Regurin

Regurin uses

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

1 INDICATIONS AND USAGE

Regurin tablets USP are a muscarinic antagonist indicated for the treatment of overactive bladder (OAB) with symptoms of urge urinary incontinence, urgency, and urinary frequency.

Regurin tablets USP are a muscarinic antagonist indicated for the treatment of overactive bladder (OAB) with symptoms of urge urinary incontinence, urgency, and urinary frequency. (1)

2 DOSAGE AND ADMINISTRATION

The recommended dose is 20 mg twice daily. Regurin tablets USP should be dosed at least one hour before meals or given on an empty stomach.

Dosage modification is recommended in the following patient populations:

• For patients with severe renal impairment (creatinine clearance less than 30 mL/min), the recommended dose is 20 mg once daily at bedtime [see Warnings and Precautions (5.5), Use in Specific Populations (8.6), and Clinical Pharmacology (12.3)].
• In geriatric patients greater than or equal to 75 years of age, dose may be titrated down to 20 mg once daily based upon tolerability [see Use in Specific Populations (8.5)].

• The recommended dose of Regurin tablets USP is one 20 mg tablet twice daily. Regurin tablets USP should be dosed with water on an empty stomach, at least one hour before a meal. (2)
• For patients with severe renal impairment (creatinine clearance less than 30 mL/min), the recommended dose is 20 mg once daily at bedtime. (2)
• In geriatric patients greater than or equal to 75 years of age, dose may be titrated down to 20 mg once daily based upon tolerability. (2)

3 DOSAGE FORMS AND STRENGTHS

Regurin tablets USP are supplied as 20 mg tablets (brownish yellow, round, biconvex film-coated tablets, debossed with ‘L’ on one side and ‘1’ on other side).

• 20 mg tablets. (3)

4 CONTRAINDICATIONS

Regurin^{is contraindicated in patients with:}

• urinary retention
• gastric retention
• uncontrolled narrow-angle glaucoma.
• known hypersensitivity to the drug or its ingredients. Angioedema, rash and anaphylactic reaction have been reported.

Regurin is contraindicated in

• patients with urinary retention, gastric retention, or uncontrolled narrow-angle glaucoma, and in patients who are at risk for these conditions (4)
• patients with known hypersensitivity (4)

5 WARNINGS AND PRECAUTIONS

• Regurin should be administered with caution to patients with clinically significant bladder outflow obstruction or gastrointestinal obstructive disorders due to risk of urinary or gastric retention.
• Angioedema of the face, lips, tongue and/or larynx has been reported with Regurin. (5.2)
• In patients with controlled narrow angle glaucoma Regurin should be used only with careful monitoring. (5.4)
• Central Nervous System Effects: Somnolence has been reported with Regurin. Advise patients not to drive or operate heavy machinery until they know how Regurin affects them (5.5).
• Trospium is substantially excreted by the kidney. The effects of moderate renal impairment on systemic exposure are not known but systemic exposure is likely increased. Therefore, the risk of anticholinergic adverse reactions is expected to be greater in patients with moderate renal impairment. (5.6)

5.1 Risk of Urinary Retention

Regurin should be administered with caution to patients with clinically significant bladder outflow obstruction because of the risk of urinary retention [see Contraindications (4)].

5.2 Angioedema

Angioedema of the face, lips, tongue, and/or larynx has been reported with Regurin, the active ingredient in Regurin. In one case, angioedema occurred after the first dose of Regurin. Angioedema associated with upper airway swelling may be life threatening. If involvement of the tongue, hypopharynx, or larynx occurs, Regurin should be promptly discontinued and appropriate therapy and/or measures necessary to ensure a patent airway should be promptly provided.

5.3 Decreased Gastrointestinal Motility

Regurin should be administered with caution to patients with gastrointestinal obstructive disorders because of the risk of gastric retention [see Contraindications ]. Regurin, like other antimuscarinic agents, may decrease gastrointestinal motility and should be used with caution in patients with conditions such as ulcerative colitis, intestinal atony and myasthenia gravis.

5.4 Controlled Narrow-angle Glaucoma

In patients being treated for narrow-angle glaucoma, Regurin^{should only be used if the potential benefits outweigh the risks and in that circumstance only with careful monitoring [see Contraindications (4)].}

5.5 Central Nervous System Effects

Regurin is associated with anticholinergic central nervous system effects . A variety of CNS anticholinergic effects have been reported, including dizziness, confusion, hallucinations and somnolence. Patients should be monitored for signs of anticholinergic CNS effects, particularly after beginning treatment or increasing the dose. Advise patients not to drive or operate heavy machinery until they know how Regurin affects them. If a patient experiences anticholinergic CNS effects, dose reduction or drug discontinuation should be considered.

5.6 Anticholinergic Adverse Reactions in Patients with Moderate Renal Impairment

Trospium is substantially excreted by the kidney. The effects of moderate renal impairment on systemic exposure are not known but systemic exposure is likely increased. Therefore, anticholinergic adverse reactions (including dry mouth, constipation, dyspepsia, urinary tract infection, and urinary retention) are expected to be greater in patients with moderate renal impairment [see Dosage and Administration (2), and Use in Specific Populations (8.6)].

6 ADVERSE REACTIONS

The most common adverse reactions with Regurin are dry mouth (20.1%), constipation (9.6%), and headache (4.2%). (6.1)

To report SUSPECTED ADVERSE REACTIONS, contact Glenmark Pharmaceuticals Inc., USA at 1(888) 721-7115 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.

6.1 Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, the adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in clinical practice.

The safety of Regurin was evaluated in controlled clinical trials in a total of 2975 patients, who were treated with Regurin (N=1673), placebo (N=1056) or active control medications (N=246). Of this total, 1181 patients participated in two, 12-week, U.S., efficacy and safety studies and a 9-month open-label extension. Of this total, 591 patients received Regurin tablets 20 mg twice daily. In all controlled trials combined, 232 and 208 patients received treatment with Regurin for at least 24 and 52 weeks, respectively.

In all placebo-controlled trials combined, the incidence of serious adverse events was 2.9% among patients receiving Regurin tablets 20 mg twice daily and 1.5% among patients receiving placebo. Table 1 lists adverse reactions from the combined 12-week U.S. safety and efficacy trials were reported by at least 1% of patients, and were reported more frequently in the Regurin group than in the placebo group.

The two most common adverse reactions reported by patients receiving Regurin tablets 20 mg twice daily were dry mouth and constipation. The single most frequently reported adverse reaction for Regurin, dry mouth, occurred in 20.1% of Regurin treated patients and 5.8% of patients receiving placebo. In the two U.S. studies, dry mouth led to discontinuation in 1.9% of patients treated with Regurin tablets 20 mg twice daily. For the patients who reported dry mouth, most had their first occurrence of the event within the first month of treatment.

Table 1. Incidence (%) of adverse reactions with Regurin, reported in greater than or equal to 1% of all patients treated with Regurin and more frequent with Regurin tablets (20 mg twice daily) than placebo in Studies 1 and 2 combined

Other adverse reactions from the U.S., placebo-controlled trials, occurring in greater than or equal to 0.5% and less than 1.0% of Regurin treated patients, and more common with Regurin than placebo are: tachycardia, vision blurred, abdominal distension, vomiting, dysgeusia, dry throat, and dry skin.

During controlled clinical studies, one adverse reaction of angioneurotic edema was reported.

6.2 Post-marketing Experience

The following adverse reactions have been identified during post-approval use of Regurin. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Gastrointestinal – gastritis; Cardiovascular – palpitations, supraventricular tachycardia, chest pain, syncope, “hypertensive crisis”; Immunological – Stevens-Johnson syndrome, anaphylactic reaction, angioedema; Nervous System – dizziness, confusion, vision abnormal, hallucinations, somnolence and delirium; Musculoskeletal – rhabdomyolysis; General – rash.

7 DRUG INTERACTIONS

• Concomitant use with digoxin did not affect the pharmacokinetics of either drug.
• Some drugs which are actively secreted by the kidney may interact with Regurin by competing for renal tubular secretion. (7.2)
• Concomitant use with metformin immediate release tablets reduced exposure and peak concentration of trospium. (7.4)

7.1 Digoxin

Concomitant use of Regurin and digoxin did not affect the pharmacokinetics of either drug [see Clinical Pharmacology (12.3)].

7.2 Drugs Eliminated by Active Tubular Secretion

Although demonstrated in a drug-drug interaction study not to affect the pharmacokinetics of digoxin, Regurin has the potential for pharmacokinetic interactions with other drugs that are eliminated by active tubular secretion. Coadministration of Regurin with these drugs may increase the serum concentration of Regurin and/or the coadministered drug due to competition for this elimination pathway. Careful patient monitoring is recommended in patients receiving such drugs [see Clinical Pharmacology (12.3)].

7.3 Antimuscarinic Agents

The concomitant use of Regurin with other antimuscarinic agents that produce dry mouth, constipation, and other anticholinergic pharmacological effects may increase the frequency and/or severity of such effects. Regurin may potentially alter the absorption of some concomitantly administered drugs due to anticholinergic effects on gastrointestinal motility.

7.4 Metformin

Co-administration of 500 mg metformin immediate release tablets twice daily with Regurin 60 mg extended release reduced the steady-state systemic exposure of trospium by approximately 29% for mean AUC_0-24 and by 34% for mean C_max [see Clinical Pharmacology (12.3)].

8 USE IN SPECIFIC POPULATIONS

• The safety and effectiveness of Regurin in pediatric patients have not been established.

8.1 Pregnancy

Teratogenic Effects

Pregnancy Category C: There are no adequate and well-controlled studies of Regurin in pregnant women. Regurin should be used during pregnancy only if the potential benefit to the patient outweighs the risk to the patient and fetus. Women who become pregnant during Regurin treatment are encouraged to contact their physician.

Risk Summary

Based on animal data, Regurin is predicted to have a low probability of increased risk of adverse developmental outcomes, above background risk. Adverse developmental findings were not observed to correlate with dose in rats or in rabbits. No increased risk above background was observed in rats and rabbits treated at an exposure approximately equivalent to the maximal recommended human dose of 40 mg.

Animal Data

In a rat embryo/fetal development study, pregnant rats received doses of Regurin up to 200 mg/kg/day, from implantation to closure of the fetal hard palate, with maternal systemic exposures corresponding to approximately nine times the exposure of women treated at the MRHD of 40 mg, based on AUC. No malformations or fetal toxicity were observed.

The offspring of female rats exposed orally, pre-and post-natally, to Regurin up to 200 mg/kg/day showed no increased developmental toxicity over background in surviving pups. However, maternal toxicity (death, irregular breathing, increased excitability) was observed at 200 mg/kg/day. A no-effect level for maternal and pup toxicity (survival to Day 4) was 20 mg/kg/day, an exposure approximately equivalent to the maximal recommended human dose (MRHD) of 40 mg.

In a rabbit embryo/fetal development study, pregnant rabbits received doses of Regurin up to 200 mg/kg/day, from implantation to closure of the fetal hard palate. At 200 mg/kg/day, maternal systemic exposures corresponded to approximately 16 times the exposure of women treated at the MRHD of 40 mg, based on AUC. However, one fetus in each of the three treated dose groups (0.3 to 16 times exposures at the MRHD) demonstrated multiple malformations, including umbilical hernia and skeletal malformations. A maternal no-effect level was set at 20 mg/kg/day, at an exposure approximately equivalent to the maximal recommended human dose (MRHD) of 40 mg, due to clinical signs (reduced feces, hunched posture, diarrhea) observed in a pharmacokinetic study at 200 mg/kg/day.

8.2 Labor and Delivery

The effect of Regurin tablets on labor and delivery is unknown.

8.3 Nursing Mothers

Regurin was excreted, to a limited extent (less than 1%), into the milk of lactating rats (primarily as parent compound). It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, Regurin should be used during lactation only if the potential benefit justifies the potential risk to the newborn.

8.4 Pediatric Use

The safety and effectiveness of Regurin in pediatric patients have not been established.

8.5 Geriatric Use

Of the 591 patients with overactive bladder who received treatment with Regurin in the two U.S., placebo-controlled, efficacy and safety studies, 249 patients were 65 years of age and older. Eighty-eight Regurin treated patients (15%) were greater than or equal to 75 years of age.

In these 2 studies, the incidence of commonly reported anticholinergic adverse reactions in patients treated with Regurin (including dry mouth, constipation, dyspepsia, urinary tract infection, and urinary retention) was higher in patients 75 years of age and older as compared to younger patients. This effect may be related to an enhanced sensitivity to anticholinergic agents in this patient population [see Clinical Pharmacology (12.3)]. Therefore, based upon tolerability, the dose frequency of Regurin may be reduced to 20 mg once daily in patients 75 years of age and older.

8.6 Renal Impairment

Severe renal impairment (creatinine clearance less than 30 mL/minute) significantly altered the disposition of Regurin. A 4.2-fold and 1.8-fold increase in mean AUC_(0-∞) and C_max, respectively, and the appearance of an additional elimination phase with a long half-life (~33 hr) were detected in patients with severe renal impairment compared with nearly age-matched subjects with creatinine clearance equal to or higher than 80 mL/min. The different pharmacokinetic behavior of Regurin in patients with severe renal impairment necessitates adjustment of dosage frequency [see Dosage and Administration (2)]. The pharmacokinetics of trospium have not been studied in patients with creatinine clearance ranging from 30-80 mL/min.

Trospium is known to be substantially excreted by the kidney, and the risk of adverse reactions may be greater in patients with impaired renal function.

8.7 Hepatic Impairment

There is no information regarding the effect of severe hepatic impairment on exposure to Regurin. In a study of patients with mild and with moderate hepatic impairment, given 40 mg of immediate-release Regurin, mean C_max increased 12% and 63%, respectively, and mean AUC_(0-∞) decreased 5% and 15%, respectively, compared to healthy subjects. The clinical significance of these findings is unknown. Caution should be used when administering Regurin to patients with moderate and severe hepatic impairment.

10 Overdosage

Overdosage with antimuscarinic agents, including Regurin, can result in severe antimuscarinic effects. Supportive treatment should be provided according to symptoms. In the event of overdosage, electrocardiographic monitoring is recommended.

A 7-month-old baby experienced tachycardia and mydriasis after administration of a single dose of trospium 10 mg given by a sibling. The baby’s weight was reported as 5 kg. Following admission into the hospital and about 1 hour after ingestion of the trospium, medicinal charcoal was administered for detoxification. While hospitalized, the baby experienced mydriasis and tachycardia up to 230 beats per minute. Therapeutic intervention was not deemed necessary. The baby was discharged as completely recovered the following day.

11 DESCRIPTION

Regurin USP is a quaternary ammonium compound with the chemical name of Spiro[8-azoniabicyclo[3.2.1]octane-8,1'-pyrrolidinium], 3-[(hydroxydiphenylacetyl)oxy]-, chloride, (1α, 3β, 5α). The empirical formula of Regurin USP is C₂₅H₃₀ClNO₃ and its molecular weight is 427.97. The structural formula of Regurin USP is represented below:

Regurin USP is a white or almost white, crystalline powder. It is soluble in water, freely soluble in methanol, practically insoluble in methylene chloride.

Each Regurin^{tablet USP contains 20 mg of Regurin USP, a muscarinic antagonist, for oral administration. Each tablet also contains the following inactive ingredients: microcrystalline cellulose, lactose monohydrate, corn starch, povidone, croscarmellose sodium, colloidal silicon dioxide, magnesium stearate, sucrose, copovidone, titanium dioxide, polyethylene glycol 6000, talc, hypromellose, macrogol, yellow iron oxide, red iron oxide.}

Regurin structural formula

12 CLINICAL PHARMACOLOGY

12.1 Mechanism of Action

Regurin is a muscarinic antagonist.

Regurin antagonizes the effect of acetylcholine on muscarinic receptors in cholinergically innervated organs including the bladder. Its parasympatholytic action reduces the tonus of smooth muscle in the bladder.

Receptor assays showed that Regurin has negligible affinity for nicotinic receptors as compared to muscarinic receptors at concentrations obtained from therapeutic doses.

12.2 Pharmacodynamics

Placebo-controlled studies employing urodynamic variables were conducted in patients with conditions characterized by involuntary detrusor contractions. The results demonstrate that Regurin^{increases maximum cystometric bladder capacity and volume at first detrusor contraction.}

Electrophysiology

The effect of 20 mg twice daily and up to 100 mg twice daily Regurin on QT interval was evaluated in a single-blind, randomized, placebo and active controlled 5 day parallel trial in 170 male and female healthy volunteer subjects aged 18 to 45 years. The QT interval was measured over a 24-hour period at steady state. The 100 mg twice daily dose of Regurin was chosen because this achieves the C_max expected in severe renal impairment. Regurin was not associated with an increase in individual corrected (QTcI) or Fridericia corrected (QTcF) QT interval at any time during steady state measurement, while moxifloxacin was associated with a 6.4 msec increase in QTcF.

In this study, asymptomatic, non-specific T wave inversions were observed more often in subjects receiving Regurin than in subjects receiving moxifloxacin or placebo following five days of treatment. This finding was not observed during routine safety monitoring in 2 other placebo-controlled clinical trials in 591 Regurin treated overactive bladder patients [see Clinical Studies (14)]. The clinical significance of T wave inversion in this study is unknown. Regurin is associated with an increase in heart rate that correlates with increasing plasma concentrations. In the study described above, Regurin demonstrated a mean increase in heart rate compared to placebo of 9.1 bpm for the 20 mg dose and of 18 bpm for the 100 mg dose. In the two U.S. placebo-controlled trials in patients with overactive bladder, the mean increase in heart rate compared to placebo in Study 1 was observed to be 3 bpm and in Study 2 was 4 bpm.

12.3 Pharmacokinetics

Absorption:

After oral administration, less than 10% of the dose is absorbed. Mean absolute bioavailability of a 20 mg dose is 9.6%. Peak plasma concentrations (C_max) occur between 5 to 6 hours post-dose. Mean C_max increases greater than dose-proportionally; a 3-fold and 4-fold increase in C_max was observed for dose increases from 20 mg to 40 mg and from 20 mg to 60 mg, respectively. AUC exhibits dose linearity for single doses up to 60 mg. Regurin exhibits diurnal variability in exposure with a decrease in C_max and AUC of up to 59% and 33%, respectively, for evening relative to morning doses.

Effect of Food:

Administration with a high (50%) fat-content meal resulted in reduced absorption, with AUC and C_max values 70-80% lower than those obtained when Regurin was administered while fasting. Therefore, it is recommended that Regurin^{should be taken at least one hour prior to meals or on an empty stomach [see Dosage and Administration (2)].}

A summary of mean (± standard deviation) pharmacokinetic parameters for a single 20 mg dose of Regurin tablets is provided in Table 2.

Table 2. Mean (± SD) Pharmacokinetic Parameter Estimates for a Single 20 mg Regurin Tablet Dose in Healthy Volunteers

The mean plasma concentration-time (+ SD) profile for Regurin is shown in Figure 1.

Figure 1 -Mean (+ SD) Concentration-Time Profile for a Single 20 mg Oral Dose of Regurin Tablets in Healthy Volunteers

Figure 1 -Mean (+ SD) Concentration-Time Profile for a Single 20 mg Oral Dose of Regurin Tablets in Healthy Volunteers

Distribution:

Protein binding ranged from 50 to 85% when concentration levels of Regurin were incubated with human serum in vitro.

The ³H-trospium chloride ratio of plasma to whole blood was 1.6:1. This ratio indicates that the majority of ³H-trospium chloride is distributed in plasma.

The apparent volume of distribution for a 20 mg oral dose is 395 (± 140) liters.

Metabolism:

The metabolic pathway of trospium in humans has not been fully defined. Of the 10% of the dose absorbed, metabolites account for approximately 40% of the excreted dose following oral administration. The major metabolic pathway is hypothesized as ester hydrolysis with subsequent conjugation of benzylic acid to form azoniaspironortropanol with glucuronic acid. Cytochrome P450 (CYP) is not expected to contribute significantly to the elimination of trospium. Data taken from in vitro human liver microsomes investigating the inhibitory effect of trospium on seven CYP isoenzyme substrates (CYP1A2, 2A6, 2C9, 2C19, 2D6, 2E1, and 3A4) suggest a lack of inhibition at clinically relevant concentrations.

Excretion:

The plasma half-life for Regurin following oral administration is approximately 20 hours. After oral administration of an immediate-release formulation of ¹⁴C-trospium chloride, the majority of the dose was recovered in feces and a smaller amount (5.8% of the dose) was recovered in urine; 60% of the radioactivity excreted in urine was unchanged trospium.

The mean renal clearance for trospium (29.07 L/hour) is 4-fold higher than average glomerular filtration rate, indicating that active tubular secretion is a major route of elimination for trospium. There may be competition for elimination with other compounds that are also renally eliminated [see Drug Interactions (7.2)].

Drug Interactions

Digoxin: Concomitant use of 20 mg Regurin immediate release twice daily at steady state and a single dose of 0.5 mg digoxin in a crossover study with 40 male and female subjects did not affect the pharmacokinetics of either drug.

Metformin: A drug interaction study was conducted in which Regurin extended release 60 mg once daily was coadministered with Glucophage ^® (metformin hydrochloride) 500 mg twice daily under steady-state conditions in 44 healthy subjects. Co-administration of 500 mg metformin immediate release tablets twice daily reduced the steady-state systemic exposure of trospium by approximately 29% for mean AUC_0-24 and by 34% for mean C_max. The effect of decrease in trospium exposure on the efficacy of Regurin extended release is unknown. The steady-state pharmacokinetics of metformin were comparable when administered with or without 60 mg Regurin extended release once daily under fasted condition. The effect of metformin at higher doses on trospium PK is unknown.

Specific Populations

Age : Age did not appear to significantly affect the pharmacokinetics of Regurin, however, increased anticholinergic side effects unrelated to drug exposure were observed in patients greater than or equal to 75 years of age [see Use in Specific Populations (8.5)].

Pediatric : The pharmacokinetics of Regurin were not evaluated in pediatric patients.

Race : Pharmacokinetic differences due to race have not been studied.

Gender : Studies comparing the pharmacokinetics in different genders had conflicting results. When a single 40 mg Regurin tablets dose was administered to 16 elderly subjects, exposure was 45% lower in elderly females compared to elderly males. When 20 mg Regurin tablets was dosed twice daily for 4 days to 6 elderly males and 6 elderly females (60 to 75 years), AUC and C_max were 26% and 68% higher, respectively, in females without hormone replacement therapy than in males.

Renal Impairment: In a clinical pharmacokinetic study where a single dose of 40 mg immediate release Regurin was administered to 12 healthy males and 12 males with severe renal impairment, severe renal impairment (creatinine clearance less than 30 mL/minute) significantly altered the disposition of Regurin. A 4.2-fold and 1.8-fold increase in mean AUC_(0-∞) and C_max, respectively, and the appearance of an additional elimination phase with a long half-life (~33 hours vs. 18 hours) were detected in patients with severe renal impairment compared with nearly age-matched subjects with creatinine clearance equal to or higher than 80 mL/min. The different pharmacokinetic behavior of Regurin^{in patients with severe renal impairment necessitates adjustment of dosage frequency [see Dosage and Administration (2)]. The pharmacokinetics of trospium have not been studied in patients with creatinine clearance ranging from 30-80 mL/min.}

Hepatic Impairment: In a clinical pharmacokinetic study in patients with mild (Child-Pugh score 5-6) and with moderate (Child-Pugh score 7-8) hepatic impairment, given a single dose of 40 mg immediate-release Regurin, mean C_max increased 12% and 63%, respectively, and mean AUC_(0-∞) decreased 5% and 15%, respectively, compared to healthy subjects. There is no information regarding the effect of severe hepatic impairment on exposure to Regurin.

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenesis: Carcinogenicity studies with Regurin were conducted in mice and rats for 78 weeks and 104 weeks, respectively, at maximally tolerated doses. No evidence of a carcinogenic effect was found in either mice or rats administered up to 200 mg/kg/day, approximately 9 times the expected clinical exposure levels at the maximum recommended human dose (MRHD) of 40 mg.

Mutagenesis: Regurin was not mutagenic nor genotoxic in tests in vitro in bacteria (Ames test) and mammalian cells (L5178Y mouse lymphoma and CHO cells) or in vivo in the rat micronucleus test.

Impairment of Fertility: No evidence of impaired fertility was observed in rats administered doses up to 200 mg/kg/day (about 16 times the expected clinical exposure at the MRHD, based on AUC).

14 CLINICAL STUDIES

Regurin was evaluated for the treatment of patients with overactive bladder who had symptoms of urinary frequency, urgency, and urge incontinence in two U.S. 12-week, placebo-controlled studies and one 9-month open label extension.

Study 1 was a randomized, double-blind, placebo-controlled, parallel-group study in 523 patients. A total of 262 patients received Regurin tablets 20 mg twice daily and 261 patients received placebo. The majority of patients were Caucasian (85%) and female (74%) with a mean age of 61 years (range: 21 to 90 years). Entry criteria required that patients have urge or mixed incontinence (with a predominance of urge), urge incontinence episodes of at least 7 per week, and greater than 70 micturitions per week. The patient’s medical history and urinary diary during the treatment-free baseline confirmed the diagnosis. Reductions in urinary frequency, urge incontinence episodes and urinary void volume for placebo and Regurin treatment groups are summarized in Table 3 and Figures 2 and 3.

Table 3. Mean (SE) change from baseline to end of treatment (Week 12 or last observation carried forward) for urinary frequency, urge incontinence episodes, and void volume in Study 1

Figure 2 – Mean Change from Baseline in Urinary Frequency/24 Hours, by Visit: Study 1

Figure 3 – Mean Change from Baseline in Urge Incontinence/Week, by Visit: Study 1

Study 2 was nearly identical in design to Study 1. A total of 329 patients received Regurin tablets 20 mg twice daily and 329 patients received placebo. The majority of patients were Caucasian (88%) and female (82%) with a mean age of 61 years (range: 19 to 94 years). Entry criteria were identical to Study 1. Reductions in urinary frequency, urge incontinence episodes, and urinary void volume for placebo and Regurin treatment groups are summarized in Table 4 and Figures 4 and 5.

Table 4. Mean (SE) change from baseline to end of treatment (Week 12 or last observation carried forward) for urinary frequency, urge incontinence episodes, and void volume in Study 2

Figure 4 – Mean Change from Baseline in Urinary Frequency/24 Hours, by Visit: Study 2

Figure 5 – Mean Change from Baseline in Urge Incontinence/Week, by Visit: Study 2

Figure 2 – Mean Change from Baseline in Urinary Frequency/24 Hours, by Visit: Study 1 Figure 3 – Mean Change from Baseline in Urge Incontinence/Week, by Visit: Study 1 Figure 4 – Mean Change from Baseline in Urinary Frequency/24 Hours, by Visit: Study 2 Figure 5 – Mean Change from Baseline in Urge Incontinence/Week, by Visit: Study 2

16 HOW SUPPLIED/STORAGE AND HANDLING

Regurin tablets USP 20 mg (brownish yellow, round, biconvex film-coated tablets, debossed with ‘L’ on one side and ‘1’ on other side) are supplied as follows:

Bottles of 30 NDC 68462-461-30

Bottles of 60 NDC 68462-461-60

Bottles of 500 NDC 68462-461-05

Bottles of 1000 NDC 68462-461-10

Store at 20° to 25°C (68° to 77°F); excursions permitted to 15° to 30°C (59° to 86°F).

Protect from light.

17 PATIENT COUNSELING INFORMATION

“See FDA-approved Patient Labeling ”

17.1 Angioedema

Patients should be informed that Regurin, the active ingredient in Regurin tablets, may produce angioedema which could result in life-threatening airway obstruction. Patients should be advised to promptly discontinue Regurin tablets and seek immediate medical attention if they experience edema of the tongue, edema of the laryngopharynx, or difficulty breathing.

17.2 When Not to Use

Prior to treatment, patients should fully understand the risks and benefits of Regurin. In particular, patients should be informed not to take Regurin tablets if they:

• have urinary retention;
• gastric retention;
• uncontrolled narrow-angle glaucoma;
• are allergic to any component of Regurin tablets.

17.3 Administration

Patients should be instructed regarding the recommended dosing and administration of Regurin tablets:

• Take one Regurin tablet twice daily with water.
• Take Regurin tablets on an empty stomach or at least 1 hour before a meal.

17.4 Adverse Reactions

Patients should be informed that the most common side effects with Regurin are dry mouth and constipation and that other less common side effects include trouble emptying the bladder, blurred vision, and heat prostration. Because anticholinergics, such as Regurin, may produce dizziness or blurred vision, patients should be advised to exercise caution in decisions to engage in potentially dangerous activities until the drug’s effects have been determined. Patients should be informed that alcohol may enhance the drowsiness caused by anticholinergic agents.

PATIENT INFORMATION

Regurin Tablets USP

Read the Patient Information that comes with Regurin tablets before you start taking it and each time you get a refill. There may be new information. This leaflet does not take the place of talking with your doctor about your medical condition or your treatment.

What are Regurin tablets?

Regurin tablets are a prescription medicine used to treat adults with overactive bladder who have the following symptoms:

• a strong need to urinate right away;
• leaking or wetting accidents due to a strong need to urinate right away;
• a need to urinate often.

Who should not take Regurin tablets?

Do not take Regurin tablets if you:

• have trouble emptying your bladder;
• have delayed or slow emptying of your stomach;
• have an eye problem called “uncontrolled narrow-angle glaucoma”;
• are allergic to Regurin tablets or any of its ingredients. See the end of this leaflet for a complete list of ingredients.

Regurin tablets have not been studied in children under the age of 18 years.

What should I tell my doctor before starting Regurin tablets?

Tell your doctor about all of your medical conditions including if you:

• have any stomach or intestinal problems or problems with constipation;
• have trouble emptying your bladder or have a weak urine stream;
• have an eye problem called narrow-angle glaucoma;
• have kidney problems;
• have liver problems;
• are pregnant or planning to become pregnant. It is not known if Regurin tablets can harm your unborn baby.
• are breastfeeding. It is not known if Regurin passes into breast milk and if it can harm your baby. You should talk to your doctor about the best way to feed your baby if you are taking Regurin tablets.

Tell your doctor about all the medicines you take including prescription and nonprescription medicines, vitamins and herbal supplements. Regurin tablets and certain other medicines can interact and make some side effects worse. Regurin tablets can affect how other medicines are handled by the body.

Know all the medicines you take. Keep a list of them with you to show your doctor and pharmacist each time you get a new medicine.

How should I take Regurin tablets?

Take Regurin tablets exactly as prescribed.

• Take one Regurin tablet twice daily with water.
• Take Regurin tablets on an empty stomach or at least 1 hour before a meal.
• If you take too much Regurin call your local Poison Control Center or go to an emergency room right away.

What are the possible side effects of Regurin tablets?

Regurin tablets may cause allergic reactions that may be serious. Symptoms of a serious allergic reaction may include swelling of the face, lips, throat or tongue. If you experience these symptoms, you should stop taking Regurin tablets and get emergency medical help right away.

The most common side effects with Regurin tablets are:

• dry mouth;
• constipation;
• headache.

Regurin tablets may cause other less common side effects, including:

• trouble emptying the bladder;
• blurred vision; and drowsiness. Do not drive or operate heavy machinery until you know how Regurin tablets affect you. Alcohol can worsen the drowsiness caused by drugs such as Regurin tablets.
• heat prostration. Due to decreased sweating, heat prostration can occur when drugs such as Regurin tablets are used in a hot environment.

Tell your doctor if you have any side effects that bother you or that do not go away.

These are not all possible side effects of Regurin tablets. For more information, ask your doctor, healthcare professional or pharmacist.

How should I store Regurin tablets?

• Keep Regurin tablets and all other medicines out of the reach of children.
• Store Regurin tablets at room temperature, 68° to 77°F (20° to 25°C). Protect from light.
• Safely dispose of Regurin tablets that are out of date or that you no longer need.

General information about Regurin tablets

Medicines are sometimes prescribed for conditions that are not mentioned in patient information leaflets. Do not use Regurin tablets^{for a condition for which they were not prescribed. Do not give Regurin tablets to other people, even if they have the same symptoms you have. It may harm them.}

This leaflet summarizes the most important information about Regurin tablets. If you would like more information, talk with your doctor. You can ask your doctor or pharmacist for information about Regurin tablets that is written for health professionals. You can also call Glenmark Pharmaceuticals Inc., USA at 1 (888)721-7115.

What are the ingredients in Regurin tablets?

Active Ingredient: Regurin USP.

Inactive Ingredients: microcrystalline cellulose, lactose monohydrate, corn starch, povidone, croscarmellose sodium, colloidal silicon dioxide, magnesium stearate, sucrose, copovidone, titanium dioxide, polyethylene glycol 6000, talc, hypromellose, macrogol, yellow iron oxide, red iron oxide.

Rx only

Manufactured by:

Glenmark Pharmaceuticals Ltd.

India

Manufactured for:

Glenmark Pharmaceuticals Inc., USA

Mahwah, NJ 07430

Questions? 1 (888)721-7115

www.glenmarkpharma.com/usa

December 2014

Glenmark logo

NDC 68462-461-60

Regurin TABLETS USP

20 mg

Pharmacist: Dispense the patient information sheet provided separately to each patient.

20mg

Regurin pharmaceutical active ingredients containing related brand and generic drugs:

• Trospium Chloride

Regurin available forms, composition, doses:

• Tablets, Coated; Oral; Trospium Chloride 20 mg

Regurin destination | category:

• Human:
• Genitourinary smooth muscle relaxants

Regurin Anatomical Therapeutic Chemical codes:

• G04BD09 - Trospium

Regurin pharmaceutical companies:

• Allphar Services
• Galen

References

1. Dailymed."TROSPIUM CHLORIDE TABLET, FILM COATED [GLENMARK PHARMACEUTICALS INC., USA]". https://dailymed.nlm.nih.gov/dailym... (accessed August 28, 2018).
2. Dailymed."TROSPIUM CHLORIDE: DailyMed provides trustworthy information about marketed drugs in the United States. DailyMed is the official provider of FDA label information (package inserts).". https://dailymed.nlm.nih.gov/dailym... (accessed August 28, 2018).
3. "Trospium". https://pubchem.ncbi.nlm.nih.gov/co... (accessed August 28, 2018).

Frequently asked Questions

Depending on the reaction of the Regurin after taken, if you are feeling dizziness, drowsiness or any weakness as a reaction on your body, Then consider Regurin not safe to drive or operate heavy machine after consumption. Meaning that, do not drive or operate heavy duty machines after taking the capsule if the capsule has a strange reaction on your body like dizziness, drowsiness. As prescribed by a pharmacist, it is dangerous to take alcohol while taking medicines as it exposed patients to drowsiness and health risk. Please take note of such effect most especially when taking Primosa capsule. It's advisable to consult your doctor on time for a proper recommendation and medical consultations.

Medicines are not designed with the mind of creating an addiction or abuse on the health of the users. Addictive Medicine is categorically called Controlled substances by the government. For instance, Schedule H or X in India and schedule II-V in the US are controlled substances.

Please consult the medicine instruction manual on how to use and ensure it is not a controlled substance.In conclusion, self medication is a killer to your health. Consult your doctor for a proper prescription, recommendation, and guidiance.

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The information was verified by Dr. Rachana Salvi, MD Pharmacology