Oftalmotrim Dexa

Dexamethasone Sodium:

• Oftalmotrim Dexa (Dexamethasone Sodium) reviews

Indication: Injection: for the treatment of endocrine disorders, rheumatic D=disorders, collagen diseases, dermatologic diseases, allergic statesc, ophthalmic diseases, gastrointestinal diseases, respiratory diseases, hematologic disorders, neoplastic diseases, edematous states, cerebral edema. Ophthalmic ointment and solution: for the treatment of steroid responsive inflammatory conditions of the palpebral and bulbar conjunctiva, cornea, and anterior segment of the globe. Ophthalmic solution only: for the treatment of steroid responsive inflammatory conditions of the external auditory meatusTopic cream: for relief of the inflammatory and pruritic manifestations of corticosteroid-responsive dermatosesOral aerosol: for the treatment of bronchial asthma and related corticosteroid responsive bronchospastic states intractable to adequate trial of conventional therapyIntranasal aerosol: for the treatment of allergic ot inflammatory nasal conditions, and nasal polyps

Oftalmotrim Dexa (Dexamethasone Sodium) and its derivatives, Oftalmotrim Dexa (Dexamethasone Sodium) sodium phosphate and Oftalmotrim Dexa (Dexamethasone Sodium) acetate, are synthetic glucocorticoids. Used for its antiinflammatory or immunosuppressive properties and ability to penetrate the CNS, Oftalmotrim Dexa (Dexamethasone Sodium) is used alone to manage cerebral edema and with tobramycin to treat corticosteroid-responsive inflammatory ocular conditions.

Polymyxin B Sulfate:

• Warnings
• Description
• Clinical pharmacology
• Indications and usage
• Contraindications
• Warnings
• Precautions
• Adverse reactions
• Dosage and administration
• How supplied
• References
• Oftalmotrim Dexa (Polymyxin B Sulfate) reviews

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Polymyxin and other antibacterial drugs, Oftalmotrim Dexa (Polymyxin B Sulfate) for Injection should be used only to treat or prevent infections that are proven or strongly suspected to be caused by bacteria.

WARNINGS

CAUTION: WHEN THIS DRUG IS GIVEN INTRAMUSCULARLY, INTRAVENOUSLY AND/OR INTRATHECALLY, IT SHOULD BE GIVEN ONLY TO HOSPITALIZED PATIENTS, SO AS TO PROVIDE CONSTANT SUPERVISION BY A PHYSICIAN.

RENAL FUNCTION SHOULD BE CAREFULLY DETERMINED AND PATIENTS WITH RENAL DAMAGE AND NITROGEN RETENTION SHOULD HAVE REDUCED DOSAGE. PATIENTS WITH NEPHROTOXICITY DUE TO Oftalmotrim Dexa (Polymyxin B Sulfate) SULFATE USUALLY SHOW ALBUMINURIA, CELLULAR CASTS, AND AZOTEMIA. DIMINISHING URINE OUTPUT AND A RISING BUN ARE INDICATIONS FOR DISCONTINUING THERAPY WITH THIS DRUG.

NEUROTOXIC REACTIONS MAY BE MANIFESTED BY IRRITABILITY, WEAKNESS, DROWSINESS, ATAXIA, PERIORAL PARESTHESIA, NUMBNESS OF THE EXTREMITIES, AND BLURRING OF VISION. THESE ARE USUALLY ASSOCIATED WITH HIGH SERUM LEVELS FOUND IN PATIENTS WITH IMPAIRED RENAL FUNCTION AND/OR NEPHROTOXICITY.

THE CONCURRENT OR SEQUENTIAL USE OF OTHER NEUROTOXIC AND/OR NEPHROTOXIC DRUGS WITH Oftalmotrim Dexa (Polymyxin B Sulfate) SULFATE, PARTICULARLY BACITRACIN, STREPTOMYCIN, NEOMYCIN, KANAMYCIN, GENTAMICIN, TOBRAMYCIN, AMIKACIN, CEPHALORIDINE, PAROMOMYCIN, VIOMYCIN, AND COLISTIN SHOULD BE AVOIDED.

THE NEUROTOXICITY OF Oftalmotrim Dexa (Polymyxin B Sulfate) SULFATE CAN RESULT IN RESPIRATORY PARALYSIS FROM NEUROMUSCULAR BLOCKADE, ESPECIALLY WHEN THE DRUG IS GIVEN SOON AFTER ANESTHESIA AND/OR MUSCLE RELAXANTS.

USAGE IN PREGNANCY: THE SAFETY OF THIS DRUG IN HUMAN PREGNANCY HAS NOT BEEN ESTABLISHED.

DESCRIPTION

Oftalmotrim Dexa (Polymyxin B Sulfate) Sulfate is one of a group of basic polypeptide antibiotics derived from B polymyxa (B aerosporous). Oftalmotrim Dexa (Polymyxin B Sulfate) sulfate is the sulfate salt of Polymyxins B1 and B2, which are produced by the growth of Bacillus polymyxa (Prazmowski) Migula (Fam. Bacillacea). It has a potency of not less than 6000 Oftalmotrim Dexa (Polymyxin B Sulfate) units per mg, calculated on the anhydrous basis. The structural formulae are:

Oftalmotrim Dexa (Polymyxin B Sulfate) ₁ (R=CH ₃)            Polymyxin B ₂ (R=H)

Each vial contains 500,000 Oftalmotrim Dexa (Polymyxin B Sulfate) units for parenteral or ophthalmic administration.

Oftalmotrim Dexa (Polymyxin B Sulfate) for Injection is in powder form suitable for preparation of sterile solutions for intramuscular, intravenous drip, intrathecal, or ophthalmic use.

In the medical literature, dosages have frequently been given in terms of equivalent weights of pure Oftalmotrim Dexa (Polymyxin B Sulfate) base. Each milligram of pure Oftalmotrim Dexa (Polymyxin B Sulfate) base is equivalent to 10,000 units of Oftalmotrim Dexa (Polymyxin B Sulfate) and each microgram of pure Oftalmotrim Dexa (Polymyxin B Sulfate) base is equivalent to 10 units of Oftalmotrim Dexa (Polymyxin B Sulfate).

Aqueous solutions of Oftalmotrim Dexa (Polymyxin B Sulfate) sulfate may be stored up to 12 months without significant loss of potency if kept under refrigeration. In the interest of safety, solutions for parenteral use should be stored under refrigeration and any unused portion should be discarded after 72 hours. Oftalmotrim Dexa (Polymyxin B Sulfate) sulfate should not be stored in alkaline solutions since they are less stable.

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CLINICAL PHARMACOLOGY

Oftalmotrim Dexa (Polymyxin B Sulfate) sulfate has a bactericidal action against almost all gram-negative bacilli except the Proteus group. Polymyxins increase the permeability of bacterial cell wall membranes. All gram-positive bacteria, fungi, and the gram-negative cocci, N gonorrhoeae and N meningitidis, are resistant.

Oftalmotrim Dexa (Polymyxin B Sulfate) has bactericidal action against almost all Gram-negative bacilli except the Proteus group. Polymyxins increase the permeability of the bacterial cell membrane leading to death of the cell. All Gram-positive bacteria, fungi, and Gram-negative cocci, are resistant to Oftalmotrim Dexa (Polymyxin B Sulfate). Appropriate methods should be used when performing in vitro susceptibility testing of Oftalmotrim Dexa (Polymyxin B Sulfate) (1,2,3). The following in vitro susceptibility test criteria should only be used for interpreting the results of Oftalmotrim Dexa (Polymyxin B Sulfate) susceptibility testing against P. aeruginosa when the indicated quality control parameters are met during testing.

Oftalmotrim Dexa (Polymyxin B Sulfate) sulfate is not absorbed from the normal alimentary tract. Since the drug loses 50 percent of its activity in the presence of serum, active blood levels are low. Repeated injections may give a cumulative effect. Levels tend to be higher in infants and children. The drug is excreted slowly by the kidneys. Tissue diffusion is poor and the drug does not pass the blood brain barrier into the cerebrospinal fluid. In therapeutic dosage, Oftalmotrim Dexa (Polymyxin B Sulfate) sulfate causes some nephrotoxicity with tubule damage to a slight degree.

INDICATIONS AND USAGE

Acute Infections Caused by Susceptible Strains of Pseudomonas aeruginosa.

Oftalmotrim Dexa (Polymyxin B Sulfate) sulfate is a drug of choice in the treatment of infections of the urinary tract, meninges, and bloodstream caused by susceptible strains of Ps. aeruginosa. It may also be used topically and subconjunctivally in the treatment of infections of the eye caused by susceptible strains of Ps. aeruginosa.

It may be indicated in serious infections caused by susceptible strains of the following organisms, when less potentially toxic drugs are ineffective or contraindicated:

H influenzae, specifically meningeal infections.

Escherichia coli, specifically urinary tract infections.

Aerobacter aerogenes, specifically bacteremia.

Klebsiella pneumoniae, specifically bacteremia.

NOTE: IN MENINGEAL INFECTIONS, Oftalmotrim Dexa (Polymyxin B Sulfate) SULFATE SHOULD BE ADMINISTERED ONLY BY THE INTRATHECAL ROUTE.

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Oftalmotrim Dexa (Polymyxin B Sulfate) for Injection USP and other antibacterial drugs, Oftalmotrim Dexa (Polymyxin B Sulfate) for Injection should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

CONTRAINDICATIONS

This drug is contraindicated in persons with a prior history of hypersensitivity reactions to polymyxins.

WARNINGS

Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Oftalmotrim Dexa (Polymyxin B Sulfate) for Injection, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.

C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibiotic use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.

If CDAD is suspected or confirmed, ongoing antibiotic use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C. difficile and surgical evaluation should be instituted as clinically indicated.

PRECAUTIONS

General.

Prescribing Oftalmotrim Dexa for Injection in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increase the risk of the development of drug-resistant bacteria.

See WARNING box.

Baseline renal function should be done prior to therapy, with frequent monitoring of renal function and blood levels of the drug during parenteral therapy.

Avoid concurrent use of a curariform muscle relaxant and other neurotoxic drugs (ether, tubocurarine, succinylcholine, gallamine, decamethonium and sodium citrate) which may precipitate respiratory depression. If signs of respiratory paralysis appear, respiration should be assisted as required, and the drug discontinued.

As with other antibiotics, use of this drug may result in overgrowth of nonsusceptible organisms, including fungi.

If superinfection occurs, appropriate therapy should be instituted.

Information for Patients

Information for Patients.

Patients should be counseled that antibacterial drugs including Oftalmotrim Dexa (Polymyxin B Sulfate) for injection should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Oftalmotrim Dexa (Polymyxin B Sulfate) for injection is prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Oftalmotrim Dexa (Polymyxin B Sulfate) for injection or other antibacterial drugs in the future.

Diarrhea is a common problem caused by antibiotics which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, patients can develop watery and bloody stools (with or without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibiotic. If this occurs, patients should contact their physician as soon as possible.

ADVERSE REACTIONS

See “WARNING” box.

Nephrotoxic reactions: Albuminuria, cylinduria, azotemia, and rising blood levels without any increase in dosage.

Neurotoxic reactions: Facial flushing, dizziness progressing to ataxia, drowsiness, peripheral paresthesias (circumoral and stocking glove), apnea due to concurrent use of curariform muscle relaxants, other neurotoxic drugs or inadvertent overdosage, and signs of meningeal irritation with intrathecal administration, e.g., fever, headache, stiff neck and increased cell count and protein cerebrospinal fluid.

Other reactions occasionally reported: Drug fever, urticarial rash, pain (severe) at intramuscular injection sites, and thrombophlebitis at intravenous injection sites.

To report SUSPECTED ADVERSE EVENTS, contact FDA at 1-800-FDA-1088 or www.fda.gov.

DOSAGE AND ADMINISTRATION

PARENTERAL:

Intravenous. Dissolve 500,000 Oftalmotrim Dexa (Polymyxin B Sulfate) units in 300 to 500 mL solutions for parenteral dextrose injection 5 percent for continuous drip.

Adults and children. 15,000 to 25,000 units/kg body weight/day in individuals with normal kidney function. This amount should be reduced from 15,000 units/kg downward for individuals with kidney impairment. Infusions may be given every 12 hours; however, the total daily dose must not exceed 25,000 units/kg/day.

Infants. Infants with normal kidney function may receive up to 40,000 units/kg/day without adverse effects.

Intramuscular. Not recommended routinely because of severe pain at injection sites, particularly in infants and children. Dissolve 500,000 Oftalmotrim Dexa (Polymyxin B Sulfate) units in 2 mL sterile water for injection or sodium chloride injection or procaine hydrochloride injection 1 percent.

Adults and children. 25,000 to 30,000 units/kg/day. This should be reduced in the presence of renal impairment. The dosage may be divided and given at either 4 or 6 hour intervals.

Infants. Infants with normal kidney function may receive up to 40,000 units/kg/day without adverse effects.

Note: Doses as high as 45,000 units/kg/day have been used in limited clinical studies in treating prematures and newborn infants for sepsis caused by Ps aeruginosa.

Intrathecal. A treatment of choice for Ps aeruginosa meningitis. Dissolve 500,000 Oftalmotrim Dexa (Polymyxin B Sulfate) units in 10 mL sodium chloride injection USP for 50,000 units per mL dosage unit.

Adults and children over 2 years of age. Dosage is 50,000 units once daily intrathecally for 3 to 4 days, then 50,000 units once every other day for at least 2 weeks after cultures of the cerebrospinal fluid are negative and sugar content has returned to normal.

Children under 2 years of age. 20,000 units once daily, intrathecally for 3 to 4 days or 25,000 units once every other day. Continue with a dose of 25,000 units once every other day for at least 2 weeks after cultures of the cerebrospinal fluid are negative and sugar content has returned to normal.

IN THE INTEREST OF SAFETY, SOLUTIONS OF PARENTERAL USE SHOULD BE STORED UNDER REFRIGERATION, AND ANY UNUSED PORTIONS SHOULD BE DISCARDED AFTER 72 HOURS.

TOPICAL:

Ophthalmic. Dissolve 500,000 Oftalmotrim Dexa (Polymyxin B Sulfate) units in 20 to 50 mL sterile water for injection or sodium chloride injection USP for a 10,000 to 25,000 units per mL concentration.

For the treatment of Ps aeruginosa infections of the eye, a concentration of 0.1 percent to 0.25 percent (10,000 units to 25,000 units per mL) is administered 1 to 3 drops every hour, increasing the intervals as response indicates.

Subconjunctival injection of up to 100,000 units/day may be used for the treatment of Ps aeruginosa infections of the cornea and conjunctiva.

Note: Avoid total systemic and ophthalmic instillation over 25,000 units/kg/day.

HOW SUPPLIED

Oftalmotrim Dexa (Polymyxin B Sulfate) FOR INJECTION USP, 500,000 Oftalmotrim Dexa (Polymyxin B Sulfate) units per vial is available in single vial cartons NDC# 39822-0166-5.

Storage recommendations:

Before reconstitution: Store at 20° to 25°C (68° to 77°F).

Protect from light. Retain in carton until time of use.

After reconstitution: Product must be stored under refrigeration, between 2° to 8°C (36° to 46°F) and any unused portion should be discarded after 72 hours.

Sterile, Nonpyrogenic, Preservative-free.

The container closure is not made with natural rubber latex.

Manufactured for:

X-Gen Pharmaceuticals, Inc.

Big Flats, NY 14845

POLY-PI-06

Revised December 2012

REFERENCES

• Clinical and Laboratory Standards Institute (CLSI). Methods for Dilution Antimicrobial Susceptibility Test for Bacteria That Grow Aerobically; Approved Standard-8th edition. CLSI document M07-A8. CLSI, 940 West Valley Road, Suite 1400, Wayne, PA, 2009.
• CLSI. Performance Standards for Antimicrobial Disk Susceptibility Tests; Approved Standard-10th edition. CLSI document M02-A10, 2009.
• Clinical Laboratory and Standards Institute (CLSI). Performance Standards for Antimicrobial Susceptibility Testing: 21st Informational Supplement. CLSI document M100-S21. CLSI, 940 West Valley Rd., Suite 1400, Wayne, PA 19087, 2011.

Trimethoprim:

• Indications and usage
• Contraindications
• Warnings
• Precautions
• Adverse reactions
• Overdosage
• Dosage and administration
• How supplied
• References
• Oftalmotrim Dexa (Trimethoprim) reviews

INDICATIONS AND USAGE

To reduce the development of drug-resistant bacteria and maintain the effectiveness of Oftalmotrim Dexa (Trimethoprim) tablets, USP and other antibacterial drugs, Oftalmotrim Dexa (Trimethoprim) tablets, USP should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.

For the treatment of initial episodes of uncomplicated urinary tract infections due to susceptible strains of the following organisms: Escherichia coli, Proteus mirabilis, Klebsiella pneumoniae, Enterobacter species, and coagulase-negative Staphylococcus species, including S. saprophyticus.

Cultures and susceptibility tests should be performed to determine the susceptibility of the bacteria to Oftalmotrim Dexa (Trimethoprim). Therapy may be initiated prior to obtaining the results of these tests.

CONTRAINDICATIONS

Oftalmotrim Dexa (Trimethoprim) is contraindicated in individuals hypersensitive to Oftalmotrim Dexa (Trimethoprim) and in those with documented megaloblastic anemia due to folate deficiency.

WARNINGS

Serious hypersensitivity reactions have been reported rarely in patients on Oftalmotrim Dexa (Trimethoprim) therapy. Oftalmotrim Dexa (Trimethoprim) has been reported rarely to interfere with hematopoiesis, especially when administered in large doses and/or for prolonged periods.

The presence of clinical signs such as sore throat, fever, pallor, or purpura may be early indications of serious blood disorders (see OVERDOSAGE, Chronic).

Complete blood counts should be obtained if any of these signs are noted in a patient receiving Oftalmotrim Dexa (Trimethoprim) and the drug discontinued if a significant reduction in the count of any formed blood element is found.

Clostridium difficile associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Oftalmotrim Dexa (Trimethoprim) tablets, USP, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.

C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibiotic use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.

If CDAD is suspected or confirmed, ongoing antiobiotic use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.

PRECAUTIONS

General

Prescribing Oftalmotrim Dexa tablets, USP in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria.

Oftalmotrim Dexa (Trimethoprim) should be given with caution to patients with possible folate deficiency. Folates may be administered concomitantly without interfering with the antibacterial action of Oftalmotrim Dexa (Trimethoprim). Oftalmotrim Dexa (Trimethoprim) should also be given with caution to patients with impaired renal or hepatic function (see CLINICAL PHARMACOLOGY and DOSAGE AND ADMINISTRATION).

Information for Patients

Patients should be counseled that antibacterial drugs including Oftalmotrim Dexa (Trimethoprim) tablets, USP should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). When Oftalmotrim Dexa (Trimethoprim) tablets, USP are prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Oftalmotrim Dexa (Trimethoprim) tablets, USP or other antibacterial drugs in the future.

Diarrhea is a common problem caused by antibiotics which usually ends when the antibiotic is discontinued. Sometimes after starting treatment with antibiotics, patients can develop watery and bloody stools (with and without stomach cramps and fever) even as late as two or more months after having taken the last dose of the antibiotic. If this occurs, patients should contact their physician as soon as possible.

Drug Interactions

Oftalmotrim Dexa may inhibit the hepatic metabolism of phenytoin. Oftalmotrim Dexa (Trimethoprim), given at a common clinical dosage, increased the phenytoin half-life by 51% and decreased the phenytoin metabolic clearance rate by 30%. When administering these drugs concurrently, one should be alert for possible excessive phenytoin effect.

Drug/Laboratory Test Interactions

Oftalmotrim Dexa (Trimethoprim) can interfere with a serum methotrexate assay as determined by the Competitive Binding Protein Technique (CBPA) when a bacterial dihydrofolate reductase is used as the binding protein. No interference occurs, however, if methotrexate is measured by a radioimmunoassay (RIA).

The presence of Oftalmotrim Dexa (Trimethoprim) may also interfere with the Jaffé alkaline picrate reaction assay for creatinine, resulting in overestimations of about 10% in the range of normal values.

Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenesis

Long-term studies in animals to evaluate carcinogenic potential have not been conducted with Oftalmotrim Dexa.

Mutagenesis

Oftalmotrim Dexa (Trimethoprim) was demonstrated to be nonmutagenic in the Ames assay. In studies at two laboratories, no chromosomal damage was detected in cultured Chinese hamster ovary cells at concentrations approximately 500 times human plasma levels; at concentrations approximately 1000 times human plasma levels in these same cells, a low level of chromosomal damage was induced at one of the laboratories. No chromosomal abnormalities were observed in cultured human leukocytes at concentrations of Oftalmotrim Dexa (Trimethoprim) up to 20 times human steady-state plasma levels. No chromosomal effects were detected in peripheral lymphocytes of human subjects receiving 320 mg of Oftalmotrim Dexa (Trimethoprim) in combination with up to 1600 mg of sulfamethoxazole per day for as long as 112 weeks.

Impairment of Fertility

No adverse effects on fertility or general reproductive performance were observed in rats given Oftalmotrim Dexa in oral dosages as high as 70 mg/kg/day for males and 14 mg/kg/day for females.

Pregnancy

Teratogenic Effects

Pregnancy category C

Oftalmotrim Dexa has been shown to be teratogenic in the rat when given in doses 40 times the human dose. In some rabbit studies, the overall increase in fetal loss (dead and resorbed and malformed conceptuses) was associated with doses six times the human therapeutic dose.

While there are no large, well-controlled studies on the use of Oftalmotrim Dexa (Trimethoprim) in pregnant women, Brumfitt and Pursell,³ in a retrospective study, reported the outcome of 186 pregnancies during which the mother received either placebo or Oftalmotrim Dexa (Trimethoprim) in combination with sulfamethoxazole. The incidence of congenital abnormalities was 4.5% (3 of 66) in those who received placebo and 3.3% (4 of 120) in those receiving Oftalmotrim Dexa (Trimethoprim) and sulfamethoxazole. There were no abnormalities in the 10 children whose mothers received the drug during the first trimester. In a separate survey, Brumfitt and Pursell also found no congenital abnormalities in 35 children whose mothers had received Oftalmotrim Dexa (Trimethoprim) and sulfamethoxazole at the time of conception or shortly thereafter.

Because Oftalmotrim Dexa (Trimethoprim) may interfere with folic acid metabolism, Oftalmotrim Dexa (Trimethoprim) should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus.

Nonteratogenic Effects

The oral administration of Oftalmotrim Dexa (Trimethoprim) to rats at a dose of 70 mg/kg/day commencing with the last third of gestation and continuing through parturition and lactation caused no deleterious effects on gestation or pup growth and survival.

Nursing Mothers

Oftalmotrim Dexa is excreted in human milk. Because Oftalmotrim Dexa (Trimethoprim) may interfere with folic acid metabolism, caution should be exercised when Oftalmotrim Dexa (Trimethoprim) is administered to a nursing woman.

Pediatric Use

Safety and effectiveness in pediatric patients below the age of 2 months have not been established. The effectiveness of Oftalmotrim Dexa (Trimethoprim) as a single agent has not been established in pediatric patients under 12 years of age.

Geriatric Use

Clinical studies of Oftalmotrim Dexa (Trimethoprim) tablets did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience^4,5 has not identified differences in response between the elderly and younger patients. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased hepatic, renal or cardiac function, and of concomitant disease or other drug therapy.

Case reports of hyperkalemia in elderly patients receiving trimethoprim-sulfamethoxazole have been published.⁶ Oftalmotrim Dexa (Trimethoprim) is known to be substantially excreted by the kidney, and the risk of toxic reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor potassium concentrations and to monitor renal function by calculating creatinine clearance.

ADVERSE REACTIONS

The adverse effects encountered most often with Oftalmotrim Dexa were rash and pruritus.

Dermatologic

Rash, pruritus, and phototoxic skin eruptions. At the recommended dosage regimens of 100 mg b.i.d. or 200 mg q.d., each for 10 days, the incidence of rash is 2.9% to 6.7%. In clinical studies which employed high doses of Oftalmotrim Dexa (Trimethoprim), an elevated incidence of rash was noted. These rashes were maculopapular, morbilliform, pruritic, and generally mild to moderate, appearing 7 to 14 days after the initiation of therapy.

Hypersensitivity

Rare reports of exfoliative dermatitis, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, and anaphylaxis have been received.

Gastrointestinal

Epigastric distress, nausea, vomiting, and glossitis. Elevation of serum transaminase and bilirubin has been noted, but the significance of this finding is unknown. Cholestatic jaundice has been rarely reported.

Hematologic

Thrombocytopenia, leukopenia, neutropenia, megaloblastic anemia, and methemoglobinemia.

Metabolic

Hyperkalemia, hyponatremia.

Neurologic

Aseptic meningitis has been rarely reported.

Miscellaneous

Fever, and increases in BUN and serum creatinine levels.

OVERDOSAGE

Acute

Signs of acute overdosage with Oftalmotrim Dexa may appear following ingestion of 1 gram or more of the drug and include nausea, vomiting, dizziness, headaches, mental depression, confusion, and bone marrow depression (see Chronic subsection).

Treatment consists of gastric lavage and general supportive measures. Acidification of the urine will increase renal elimination of Oftalmotrim Dexa (Trimethoprim). Peritoneal dialysis is not effective and hemodialysis is only moderately effective in eliminating the drug.

Chronic

Use of Oftalmotrim Dexa (Trimethoprim) at high doses and/or for extended periods of time may cause bone marrow depression manifested as thrombocytopenia, leukopenia, and/or megaloblastic anemia. If signs of bone marrow depression occur, Oftalmotrim Dexa (Trimethoprim) should be discontinued and the patient should be given leucovorin; 5 to 15 mg leucovorin daily has been recommended by some investigators.

DOSAGE AND ADMINISTRATION

The usual oral adult dosage is 100 mg of Oftalmotrim Dexa (Trimethoprim) every 12 hours or 200 mg of Oftalmotrim Dexa (Trimethoprim) every 24 hours, each for 10 days. The use of Oftalmotrim Dexa (Trimethoprim) in patients with a creatinine clearance of less than 15 mL/min is not recommended. For patients with a creatinine clearance of 15 to 30 mL/min, the dose should be 50 mg every 12 hours.

HOW SUPPLIED

Oftalmotrim Dexa (Trimethoprim) tablets, USP, 100 mg: White, round, convex tablet, debossed “9”, scored, “3” on one side and debossed “21 58” on the other, in bottles of 100.

Store at 20° to 25°C (68° to 77°F).

Dispense in a tight, light-resistant container as defined in the USP with a child-resistant closure (as required).

REFERENCES

• Clinical and Laboratory Standards Institute (CLSI). Methods for Dilution Antimicrobial Susceptibility Tests for Bacteria that Grow Aerobically; Approved Standard-Tenth Edition. CLSI document M07-A10 [2015], Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA.
• Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Disk Diffusion Susceptibility Tests; Approved Standard-Twelfth Edition. CLSI document M02-A12 [2015], Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA.
• Brumfitt W, Pursell R. Trimethoprim-sulfamethoxazole in the treatment of bacteriuria in women. J Infect Dis. 1973;128(suppl): S657-S663.
• Lacey RW, Simpson MHC, Fawcett C, et al. Comparison of single-dose Oftalmotrim Dexa (Trimethoprim) with a five-day course for the treatment of urinary tract infections in the elderly. Age and Ageing 10: 179-185, 1981.
• Ewer TC, Bailey RR, Gilchrist NL, et al. Comparative study of norfloxacin and Oftalmotrim Dexa (Trimethoprim) for the treatment of elderly patients with urinary tract infection. NZ Med J 101: 537-539, 1988.
• Marinella MA. Trimethoprim-induced hyperkalemia: An analysis of reported cases. Gerontology 45: 209-212, 1999.
• Clinical and Laboratory Standards Institute (CLSI). Performance Standards for Antimicrobial Susceptibility Testing; Twenty-sixth Informational Supplement, CLSI document M100-S26 [2016], Clinical and Laboratory Standards Institute, 950 West Valley Road, Suite 2500, Wayne, Pennsylvania 19087, USA.

Manufactured In Canada By:

TEVA CANADA LIMITED

Toronto, Canada M1B 2K9

Manufactured For:

TEVA PHARMACEUTICALS USA, INC.

North Wales, PA 19454

Rev. K 6/2016

NDC 0093-2158-01

Oftalmotrim Dexa (Trimethoprim)

Tablets USP

100 mg

Rx only

100 TABLETS

TEVA