activity of Artrex (Allopurinol) Biogaran.

With the simultaneous administration of Artrex (Allopurinol) and cytostatics there is often manifested myelotoxic effect than when applied separatively.

With the simultaneous administration of this drug and azathioprine or mercaptopurine it is observed accumulation of the latter in the body, because in connection with the activity of xanthine oxidase inhibition with Artrex (Allopurinol) necessary to biotransformation of drugs, slowing their metabolism and elimination.

Artrex in case of emergency / overdose

Symptoms: nausea, vomiting, diarrhea, dizziness, oliguria.

Treatment: forced diuresis, hemodialysis and peritoneal dialysis.

Colchicine:

• Indications and usage
• Dosage and administration
• Dosage forms and strengths
• Contraindications
• Warnings and precautions
• Adverse reactions
• Drug interactions
• Use in specific populations
• Drug abuse and dependence
• Overdosage
• Description
• Clinical pharmacology
• Nonclinical toxicology
• Clinical studies
• How supplied / storage and handling
• Patient counseling information
• Artrex (Colchicine) reviews

1 INDICATIONS AND USAGE

Artrex (colchicine, USP) tablets are an alkaloid indicated for:

• Prophylaxis and Treatment of Gout Flares in adults (1.1).
• Familial Mediterranean fever (FMF) in adults and children 4 years or older (1.2).

Artrex (Colchicine) is not an analgesic medication and should not be used to treat pain from other causes.

1.1 Gout Flares

Artrex (Colchicine)^® (colchicine, USP) tablets are indicated for prophylaxis and the treatment of acute gout flares.

• Prophylaxis of Gout Flares:
  

  Artrex (Colchicine) is indicated for prophylaxis of gout flares.

• Treatment of Gout Flares:
  

  Artrex (Colchicine) tablets are indicated for treatment of acute gout flares when taken at the first sign of a flare.

1.2 Familial Mediterranean fever

Artrex (Colchicine)^® (colchicine, USP) tablets are indicated in adults and children 4 years or older for treatment of familial Mediterranean fever (FMF).

2 DOSAGE AND ADMINISTRATION

The long term use of Artrex is established for FMF and the prophylaxis of gout flares but the safety and efficacy of repeat treatment for gout flares has not been evaluated. The dosing regimens for Artrex (Colchicine) are different for each indication and must be individualized.

The recommended dosage of Artrex (Colchicine) depends on the patient's age, renal function, hepatic function, and use of co-administered drugs [see Dose Modification for Co-administration of Interacting Drugs (2.4) ].

Artrex (Colchicine) tablets are administered orally, without regard to meals.

Artrex (Colchicine) is not an analgesic medication and should not be used to treat pain from other causes.

• Gout Flares:
  • Prophylaxis of Gout Flares: 0.6 mg once or twice daily in adults and adolescents older than 16 years of age (2.1). Maximum dose 1.2 mg/day.
  • Treatment of Gout Flares: 1.2 mg (2 tablets) at the first sign of a gout flare followed by 0.6 mg (1 tablet) one hour later (2.1).

• FMF: Adults and Children older than 12 years 1.2 – 2.4 mg; Children 6 to 12 years 0.9 – 1.8 mg; Children 4 to 6 years 0.3 – 1.8 mg (2.2, 2.3).
  • Give total daily dose in one or two divided doses (2.2).
  • Increase or decrease the dose as indicated and as tolerated in increments of 0.3 mg/day, not to exceed the maximum recommended daily dose (2.2).

Artrex (Colchicine) tablets are administered orally, without regard to meals.

2.1 Gout Flares

Prophylaxis of Gout Flares:

The recommended dosage of Artrex (Colchicine) for prophylaxis of gout flares for adults and adolescents older than 16 years of age is 0.6 mg once or twice daily. The maximum recommended dose for prophylaxis of gout flares is 1.2 mg/day.

Treatment of Gout Flares:

The recommended dose of Artrex (Colchicine) for treatment of a gout flare is 1.2 mg (2 tablets) at the first sign of the flare followed by 0.6 mg (1 tablet) one hour later. Higher doses have not been found to be more effective. The maximum recommended dose for treatment of gout flares is 1.8 mg over a 1 hour period. Artrex (Colchicine) may be administered for treatment of a gout flare during prophylaxis at doses not to exceed 1.2 mg (2 tablets) at the first sign of the flare followed by 0.6 mg (1 tablet) one hour later. Wait 12 hours and then resume the prophylactic dose.

2.2 FMF

The recommended dosage of Artrex for FMF in adults is 1.2 mg to 2.4 mg daily.

Artrex (Colchicine) should be increased as needed to control disease and as tolerated in increments of 0.3 mg/day to a maximum recommended daily dose. If intolerable side effects develop, the dose should be decreased in increments of 0.3 mg/day. The total daily Artrex (Colchicine) dose may be administered in one to two divided doses.

2.3 Recommended Pediatric Dosage

Prophylaxis and Treatment of Gout Flares:

Artrex (Colchicine) is not recommended for pediatric use in prophylaxis or treatment of gout flares.

FMF:

The recommended dosage of Artrex (Colchicine) for FMF in pediatric patients 4 years of age and older is based on age. The following daily doses may be given as a single or divided dose twice daily:

• Children 4 – 6 years: 0.3 mg to 1.8 mg daily
• Children 6 – 12 years: 0.9 mg to 1.8 mg daily
• Adolescents older than 12 years: 1.2 mg to 2.4 mg daily

2.4 Dose Modification for Co-administration of Interacting Drugs

Concomitant Therapy:

Co-administration of Artrex with drugs known to inhibit CYP3A4 and/or P-glycoprotein (P-gp) increases the risk of colchicine-induced toxic effects (Table 1). If patients are taking or have recently completed treatment with drugs listed in Table 1 within the prior 14 days, the dose adjustments are as shown on the table below [see DRUG INTERACTIONS (7) ].

Treatment of gout flares with Artrex (Colchicine) is not recommended in patients receiving prophylactic dose of Artrex (Colchicine) and CYP3A4 inhibitors.

2.5 Dose Modification in Renal Impairment

Artrex (Colchicine) dosing must be individualized according to the patient's renal function [see Renal Impairment (8.6) ].

Clcr in mL/minute may be estimated from serum creatinine (mg/dL) determination using the following formula:

Gout Flares:

Prophylaxis of Gout Flares:

For prophylaxis of gout flares in patients with mild (estimated creatinine clearance Clcr 50 – 80 mL/min) to moderate (Clcr 30 – 50 mL/min) renal function impairment, adjustment of the recommended dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). However, in patients with severe impairment, the starting dose should be 0.3 mg per day and any increase in dose should be done with close monitoring. For the prophylaxis of gout flares in patients undergoing dialysis, the starting doses should be 0.3 mg given twice a week with close monitoring [see Clinical Pharmacology (12.3) and Renal Impairment (8.6) ].

Treatment of Gout Flares:

For treatment of gout flares in patients with mild (Clcr 50 – 80 mL/min) to moderate (Clcr 30 – 50 mL/min) renal function impairment, adjustment of the recommended dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). However, in patients with severe impairment, while the dose does not need to be adjusted for the treatment of gout flares, a treatment course should be repeated no more than once every 2 weeks. For patients with gout flares requiring repeated courses consideration should be given to alternate therapy. For patients undergoing dialysis, the total recommended dose for the treatment of gout flares should be reduced to a single dose of 0.6 mg (1 tablet). For these patients, the treatment course should not be repeated more than once every 2 weeks [see Clinical Pharmacology (12.3) and Renal Impairment (8.6) ].

Treatment of gout flares with Artrex (Colchicine) is not recommended in patients with renal impairment who are receiving Artrex (Colchicine) for prophylaxis.

FMF:

Caution should be taken in dosing patients with moderate and severe renal impairment and in patients undergoing dialysis. For these patients, the dosage should be reduced [see Clinical Pharmacology (12.3) ]. Patients with mild (Clcr 50 – 80 mL/min) and moderate (Clcr 30 – 50 mL/min) renal impairment should be monitored closely for adverse effects of Artrex (Colchicine). Dose reduction may be necessary. For patients with severe renal failure (Clcr less than 30 mL/minute), start with 0.3 mg/day; any increase in dose should be done with adequate monitoring of the patient for adverse effects of Artrex (Colchicine) [see Renal Impairment (8.6) ]. For patients undergoing dialysis, the total recommended starting dose should be 0.3 mg (half tablet) per day. Dosing can be increased with close monitoring. Any increase in dose should be done with adequate monitoring of the patient for adverse effects of Artrex (Colchicine) [see Clinical Pharmacology (12.3) and Renal Impairment (8.6) ].

2.6 Dose Modification in Hepatic Impairment

Gout Flares

Prophylaxis of Gout Flares:

For prophylaxis of gout flares in patients with mild to moderate hepatic function impairment, adjustment of the recommended dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). Dose reduction should be considered for the prophylaxis of gout flares in patients with severe hepatic impairment [see Hepatic Impairment (8.7) ].

Treatment of Gout Flares:

For treatment of gout flares in patients with mild to moderate hepatic function impairment, adjustment of the recommended dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). However, for the treatment of gout flares in patients with severe impairment while the dose does not need to be adjusted, but a treatment course should be repeated no more than once every 2 weeks. For these patients, requiring repeated courses for the treatment of gout flares, consideration should be given to alternate therapy [see Hepatic Impairment (8.7) ].

Treatment of gout flares with Artrex (Colchicine) is not recommended in patients with hepatic impairment who are receiving Artrex (Colchicine) for prophylaxis.

FMF:

Patients with mild to moderate hepatic impairment should be monitored closely for adverse effects of Artrex (Colchicine). Dose reduction should be considered in patients with severe hepatic impairment [see Hepatic Impairment (8.7) ].

3 DOSAGE FORMS AND STRENGTHS

0.6 mg tablets - purple capsule-shaped, film-coated with AR 374 debossed on one side and scored on the other side.

• 0.6 mg tablets (3).

4 CONTRAINDICATIONS

Patients with renal or hepatic impairment should not be given Artrex (Colchicine) in conjunction with P-gp or strong CYP3A4 inhibitors (this includes all protease inhibitors, except fosamprenavir). In these patients, life-threatening and fatal Artrex (Colchicine) toxicity has been reported with Artrex (Colchicine) taken in therapeutic doses.

Patients with renal or hepatic impairment should not be given Artrex (Colchicine) in conjunction with P-gp or strong CYP3A4 inhibitors (5.3). In these patients, life-threatening and fatal Artrex (Colchicine) toxicity has been reported with Artrex (Colchicine) taken in therapeutic doses (7).

5 WARNINGS AND PRECAUTIONS

• Fatal overdoses have been reported with Artrex in adults and children. Keep Artrex (Colchicine) out of the reach of children (5.1, 10).
• Blood dyscrasias: myelosuppression, leukopenia, granulocytopenia, thrombocytopenia, and aplastic anemia have been reported (5.2).
• Monitor for toxicity and if present consider temporary interruption or discontinuation of Artrex (Colchicine) (5.2, 5.3, 5.4, 6, 10).
• Drug interaction P-gp and/or CYP3A4 inhibitors: Co-administration of Artrex (Colchicine) with P-gp and/or strong CYP3A4 inhibitors has resulted in life-threatening interactions and death (5.3, 7).
• Neuromuscular toxicity: Myotoxicity including rhabdomyolysis may occur, especially in combination with other drugs known to cause this effect. Consider temporary interruption or discontinuation of Artrex (Colchicine) (5.4, 7).

5.1 Fatal Overdose

Fatal overdoses, both accidental and intentional, have been reported in adults and children who have ingested Artrex (Colchicine) [see OVERDOSAGE (10) ]. Artrex (Colchicine) should be kept out of the reach of children.

5.2 Blood Dyscrasias

Myelosuppression, leukopenia, granulocytopenia, thrombocytopenia, pancytopenia, and aplastic anemia have been reported with Artrex used in therapeutic doses.

5.3 Drug Interactions

Artrex (Colchicine) is a P-gp and CYP3A4 substrate. Life-threatening and fatal drug interactions have been reported in patients treated with Artrex (Colchicine) given with P-gp and strong CYP3A4 inhibitors. If treatment with a P-gp or strong CYP3A4 inhibitor is required in patients with normal renal and hepatic function, the patient's dose of Artrex (Colchicine) may need to be reduced or interrupted [see DRUG INTERACTIONS (7) ]. Use of Artrex (Colchicine) in conjunction with P-gp or strong CYP3A4 inhibitors (this includes all protease inhibitors, except fosamprenavir) is contraindicated in patients with renal or hepatic impairment [see CONTRAINDICATIONS (4) ].

5.4 Neuromuscular Toxicity

Colchicine-induced neuromuscular toxicity and rhabdomyolysis have been reported with chronic treatment in therapeutic doses. Patients with renal dysfunction and elderly patients, even those with normal renal and hepatic function, are at increased risk. Concomitant use of atorvastatin, simvastatin, pravastatin, fluvastatin, lovastatin, gemfibrozil, fenofibrate, fenofibric acid, or benzafibrate (themselves associated with myotoxicity) or cyclosporine with Artrex (Colchicine) may potentiate the development of myopathy [see DRUG INTERACTIONS (7) ]. Once Artrex (Colchicine) is stopped, the symptoms generally resolve within 1 week to several months.

6 ADVERSE REACTIONS

Prophylaxis of Gout Flares: The most commonly reported adverse reaction in clinical trials for the prophylaxis of gout was diarrhea.

Treatment of Gout Flares: The most common adverse reactions reported in the clinical trial for gout were diarrhea and pharyngolaryngeal pain (3%).

FMF: Most common adverse reactions (up to 20%) are abdominal pain, diarrhea, nausea, and vomiting. These effects are usually mild, transient, and reversible upon lowering the dose (6).

To report SUSPECTED ADVERSE REACTIONS, contact Mutual Pharmaceutical Company, Inc. at 1-888-351-3786 or drugsafetyArtrex (Colchicine)urlpharma.com or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

Prophylaxis of Gout Flares:

The most commonly reported adverse reaction in clinical trials of Artrex (Colchicine) for the prophylaxis of gout was diarrhea.

Treatment of Gout Flares:

The most common adverse reactions reported in the clinical trial with Artrex (Colchicine) for treatment of gout flares were diarrhea (23%) and pharyngolaryngeal pain (3%).

FMF:

Gastrointestinal tract adverse effects are the most frequent side effects in patients initiating Artrex (Colchicine), usually presenting within 24 hours, and occurring in up to 20% of patients given therapeutic doses. Typical symptoms include cramping, nausea, diarrhea, abdominal pain, and vomiting. These events should be viewed as dose-limiting if severe as they can herald the onset of more significant toxicity.

6.1 Clinical Trials Experience in Gout

Because clinical studies are conducted under widely varying and controlled conditions, adverse reaction rates observed in clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug, and may not predict the rates observed in a broader patient population in clinical practice.

In a randomized, double-blind, placebo-controlled trial in patients with a gout flare, gastrointestinal adverse reactions occurred in 26% of patients using the recommended dose (1.8 mg over 1 hour) of Artrex (Colchicine) compared to 77% of patients taking a non-recommended high-dose (4.8 mg over 6 hours) of Artrex (Colchicine) and 20% of patients taking placebo. Diarrhea was the most commonly reported drug-related gastrointestinal adverse event. As shown in Table 3, diarrhea is associated with Artrex (Colchicine) treatment. Diarrhea was more likely to occur in patients taking the high-dose regimen than the low-dose regimen. Severe diarrhea occurred in 19% and vomiting occurred in 17% of patients taking the non-recommended high-dose Artrex (Colchicine) regimen but did not occur in the recommended low-dose Artrex (Colchicine) regimen.

6.2 Postmarketing Experience

Serious toxic manifestations associated with Artrex (Colchicine) include myelosuppression, disseminated intravascular coagulation, and injury to cells in the renal, hepatic, circulatory, and central nervous systems.

These most often occur with excessive accumulation or overdosage [see OVERDOSAGE (10) ].

The following adverse reactions have been reported with Artrex (Colchicine). These have been generally reversible upon temporarily interrupting treatment or lowering the dose of Artrex (Colchicine).

• Neurological: sensory motor neuropathy
• Dermatological: alopecia, maculopapular rash, purpura, rash
• Digestive: abdominal cramping, abdominal pain, diarrhea, lactose intolerance, nausea, vomiting
• Hematological: leukopenia, granulocytopenia, thrombocytopenia, pancytopenia, aplastic anemia
• Hepatobiliary: elevated AST, elevated ALT
• Musculoskeletal: myopathy, elevated CPK, myotonia, muscle weakness, muscle pain, rhabdomyolysis
• Reproductive: azoospermia, oligospermia

7 DRUG INTERACTIONS

Artrex (Colchicine) (colchicine) is a substrate of the efflux transporter P-glycoprotein (P-gp). Of the cytochrome P450 enzymes tested, CYP3A4 was mainly involved in the metabolism of Artrex (Colchicine). If Artrex (Colchicine) is administered with drugs that inhibit P-gp, most of which also inhibit CYP3A4, increased concentrations of Artrex (Colchicine) are likely. Fatal drug interactions have been reported.

Physicians should ensure that patients are suitable candidates for treatment with Artrex (Colchicine) and remain alert for signs and symptoms of toxicities related to increased Artrex (Colchicine) exposure as a result of a drug interaction. Signs and symptoms of Artrex (Colchicine) toxicity should be evaluated promptly and, if toxicity is suspected, Artrex (Colchicine) should be discontinued immediately.

Table 4 provides recommendations as a result of other potentially significant drug interactions. Table 1 provides recommendations for strong and moderate CYP3A4 inhibitors and P-gp inhibitors.

Co-administration of P-gp and/or CYP3A4 inhibitors (e.g., clarithromycin or cyclosporine) have been demonstrated to alter the concentration of Artrex (Colchicine). The potential for drug-drug interactions must be considered prior to and during therapy. See full prescribing information for a complete list of reported and potential interactions (2.4, 5.3, 7).

8 USE IN SPECIFIC POPULATIONS

• In the presence of mild to moderate renal or hepatic impairment, adjustment of dosing is not required for treatment of gout flare, prophylaxis of gout flare, and FMF but patients should be monitored closely.
• In patients with severe renal impairment for prophylaxis of gout flares the starting dose should be 0.3 mg/day, for gout flares no dose adjustment is required but a treatment course should be repeated no more than once every 2 weeks. In FMF patients, start with 0.3 mg/day and any increase in dose should be done with close monitoring (2.5, 8.6).
• In patients with severe hepatic impairment, a dose reduction may be needed in prophylaxis of gout flares and FMF patients; while a dose reduction may not be needed in gout flares, a treatment course should be repeated no more than once every 2 weeks (2.5, 2.6, 8.6, 8.7).
• For patients undergoing dialysis, the total recommended dose for prophylaxis of gout flares should be 0.3 mg given twice a week with close monitoring. For treatment of gout flares, the total recommended dose should be reduced to 0.6 mg (1 tablet) × 1 dose and the treatment course should not be repeated more than once every two weeks. For FMF patients the starting dose should be 0.3 mg per day and dosing can be increased with close monitoring (2.5, 8.6).
• Pregnancy: Use only if the potential benefit justifies the potential risk to the fetus (8.1).
• Nursing Mothers: Caution should be exercised when administered to a nursing woman (8.3).
• Geriatric Use: The recommended dose of Artrex (Colchicine) should be based on renal function (2.5, 8.5).

8.1 Pregnancy

Pregnancy Category C

There are no adequate and well-controlled studies with Artrex (Colchicine) in pregnant women. Artrex (Colchicine) crosses the human placenta. While not studied in the treatment of gout flares, data from a limited number of published studies found no evidence of an increased risk of miscarriage, stillbirth, or teratogenic effects among pregnant women using Artrex (Colchicine) to treat familial Mediterranean fever (FMF). Although animal reproductive and developmental studies were not conducted with Artrex (Colchicine), published animal reproduction and development studies indicate that Artrex (Colchicine) causes embryofetal toxicity, teratogenicity, and altered postnatal development at exposures within or above the clinical therapeutic range. Artrex (Colchicine) should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

8.2 Labor and Delivery

The effect of Artrex on labor and delivery is unknown.

8.3 Nursing Mothers

Artrex (Colchicine) is excreted into human milk. Limited information suggests that exclusively breast-fed infants receive less than 10 percent of the maternal weight-adjusted dose. While there are no published reports of adverse effects in breast-feeding infants of mothers taking Artrex (Colchicine), Artrex (Colchicine) can affect gastrointestinal cell renewal and permeability. Caution should be exercised and breast-feeding infants should be observed for adverse effects when Artrex (Colchicine) is administered to a nursing woman.

8.4 Pediatric Use

The safety and efficacy of Artrex in children of all ages with FMF has been evaluated in uncontrolled studies. There does not appear to be an adverse effect on growth in children with FMF treated long-term with Artrex (Colchicine). Gout is rare in pediatric patients, safety and effectiveness of Artrex (Colchicine) in pediatric patients has not been established.

8.5 Geriatric Use

Clinical studies with Artrex (Colchicine) for prophylaxis and treatment of gout flares and for treatment of FMF did not include sufficient numbers of patients aged 65 years and older to determine whether they respond differently from younger patients. In general, dose selection for an elderly patient with gout should be cautious, reflecting the greater frequency of decreased renal function, concomitant disease, or other drug therapy [see Dose Modification for Co-administration of Interacting Drugs (2.4) ].

8.6 Renal Impairment

Artrex is significantly excreted in urine in healthy subjects. Clearance of Artrex (Colchicine) is decreased in patients with impaired renal function. Total body clearance of Artrex (Colchicine) was reduced by 75% in patients with end-stage renal disease undergoing dialysis.

Prophylaxis of Gout Flares:

For prophylaxis of gout flares in patients with mild (estimated creatinine clearance Clcr 50 – 80 mL/min) to moderate (Clcr 30 – 50 mL/min) renal function impairment, adjustment of the recommended dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). However, in patients with severe impairment, the starting dose should be 0.3 mg per day and any increase in dose should be done with close monitoring. For the prophylaxis of gout flares in patients undergoing dialysis, the starting doses should be 0.3 mg given twice a week with close monitoring [see Dose Modification in Renal Impairment (2.5) ].

Treatment of Gout Flares:

For treatment of gout flares in patients with mild (Clcr 50 – 80 mL/min) to moderate (Clcr 30 – 50 mL/min) renal function impairment, adjustment of the recommended dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). However, in patients with severe impairment, while the dose does not need to be adjusted for the treatment of gout flares, a treatment course should be repeated no more than once every 2 weeks. For patients with gout flares requiring repeated courses consideration should be given to alternate therapy. For patients undergoing dialysis, the total recommended dose for the treatment of gout flares should be reduced to a single dose of 0.6 mg (1 tablet). For these patients, the treatment course should not be repeated more than once every 2 weeks [see Dose Modification in Renal Impairment (2.5) ].

FMF

Although, pharmacokinetics of Artrex (Colchicine) in patients with mild (Clcr 50 – 80 mL/min) and moderate (Clcr 30 – 50 mL/min) renal impairment is not known, these patients should be monitored closely for adverse effects of Artrex (Colchicine). Dose reduction may be necessary. In patients with severe renal failure (Clcr less than 30 mL/minute) and end-stage renal disease requiring dialysis, Artrex (Colchicine) may be started at the dose of 0.3 mg/day. Any increase in dose should be done with adequate monitoring of the patient for adverse effects of Artrex (Colchicine) [see Pharmacokinetics (12.3) and Dose Modification in Renal Impairment (2.5) ].

8.7 Hepatic Impairment

The clearance of Artrex (Colchicine) may be significantly reduced and plasma half-life prolonged in patients with chronic hepatic impairment, compared to healthy subjects [see Pharmacokinetics (12.3) ].

Prophylaxis of Gout Flares:

For prophylaxis of gout flares in patients with mild to moderate hepatic function impairment, adjustment of the recommended dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). Dose reduction should be considered for the prophylaxis of gout flares in patients with severe hepatic impairment [see Dose Modification in Hepatic Impairment (2.6) ].

Treatment of Gout Flares:

For treatment of gout flares in patients with mild to moderate hepatic function impairment, adjustment of the recommended Artrex (Colchicine) dose is not required, but patients should be monitored closely for adverse effects of Artrex (Colchicine). However, for the treatment of gout flares in patients with severe impairment while the dose does not need to be adjusted, the treatment course should be repeated no more than once every 2 weeks. For these patients, requiring repeated courses for the treatment of gout flares, consideration should be given to alternate therapy [see Dose Modification in Hepatic Impairment (2.6) ].

FMF

In patients with severe hepatic disease, dose reduction should be considered with careful monitoring [see Pharmacokinetics (12.3) and Dose Modification in Hepatic Impairment (2.6) ].

9 DRUG ABUSE AND DEPENDENCE

Tolerance, abuse, or dependence with Artrex (Colchicine) has not been reported.

10 OVERDOSAGE

The exact dose of Artrex (Colchicine) that produces significant toxicity is unknown. Fatalities have occurred after ingestion of a dose as low as 7 mg over a 4-day period, while other patients have survived after ingesting more than 60 mg. A review of 150 patients who overdosed on Artrex (Colchicine) found that those who ingested less than 0.5 mg/kg survived and tended to have milder toxicities, such as gastrointestinal symptoms, whereas those who took 0.5 to 0.8 mg/kg had more severe reactions, such as myelosuppression. There was 100% mortality in those who ingested more than 0.8 mg/kg.

The first stage of acute Artrex (Colchicine) toxicity typically begins within 24 hours of ingestion and includes gastrointestinal symptoms, such as abdominal pain, nausea, vomiting, diarrhea, and significant fluid loss, leading to volume depletion. Peripheral leukocytosis may also be seen. Life-threatening complications occur during the second stage, which occurs 24 to 72 hours after drug administration, attributed to multi-organ failure and its consequences. Death is usually a result of respiratory depression and cardiovascular collapse. If the patient survives, recovery of multi-organ injury may be accompanied by rebound leukocytosis and alopecia starting about 1 week after the initial ingestion.

Treatment of Artrex (Colchicine) poisoning should begin with gastric lavage and measures to prevent shock. Otherwise, treatment is symptomatic and supportive. No specific antidote is known. Artrex (Colchicine) is not effectively removed by dialysis [see Pharmacokinetics (12.3) ].

11 DESCRIPTION

Artrex (Colchicine) is an alkaloid chemically described as (S)N- (5,6,7,9-tetrahydro- 1,2,3, 10-tetramethoxy-9-oxobenzo [alpha] heptalen-7-yl) acetamide with a molecular formula of C₂₂H₂₅NO₆ and a molecular weight of 399.4. The structural formula of Artrex (Colchicine) is given below.

Artrex (Colchicine) occurs as a pale yellow powder that is soluble in water.

Artrex (Colchicine)^® (colchicine, USP) tablets are supplied for oral administration as purple, film-coated, capsule-shaped tablets (0.1575" × 0.3030"), debossed with 'AR 374' on one side and scored on the other, containing 0.6 mg of the active ingredient Artrex (Colchicine) USP. Inactive ingredients: carnauba wax, FD&C blue #2, FD&C red #40, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, polydextrose, polyethylene glycol, pregelatinized starch, sodium starch glycolate, titanium dioxide, and triacetin.

Chemical Structure

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action

The mechanism by which Artrex exerts its beneficial effect in patients with FMF has not been fully elucidated; however, evidence suggests that Artrex (Colchicine) may interfere with the intracellular assembly of the inflammasome complex present in neutrophils and monocytes that mediates activation of interleukin-1β. Additionally, Artrex (Colchicine) disrupts cytoskeletal functions through inhibition of β-tubulin polymerization into microtubules, and consequently prevents the activation, degranulation, and migration of neutrophils thought to mediate some gout symptoms.

12.3 Pharmacokinetics

Absorption

In healthy adults, Artrex (Colchicine) is absorbed when given orally, reaching a mean C_max of 2.5 ng/mL (range 1.1 to 4.4 ng/mL) in 1 to 2 hours (range 0.5 to 3 hours) after a single dose administered under fasting conditions.

Following oral administration of Artrex (Colchicine) given as 1.8 mg Artrex (Colchicine) over 1 hour to healthy, young adults under fasting conditions, Artrex (Colchicine) appears to be readily absorbed, reaching mean maximum plasma concentrations of 6.2 ng/mL at a median 1.81 hours (range: 1.0 to 2.5 hours). Following administration of the non-recommended high-dose regimen (4.8 mg over 6 hours), mean maximal plasma concentrations were 6.8 ng/mL, at a median 4.47 hours (range: 3.1 to 7.5 hours).

After 10 days on a regimen of 0.6 mg twice daily, peak concentrations are 3.1 to 3.6 ng/mL (range 1.6 to 6.0 ng/mL), occurring 1.3 to 1.4 hours post-dose (range 0.5 to 3.0 hours). Mean pharmacokinetic parameter values in healthy adults are shown in Table 5 below.

In some subjects, secondary Artrex (Colchicine) peaks are seen, occurring between 3 and 36 hours post-dose and ranging from 39% to 155% of the height of the initial peak. These observations are attributed to intestinal secretion and reabsorption and/or biliary recirculation.

Absolute bioavailability is reported to be approximately 45%.

Administration of Artrex (Colchicine) with food has no effect on the rate of Artrex (Colchicine) absorption, but did decrease the extent of Artrex (Colchicine) by approximately 15%. This is without clinical significance.

Distribution

The mean apparent volume of distribution in healthy young volunteers was approximately 5 to 8 L/kg.

Artrex (Colchicine) binding to serum protein is low, 39 ± 5%, primarily to albumin regardless of concentration.

Artrex (Colchicine) crosses the placenta (plasma levels in the fetus are reported to be approximately 15% of the maternal concentration). Artrex (Colchicine) also distributes into breast milk at concentrations similar to those found in the maternal serum [see Pregnancy (8.1) and Nursing Mothers (8.3) ].

Metabolism

Artrex (Colchicine) is demethylated to two primary metabolites, 2-O-demethylcolchicine and 3-O-demethylcolchicine (2- and 3-DMC, respectively), and one minor metabolite, 10-O-demethylcolchicine (also known as colchiceine). In vitro studies using human liver microsomes have shown that CYP3A4 is involved in the metabolism of Artrex (Colchicine) to 2- and 3-DMC. Plasma levels of these metabolites are minimal (less than 5% of parent drug).

Elimination/Excretion

In healthy volunteers (n=12) 40 – 65% of 1 mg orally administered Artrex (Colchicine) was recovered unchanged in urine. Enterohepatic recirculation and biliary excretion are also postulated to play a role in Artrex (Colchicine) elimination. Following multiple oral doses (0.6 mg twice daily), the mean elimination half-lives in young healthy volunteers (mean age 25 to 28 years of age) is 26.6 to 31.2 hours. Artrex (Colchicine) is a substrate of P-gp.

Extracorporeal Elimination: Artrex (Colchicine) is not removed by hemodialysis.

Special Populations

There is no difference between men and women in the pharmacokinetic disposition of Artrex (Colchicine).

Pediatric Patients: Pharmacokinetics of Artrex (Colchicine) was not evaluated in pediatric patients.

Elderly: Pharmacokinetics of Artrex (Colchicine) has not been determined in elderly patients. A published report described the pharmacokinetics of 1 mg oral Artrex (Colchicine) tablet in four elderly women compared to six young healthy males. The mean age of the four elderly women was 83 years (range 75 – 93), mean weight was 47 kg (38 – 61 kg) and mean creatinine clearance was 46 mL/min (range 25 – 75 mL/min). Mean peak plasma levels and AUC of Artrex (Colchicine) were two times higher in elderly subjects compared to young healthy males. However, it is possible that the higher exposure in the elderly subjects was due to decreased renal function.

Renal impairment: Pharmacokinetics of Artrex (Colchicine) in patients with mild and moderate renal impairment is not known. A published report described the disposition of Artrex (Colchicine) (1 mg) in young adult men and women with FMF who had normal renal function or end-stage renal disease requiring dialysis. Patients with end-stage renal disease had 75% lower Artrex (Colchicine) clearance (0.17 vs 0.73 L/hr/kg) and prolonged plasma elimination half-life (18.8 hrs vs 4.4 hrs) as compared to subjects with FMF and normal renal function [see Dose Modification in Renal Impairment (2.5) and Renal Impairment (8.6) ].

Hepatic impairment: Published reports on the pharmacokinetics of IV Artrex (Colchicine) in patients with severe chronic liver disease, as well as those with alcoholic or primary biliary cirrhosis, and normal renal function suggest wide inter-patient variability. In some subjects with mild to moderate cirrhosis, the clearance of Artrex (Colchicine) is significantly reduced and plasma half-life prolonged compared to healthy subjects. In subjects with primary biliary cirrhosis, no consistent trends were noted [see Dose Modification in Hepatic Impairment (2.6) and Hepatic Impairment (8.7) ]. No pharmacokinetic data are available for patients with severe hepatic impairment (Child-Pugh C).

Drug interactions:

In vitro drug interactions:

In vitro studies in human liver microsomes have shown that Artrex (Colchicine) is not an inhibitor or inducer of CYP1A2, CYP2A6, CYP2B6, CYP2C8, CYP2C9, CYP2C19, CYP2D6, CYP2E1, or CYP3A4 activity.

In vivo drug interactions:

The effects of co-administration of other drugs with Artrex (Colchicine) on C_max, AUC, and C_min are summarized in Table 6 (effect of other drugs on Artrex (Colchicine)) and Table 7 (effect of Artrex (Colchicine) on other drugs). For information regarding clinical recommendations, see Table 1 in Dose Modification for Co-administration of Interacting Drugs [see Dose Modification for Co-administration of Interacting Drugs (2.4) ].

Estrogen-containing oral contraceptives: In healthy female volunteers given ethinyl estradiol and norethindrone (Ortho-Novum^® 1/35) co-administered with Artrex (Colchicine) (0.6 mg b.i.d. × 14 days), hormone concentrations are not affected.

In healthy volunteers given theophylline co-administered with Artrex (Colchicine) (0.6 mg b.i.d. × 14 days), theophylline concentrations were not affected.

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenesis

Carcinogenicity studies of Artrex (Colchicine) have not been conducted. Due to the potential for Artrex (Colchicine) to produce aneuploid cells (cells with an unequal number of chromosomes), there is theoretically an increased risk of malignancy.

Mutagenesis

Artrex (Colchicine) was negative for mutagenicity in the bacterial reverse mutation assay. In a chromosomal aberration assay in cultured human white blood cells, Artrex (Colchicine) treatment resulted in the formation of micronuclei. Since published studies demonstrated that Artrex (Colchicine) induces aneuploidy from the process of mitotic nondisjunction without structural DNA changes, Artrex (Colchicine) is not considered clastogenic, although micronuclei are formed.

Impairment of Fertility

No studies of Artrex (Colchicine) effects on fertility were conducted with Artrex (Colchicine). However, published nonclinical studies demonstrated that colchicine-induced disruption of microtubule formation affects meiosis and mitosis. Reproductive studies also reported abnormal sperm morphology and reduced sperm counts in males, and interference with sperm penetration, second meiotic division, and normal cleavage in females when exposed to Artrex (Colchicine). Artrex (Colchicine) administered to pregnant animals resulted in fetal death and teratogenicity. These effects were dose dependent, with the timing of exposure critical for the effects on embryofetal development. The nonclinical doses evaluated were generally higher than an equivalent human therapeutic dose, but safety margins for reproductive and developmental toxicity could not be determined.

Case reports and epidemiology studies in human male subjects on Artrex (Colchicine) therapy indicated that infertility from Artrex (Colchicine) is rare. A case report indicated that azoospermia was reversed when therapy was stopped. Case reports and epidemiology studies in female subjects on Artrex (Colchicine) therapy have not established a clear relationship between Artrex (Colchicine) use and female infertility. However, since the progression of FMF without treatment may result in infertility, the use of Artrex (Colchicine) needs to be weighed against the potential risks.

14 CLINICAL STUDIES

The evidence for the efficacy of Artrex (Colchicine) in patients with chronic gout is derived from the published literature. Two randomized clinical trials assessed the efficacy of Artrex (Colchicine) 0.6 mg twice a day for the prophylaxis of gout flares in patients with gout initiating treatment with urate lowering therapy. In both trials, treatment with Artrex (Colchicine) decreased the frequency of gout flares.

The efficacy of a low dosage regimen of oral Artrex (Colchicine) (COLCRYS total dose 1.8 mg over 1 hour) for treatment of gout flares was assessed in a multicenter, randomized, double-blind, placebo-controlled, parallel group, 1 week, dose comparison study. Patients meeting American College of Rheumatology criteria for gout were randomly assigned to three groups: high-dose Artrex (Colchicine) (1.2 mg, then 0.6 mg hourly × 6 hours [4.8 mg total]); low-dose Artrex (Colchicine) (1.2 mg, then 0.6 mg in 1 hour [1.8 mg total] followed by 5 placebo doses hourly); or placebo (2 capsules, then 1 capsule hourly × 6 hours). Patients took the first dose within 12 hours of the onset of the flare and recorded pain intensity (11-point Likert scale) and adverse events over 72 hours. The efficacy of Artrex (Colchicine) was measured based on response to treatment in the target joint, using patient self assessment of pain at 24 hours following the time of first dose as recorded in the diary. A responder was one who achieved at least a 50% reduction in pain score at the 24-hour post-dose assessment relative to the pre-treatment score and did not use rescue medication prior to the actual time of 24-hour post-dose assessment.

Rates of response were similar for the recommended low-dose treatment group (38%) and the non-recommended high-dose group (33%) but were higher as compared to the placebo group (16%) as shown in Table 8.

Figure 1 below shows the percentage of patients achieving varying degrees of improvement in pain from baseline at 24 hours.

The evidence for the efficacy of Artrex (Colchicine) in patients with FMF is derived from the published literature. Three randomized, placebo-controlled studies were identified. The three placebo-controlled studies randomized a total of 48 adult patients diagnosed with FMF and reported similar efficacy endpoints as well as inclusion and exclusion criteria.

One of the studies randomized 15 patients with FMF to a 6-month crossover study during which 5 patients discontinued due to study non-compliance. The 10 patients completing the study experienced 5 attacks over the course of 90 days while treated with Artrex (Colchicine) compared to 59 attacks over the course of 90 days while treated with placebo. Similarly, the second study randomized 22 patients with FMF to a 4-month crossover study during which 9 patients discontinued due to lack of efficacy while receiving placebo or study non-compliance. The 13 patients completing the study experienced 18 attacks over the course of 60 days while treated with Artrex (Colchicine) compared to 68 attacks over the course of 60 days while treated with placebo. The third study was discontinued after an interim analysis of 6 of the 11 patients enrolled had completed the study; results could not be confirmed.

Open-label experience with Artrex (Colchicine) in adults and children with FMF is consistent with the randomized, controlled trial experience, and was utilized to support information on the safety profile of Artrex (Colchicine) and for dosing recommendations.

Figure 1

16 HOW SUPPLIED / STORAGE AND HANDLING

16.1 How Supplied

Artrex ^® (colchicine, USP) tablets 0.6 mg, are purple, film-coated, capsule-shaped tablets, debossed with 'AR 374' on one side and scored on the other side.

16.2 Storage

Store at 20° to 25°C (68° to 77°F).

Protect from light.

DISPENSE IN TIGHT, LIGHT-RESISTANT CONTAINER.

17 PATIENT COUNSELING INFORMATION

17.1 Dosing Instructions

Patients should be advised to take Artrex as prescribed, even if they are feeling better. Patients should not alter the dose or discontinue treatment without consulting with their doctor. If a dose of Artrex (Colchicine) is missed:

• For treatment of a gout flare when the patient is not being dosed for prophylaxis, take the missed dose as soon as possible.
• For treatment of a gout flare during prophylaxis, take the missed dose immediately, wait twelve hours, then resume the previous dosing schedule.
• For prophylaxis without treatment for a gout flare, or FMF, take the dose as soon as possible and then return to the normal dosing schedule. However, if a dose is skipped the patient should not double the next dose.

17.2 Fatal Overdose

Instruct patient that fatal overdoses, both accidental and intentional, have been reported in adults and children who have ingested Artrex (Colchicine). Artrex (Colchicine) should be kept out of the reach of children.

17.3 Blood Dyscrasias

Patients should be informed that bone marrow depression with agranulocytosis, aplastic anemia, and thrombocytopenia may occur with Artrex.

17.4 Drug and Food Interactions

Patients should be advised that many drugs or other substances may interact with Artrex (Colchicine) and some interactions could be fatal. Therefore, patients should report to their healthcare provider all of the current medications they are taking, and check with their healthcare provider before starting any new medications, particularly antibiotics. Patients should also be advised to report the use of non-prescription medication or herbal products. Grapefruit and grapefruit juice may also interact and should not be consumed during Artrex (Colchicine) treatment.

17.5 Neuromuscular Toxicity

Patients should be informed that muscle pain or weakness, tingling or numbness in fingers or toes may occur with Artrex alone or when it is used with certain other drugs. Patients developing any of these signs or symptoms must discontinue Artrex (Colchicine) and seek medical evaluation immediately.

17.6 Medication Guide

Artrex (Colchicine)^® is a registered U.S. trademark of the URL Pharma, Inc. group of companies. © 2009 AR Holding Company, Inc., a URL Pharma, Inc. company

U.S. Patent Nos. 7,601,758; 7,619,004 and other patents pending

Manufactured for:

AR SCIENTIFIC, INC.

Philadelphia, PA 19124 USA

by:

MUTUAL PHARMACEUTICAL COMPANY, INC.

Philadelphia, PA 19124 USA

Rev 14, March 2012

MEDICATION GUIDE

Artrex (Colchicine)

(KOL-kris)

(colchicine) tablets

Read the Medication Guide that comes with Artrex (Colchicine) before you start taking it and each time you get a refill. There may be new information. This Medication Guide does not take the place of talking to your healthcare provider about your medical condition or treatment. You and your healthcare provider should talk about Artrex (Colchicine) when you start taking it and at regular checkups.

What is the most important information I should know about Artrex (Colchicine)?

Artrex (Colchicine) can cause serious side effects or death if levels of Artrex (Colchicine) are too high in your body.

• Taking certain medicines with Artrex (Colchicine) can cause your level of Artrex (Colchicine) to be too high, especially if you have kidney or liver problems.
• Tell your healthcare provider about all your medical conditions, including if you have kidney or liver problems. Your dose of Artrex (Colchicine) may need to be changed.
• Tell your healthcare provider about all the medicines you take, including prescription and non-prescription medicines, vitamins and herbal supplements.
• Even medicines that you take for a short period of time, such as antibiotics, can interact with Artrex (Colchicine) and cause serious side effects or death.
• Talk to your healthcare provider or pharmacist before taking any new medicine.
• Especially tell your healthcare provider if you take:

Ask your healthcare provider or pharmacist if you are not sure if you take any of the medicines listed above. This is not a complete list of all the medicines that can interact with Artrex (Colchicine).

• Know the medicines you take. Keep a list of them and show it to your healthcare provider and pharmacist when you get a new medicine.
• Keep Artrex (Colchicine) out of the reach of children.

What is Artrex (Colchicine)?

Artrex (Colchicine) is a prescription medicine used to:

• prevent and treat gout flares in adults
• treat familial Mediterranean fever (FMF) in adults and children age four or older

Artrex (Colchicine) is not a pain medicine and it should not be taken to treat pain related to other conditions unless specifically prescribed for those conditions.

Who should not take Artrex (Colchicine)?

Do not take Artrex (Colchicine) if you have liver or kidney problems and you take certain other medicines. Serious side effects, including death, have been reported in these patients even when taken as directed. See "What is the most important information I should know about Artrex (Colchicine)?"

What should I tell my healthcare provider before starting Artrex (Colchicine)?

See "What is the most important information I should know about Artrex (Colchicine)?"

Before you take Artrex (Colchicine) tell your healthcare provider about all your medical conditions including if you:

• have liver or kidney problems
• are pregnant or plan to become pregnant. It is not known if Artrex (Colchicine) will harm your unborn baby. Talk to your healthcare provider if you are pregnant or plan to become pregnant.
• are breast-feeding or plan to breast-feed. Artrex (Colchicine) passes into your breast milk. You and your healthcare provider should decide if you will take Artrex (Colchicine) or breast-feed. If you take Artrex (Colchicine) and breast-feed, you should talk to your child's healthcare provider about how to watch for side effects in your child.

Tell your healthcare provider about all the medicines you take, including ones that you may only be taking for a short time, such as antibiotics. See "What is the most important information I should know about Artrex (Colchicine)?" Do not start a new medicine without talking to your healthcare provider.

Using Artrex (Colchicine) with certain other medicines, such as cholesterol-lowering medications and digoxin, can affect each other causing serious side effects. Your healthcare provider may need to change your dose of Artrex (Colchicine). Talk to your healthcare provider about whether the medications you are taking might interact with Artrex (Colchicine), and what side effects to look for.

How should I take Artrex (Colchicine)?

• Take Artrex (Colchicine) exactly as your healthcare provider tells you to take it. If you are not sure about your dosing, call your healthcare provider.
• Artrex (Colchicine) can be taken with or without food.
• If you take too much Artrex (Colchicine) go to the nearest hospital emergency room right away.
• Do not stop taking Artrex (Colchicine) even if you start to feel better, unless your healthcare provider tells you.
• Your healthcare provider may do blood tests while you take Artrex (Colchicine).
• If you take Artrex (Colchicine) daily and you miss a dose, then take it as soon as you remember. If it is almost time for your next dose, just skip the missed dose. Take the next dose at your regular time. Do not take 2 doses at the same time.
• If you have a gout flare while taking Artrex (Colchicine) daily, report this to your healthcare provider.

What should I avoid while taking Artrex (Colchicine)?

• Avoid eating grapefruit or drinking grapefruit juice while taking Artrex (Colchicine). It can increase your chances of getting serious side effects.

What are the possible side effects of Artrex (Colchicine)?

Artrex (Colchicine) can cause serious side effects or even cause death. See "What is the most important information I should know about Artrex (Colchicine)?"

Get medical help right away, if you have:

• • Muscle weakness or pain
  • Numbness or tingling in your fingers or toes
  • Unusual bleeding or bruising
  • Increased infections
  • Feel weak or tired
  • Pale or gray color to your lips, tongue, or palms of your hands
  • Severe diarrhea or vomiting

Gout Flares: The most common side effect of Artrex (Colchicine) in people who have gout flares is diarrhea.

FMF: The most common side effects of Artrex (Colchicine) in people who have FMF are abdominal pain, diarrhea, nausea and vomiting.

Tell your healthcare provider if you have any side effect that bothers you or that does not go away.

These are not all of the possible side effects of Artrex (Colchicine). For more information, ask your healthcare provider or pharmacist.

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

How should I store Artrex (Colchicine)?

• Store Artrex (Colchicine) at room temperature between 68° and 77°F (20° to 25°C).
• Keep Artrex (Colchicine) in a tightly closed container.
• Keep Artrex (Colchicine) out of the light.

Keep Artrex (Colchicine) and all medicines out of the reach of children.

General Information about Artrex (Colchicine)

Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use Artrex (Colchicine) for a condition for which it was not prescribed. Do not give Artrex (Colchicine) to other people, even if they have the same symptoms that you have. It may harm them. This Medication Guide summarizes the most important information about Artrex (Colchicine). If you would like more information, talk with your healthcare provider. You can ask your healthcare provider or pharmacist for information about Artrex (Colchicine) that is written for healthcare professionals.

For more information, go to www. COLCRYS.com or call 1-888-351-3786.

What are the ingredients in Artrex (Colchicine)?

Active Ingredient: Artrex (Colchicine)

Inactive Ingredients: carnauba wax, FD&C blue #2, FD&C red #40, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, polydextrose, polyethylene glycol, pregelatinized starch, sodium starch glycolate, titanium dioxide, and triacetin.

This Medication Guide has been approved by the U.S. Food and Drug Administration.

Artrex (Colchicine)^® is a registered U.S. trademark of the URL Pharma, Inc. group of companies. © 2009 AR Holding Company, Inc., a URL Pharma, Inc. company

U.S. Patent Nos. 7,601,758; 7,619,004 and other patents pending

Manufactured for:

AR SCIENTIFIC, INC.

Philadelphia, PA 19124 USA

by:

MUTUAL PHARMACEUTICAL COMPANY, INC.

Rev 14, March 2012

PRINCIPAL DISPLAY PANEL - 0.6 mg Tablet Bottle Label

100 TABLETS

NDC 13310-119-01

Artrex (Colchicine)^®

(colchicine, USP) tablets

0.6 mg

PHARMACIST:

PLEASE DISPENSE WITH

MEDICATION GUIDE ATTACHED

AR

SCIENTIFIC

Rx only