TIOPRONIN

6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in other sections of the labeling: Proteinuria [see Warnings and Precautions ( 5.1 )] Hypersensitivity [see Warnings and Precautions ( 5.2 )] Most common adverse reactions (≥10%) are nausea, diarrhea or soft stools, oral ulcers, rash, fatigue, fever, arthralgia, proteinuria, and emesis. ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Torrent Pharma Inc. at 1-800-912-9561 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 the drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Adverse reactions occurring at an incidence of ≥5% in an uncontrolled trial in 66 patients with cystinuria age 9 to 68 years are shown in the table below. Patients in group 1 had previously been treated with d-penicillamine; those in group 2 had not. Of those patients who had stopped taking d-penicillamine due to toxicity (34 out of 49 patients in group 1), 22 were able to continue treatment with tiopronin. In those without prior history of d-penicillamine treatment, 6% developed reactions of sufficient severity to require tiopronin withdrawal. Table 1 presents adverse reactions ≥5% in either treatment group occurring in this trial. Table 1: Adverse Reactions Occurring in One or More Patients System Organ Class Adverse Reaction Group 1 Previously treated with d-penicillamine (N = 49) Group 2 Naïve to d-penicillamine (N = 17) Blood and Lymphatic System Disorders anemia 1 (2%) 1 (6%) Gastrointestinal Disorders nausea 12 (25%) 2 (12%) emesis 5 (10%) – diarrhea/soft stools 9 (18%) 1 (6%) abdominal pain – 1 (6%) oral ulcers 6 (12%) 3 (18%) General Disorders and Administration Site Conditions fever 4 (8%) – weakness 2 (4%) 2 (12%) fatigue 7 (14%) – peripheral (edema) 3 (6%) 1 (6%) chest pain – 1 (6%) Metabolism and Nutrition Disorders anorexia 4 (8%) – Musculoskeletal and Connective Tissue Disorders arthralgia – 2 (12%) Renal and Urinary Disorders proteinuria 5 (10%) 1 (6%) impotence – 1 (6%) Respiratory, Thoracic and Mediastinal Disorders cough – 1 (6%) Skin and Subcutaneous Tissue Disorders rash 7 (14%) 2 (12%) ecchymosis 3 (6%) – pruritus 2 (4%) 1 (6%) urticaria 4 (8%) – skin wrinkling 3 (6%) 1 (6%) Taste Disturbance A reduction in taste perception may develop. It is believed to be the result of chelation of trace metals by tiopronin. Hypogeusia is often self-limited. 6.2 Postmarketing Experience Adverse reactions have been reported from the literature, as well as during post-approval use of tiopronin. Because the post-approval 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 tiopronin exposure. Adverse reactions reported during the postmarketing use of tiopronin are listed by body system in Table 2 . Table 2: Adverse Reactions Reported for Tiopronin Pharmacovigilance by System Organ Class and Preferred Term System Organ Class Preferred Term Cardiac Disorders congestive heart failure Ear and Labyrinth Disorder vertigo Gastrointestinal Disorders abdominal discomfort; abdominal distension; abdominal pain; chapped lips; diarrhea; dry mouth; dyspepsia; eructation; flatulence; gastrointestinal disorder; gastroesophageal reflux disease; nausea; vomiting; jaundice; liver transaminitis General Disorders and Administration Site Conditions asthenia; chest pain; fatigue; malaise; pain; peripheral swelling; pyrexia; swelling Investigations glomerular filtration rate decreased; weight increased Metabolism and Nutrition Disorders decreased appetite; dehydration; hypophagia Musculoskeletal and Connective Tissue Disorders arthralgia; back pain; flank pain; joint swelling; limb discomfort; musculoskeletal discomfort; myalgia; neck pain; pain in extremity Nervous System Disorders ageusia; burning sensation; dizziness; dysgeusia; headache; hypoesthesia Renal and Urinary Disorders nephrotic syndrome; proteinuria; renal failure Skin and Subcutaneous Tissue Disorders dry skin; hyperhidrosis; pemphigus foliaceus; pruritus; rash; rash pruritic; skin irritation; skin texture abnormal; skin wrinkling; urticaria

4 CONTRAINDICATIONS Tiopronin delayed-release tablets are contraindicated in patients with hypersensitivity to tiopronin or any other components of tiopronin delayed-release tablets [see Warnings and Precautions ( 5.2 )] . Hypersensitivity to tiopronin or any component of tiopronin delayed-release tablets ( 4 )

11 DESCRIPTION Tiopronin delayed-release tablets are a reducing and cystine-binding thiol drug (CBTD) for oral use. Tiopronin is N‑(2‑Mercaptopropionyl) glycine and has the following structure: Tiopronin has the empirical formula C 5 H 9 NO 3 S and a molecular weight of 163.19. In this drug product tiopronin exists as a dl racemic mixture. Tiopronin is a white to off-white color crystalline powder, which is freely soluble in water. Each tiopronin delayed-release tablet contains 100 or 300 mg of tiopronin. The inactive ingredients in tiopronin delayed-release tablets include lactose monohydrate, low substitute hydroxypropyl cellulose, hydroxypropyl cellulose, magnesium stearate, hypromellose 2910, methacrylic acid: ethyl acrylate copolymer (Eudragit L 100-55), talc, triethyl citrate. The imprinting ink contains shellac, ferrosoferric oxide and propylene glycol. structural formula

2 DOSAGE AND ADMINISTRATION The recommended initial dosage in adult patients is 800 mg/day. In clinical studies, the average dosage was about 1,000 mg/day. ( 2.1 ) The recommended initial dosage in pediatric patients 9 years of age and older is 15 mg/kg/day. Avoid dosages greater than 50 mg/kg per day in pediatric patients. ( 5.1 , 8.4 ) Measure urinary cystine 1 month after initiation of tiopronin delayed-release tablets and every 3 months thereafter ( 2.3 ) Administer tiopronin delayed-release tablets in 3 divided doses at the same times each day, without food. ( 2.1 ) 2.1 Recommended Dosage Adults : The recommended initial dosage in adult patients is 800 mg/day. In clinical studies, the average dosage was about 1,000 mg/day. Pediatrics : The recommended initial dosage in pediatric patients 9 years of age and older is 15 mg/kg/day. Avoid dosages greater than 50 mg/kg per day in pediatric patients [see Warnings and Precautions ( 5.1 ), Use in Specific Populations ( 8.4 )] . Administer tiopronin delayed-release tablets in 3 divided doses at the same times each day, without food. Consider starting tiopronin delayed-release tablets at a lower dosage in patients with history of severe toxicity to d-penicillamine. Additional pediatric use information is approved for Mission Pharmacal Company’s Thiola EC (tiopronin delayed-release) tablets. However, due to Mission Pharmacal Company’s marketing exclusivity rights, this drug product is not labeled with that information. 2.3 Monitoring Measure urinary cystine 1 month after starting tiopronin delayed-release tablets and every 3 months thereafter. Adjust tiopronin delayed-release tablets dosage to maintain urinary cystine concentration less than 250 mg/L. Assess for proteinuria before treatment and every 3 to 6 months during treatment [see Warnings and Precautions ( 5.1 )] . Discontinue tiopronin delayed-release tablets in patients who develop proteinuria, and monitor urinary protein and renal function. Consider restarting tiopronin delayed-release tablets treatment at a lower dosage after resolution of proteinuria.

10 OVERDOSAGE There is no information on overdosage with tiopronin.

7 DRUG INTERACTIONS 7.1 Alcohol Tiopronin is released faster from tiopronin delayed-release tablets in the presence of alcohol and the risk for adverse events associated with tiopronin delayed-release tablets when taken with alcohol is unknown. Avoid alcohol consumption 2 hours before and 3 hours after taking tiopronin delayed-release tablets [see Clinical Pharmacology ( 12.3 )] .

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action The goal of therapy is to reduce urinary cystine concentration below its solubility limit. Tiopronin is an active reducing agent which undergoes thiol-disulfide exchange with cystine to form a mixed disulfide of tiopronin-cysteine. From this reaction, a water-soluble mixed disulfide is formed and the amount of sparingly soluble cystine is reduced. 12.2 Pharmacodynamics The decrement in urinary cystine produced by tiopronin is generally proportional to the dose. A reduction in urinary cystine of 250 to 350 mg/day at tiopronin dosage of 1 g/day, and a decline of approximately 500 mg/day at a dosage of 2 g/day, might be expected. Tiopronin has a rapid onset and offset of action, showing a fall in cystine excretion on the first day of administration and a rise on the first day of drug withdrawal. 12.3 Pharmacokinetics Absorption Tiopronin Delayed-Release Tablets When tiopronin IR and tiopronin delayed-release tablets single doses were given to fasted healthy subjects, the median time to peak plasma levels (T max ) was 1 (range: 0.5 to 2.1) and 3 (range: 1.0 to 6.0) hours, respectively. The peak exposure (C max ) and total exposure (AUC 0-t ) of tiopronin from tiopronin delayed-release tablets were decreased by 22% and 7% respectively compared to tiopronin IR tablets. Elimination Excretion When tiopronin is given orally, up to 48% of dose appears in urine during the first 4 hours and up to 78% by 72 hours. Drug Interactions Alcohol An in vitro dissolution study was conducted to evaluate the impact of alcohol (5, 10, 20, and 40%) on the dose dumping of tiopronin delayed- release tablets. The study results showed that the addition of alcohol to the dissolution media increases the dissolution rate of tiopronin delayed- release tablets in the acidic media of 0.1N HCl [see Drug Interactions ( 7.1 )] .

12.1 Mechanism of Action The goal of therapy is to reduce urinary cystine concentration below its solubility limit. Tiopronin is an active reducing agent which undergoes thiol-disulfide exchange with cystine to form a mixed disulfide of tiopronin-cysteine. From this reaction, a water-soluble mixed disulfide is formed and the amount of sparingly soluble cystine is reduced.

12.2 Pharmacodynamics The decrement in urinary cystine produced by tiopronin is generally proportional to the dose. A reduction in urinary cystine of 250 to 350 mg/day at tiopronin dosage of 1 g/day, and a decline of approximately 500 mg/day at a dosage of 2 g/day, might be expected. Tiopronin has a rapid onset and offset of action, showing a fall in cystine excretion on the first day of administration and a rise on the first day of drug withdrawal.

12.3 Pharmacokinetics Absorption Tiopronin Delayed-Release Tablets When tiopronin IR and tiopronin delayed-release tablets single doses were given to fasted healthy subjects, the median time to peak plasma levels (T max ) was 1 (range: 0.5 to 2.1) and 3 (range: 1.0 to 6.0) hours, respectively. The peak exposure (C max ) and total exposure (AUC 0-t ) of tiopronin from tiopronin delayed-release tablets were decreased by 22% and 7% respectively compared to tiopronin IR tablets. Elimination Excretion When tiopronin is given orally, up to 48% of dose appears in urine during the first 4 hours and up to 78% by 72 hours. Drug Interactions Alcohol An in vitro dissolution study was conducted to evaluate the impact of alcohol (5, 10, 20, and 40%) on the dose dumping of tiopronin delayed- release tablets. The study results showed that the addition of alcohol to the dissolution media increases the dissolution rate of tiopronin delayed- release tablets in the acidic media of 0.1N HCl [see Drug Interactions ( 7.1 )] .

20241101

2

3 DOSAGE FORMS AND STRENGTHS Tablets for oral use: 100 mg tablets: White to off-white, round shaped, enteric coated tablets imprinted with "1A" with black ink on one side and plain on other side, free from physical defects. 300 mg tablets: White to off-white, round shaped, enteric coated tablets imprinted with "3A" with black ink on one side and plain on other side, free from physical defects. Tablets: 100 mg and 300 mg ( 3 )

TIOPRONIN tiopronin TIOPRONIN TIOPRONIN LACTOSE MONOHYDRATE HYDROXYPROPYL CELLULOSE, UNSPECIFIED HYDROXYPROPYL CELLULOSE, LOW SUBSTITUTED HYPROMELLOSE, UNSPECIFIED METHACRYLIC ACID - ETHYL ACRYLATE COPOLYMER (1:1) TYPE A TALC TRIETHYL CITRATE MAGNESIUM STEARATE 1A TIOPRONIN tiopronin TIOPRONIN TIOPRONIN LACTOSE MONOHYDRATE HYDROXYPROPYL CELLULOSE, UNSPECIFIED HYDROXYPROPYL CELLULOSE, LOW SUBSTITUTED HYPROMELLOSE, UNSPECIFIED METHACRYLIC ACID - ETHYL ACRYLATE COPOLYMER (1:1) TYPE A TALC TRIETHYL CITRATE MAGNESIUM STEARATE 3A

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis Long-term carcinogenicity studies in animals have not been performed. Mutagenesis Tiopronin was not genotoxic in the chromosomal aberration, sister chromatid exchange, and in vivo micronucleus assays. Impairment of Fertility High doses of tiopronin in experimental animals have been shown to interfere with maintenance of pregnancy and viability of the fetus. In 2 published male fertility studies in rats, tiopronin at 20 mg/kg/day intramuscular (IM) for 60 days induced reductions in testis, epididymis, vas deferens, and accessory sex glands weights and in the count and motility of cauda epididymal sperm.

13 NONCLINICAL TOXICOLOGY 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility Carcinogenesis Long-term carcinogenicity studies in animals have not been performed. Mutagenesis Tiopronin was not genotoxic in the chromosomal aberration, sister chromatid exchange, and in vivo micronucleus assays. Impairment of Fertility High doses of tiopronin in experimental animals have been shown to interfere with maintenance of pregnancy and viability of the fetus. In 2 published male fertility studies in rats, tiopronin at 20 mg/kg/day intramuscular (IM) for 60 days induced reductions in testis, epididymis, vas deferens, and accessory sex glands weights and in the count and motility of cauda epididymal sperm.

ANDA216990

TIOPRONIN

tiopronin

13668-692

HUMAN PRESCRIPTION DRUG

ORAL

PRINCIPAL DISPLAY PANEL 100 mg - 300 Tablets 300 mg - 90 Tablets image description image description

17 PATIENT COUNSELING INFORMATION Lactation Advise women that breastfeeding is not recommended during treatment with tiopronin delayed-release tablets [see Use in Specific Populations ( 8.2 )] . Manufactured for: Torrent Pharmaceuticals Limited, India Distributed by: Torrent Pharma Inc., Basking Ridge, NJ 07920 8088451 Revised: June 2023 logo

8.5 Geriatric Use This drug is known to be substantially excreted by the kidney, and the risk of adverse 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 renal function.

8.2 Lactation Risk Summary There are no data on the presence of tiopronin in either human or animal milk or on the effects of the breastfed child. A published study suggests that tiopronin may suppress milk production. Because of the potential for serious adverse reactions, including nephrotic syndrome, advise patients that breastfeeding is not recommended during treatment with tiopronin delayed-release tablets.

8.4 Pediatric Use Tiopronin delayed-release tablets are indicated in pediatric patients 9 years of age and older with severe homozygous cystinuria, in combination with high fluid intake, alkali, and diet modification, for the prevention of cystine stone formation who are not responsive to these measures alone. This indication is based on safety and efficacy data from a trial in patients 9 years to 68 years of age and clinical experience. Proteinuria, including nephrotic syndrome, has been reported in pediatric patients. Pediatric patients receiving greater than 50 mg/kg tiopronin per day may be at greater risk [see Dosage and Administration ( 2.1 , 2.3 ), Warnings and Precautions ( 5.1 ) and Adverse Reactions ( 6.1 )] . Tiopronin delayed-release tablets are not approved for use in pediatric patients weighing less than 20 kg or in pediatric patients unable to swallow tablets [see Dosage and Administration ( 2.1 )] . Additional pediatric use information is approved for Mission Pharmacal Company’s Thiola EC (tiopronin delayed-release) tablets. However, due to Mission Pharmacal Company’s marketing exclusivity rights, this drug product is not labeled with that information.

8.1 Pregnancy Risk Summary Available published case report data with tiopronin have not identified a drug-associated risk for major birth defects, miscarriage, or adverse maternal or fetal outcomes. Renal stones in pregnancy may result in adverse pregnancy outcomes (see Clinical Considerations ) . In animal reproduction studies, there were no adverse developmental outcomes with oral administration of tiopronin to pregnant mice and rats during organogenesis at doses up to 2 times a 2 grams/day human dose (based on mg/m 2 ). The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies are 2% to 4% and 15% to 20%, respectively. Clinical Considerations Disease-associated maternal and/or embryo/fetal risk Renal stones in pregnancy may increase the risk of adverse pregnancy outcomes, such as preterm birth and low birth weight. Data Animal Data No findings of fetal malformations could be attributed to the drug in reproduction studies in mice and rats at doses up to 2 times the highest recommended human dose of 2 grams/day (based on mg/m 2 ).

8 USE IN SPECIFIC POPULATIONS Lactation: Breastfeeding is not recommended. ( 8.2 ) Geriatric: Choose dose carefully and monitor renal function in the elderly. ( 8.5 ) Additional pediatric use information is approved for Mission Pharmacal Company’s Thiola EC (tiopronin delayed-release) tablets. However, due to Mission Pharmacal Company’s marketing exclusivity rights, this drug product is not labeled with that information. 8.1 Pregnancy Risk Summary Available published case report data with tiopronin have not identified a drug-associated risk for major birth defects, miscarriage, or adverse maternal or fetal outcomes. Renal stones in pregnancy may result in adverse pregnancy outcomes (see Clinical Considerations ) . In animal reproduction studies, there were no adverse developmental outcomes with oral administration of tiopronin to pregnant mice and rats during organogenesis at doses up to 2 times a 2 grams/day human dose (based on mg/m 2 ). The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies are 2% to 4% and 15% to 20%, respectively. Clinical Considerations Disease-associated maternal and/or embryo/fetal risk Renal stones in pregnancy may increase the risk of adverse pregnancy outcomes, such as preterm birth and low birth weight. Data Animal Data No findings of fetal malformations could be attributed to the drug in reproduction studies in mice and rats at doses up to 2 times the highest recommended human dose of 2 grams/day (based on mg/m 2 ). 8.2 Lactation Risk Summary There are no data on the presence of tiopronin in either human or animal milk or on the effects of the breastfed child. A published study suggests that tiopronin may suppress milk production. Because of the potential for serious adverse reactions, including nephrotic syndrome, advise patients that breastfeeding is not recommended during treatment with tiopronin delayed-release tablets. 8.4 Pediatric Use Tiopronin delayed-release tablets are indicated in pediatric patients 9 years of age and older with severe homozygous cystinuria, in combination with high fluid intake, alkali, and diet modification, for the prevention of cystine stone formation who are not responsive to these measures alone. This indication is based on safety and efficacy data from a trial in patients 9 years to 68 years of age and clinical experience. Proteinuria, including nephrotic syndrome, has been reported in pediatric patients. Pediatric patients receiving greater than 50 mg/kg tiopronin per day may be at greater risk [see Dosage and Administration ( 2.1 , 2.3 ), Warnings and Precautions ( 5.1 ) and Adverse Reactions ( 6.1 )] . Tiopronin delayed-release tablets are not approved for use in pediatric patients weighing less than 20 kg or in pediatric patients unable to swallow tablets [see Dosage and Administration ( 2.1 )] . Additional pediatric use information is approved for Mission Pharmacal Company’s Thiola EC (tiopronin delayed-release) tablets. However, due to Mission Pharmacal Company’s marketing exclusivity rights, this drug product is not labeled with that information. 8.5 Geriatric Use This drug is known to be substantially excreted by the kidney, and the risk of adverse 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 renal function.

16 HOW SUPPLIED/STORAGE AND HANDLING 100 mg delayed-release, white to off-white, round shaped, enteric-coated tablets imprinted with "1A" with black ink on one side and plain on other side, free from physical defects. Bottles of 300 with child-resistant closure, NDC 13668-691-03. 300 mg delayed-release, white to off-white, round shaped, enteric-coated tablets imprinted with "3A" with black ink on one side and plain on other side, free from physical defects. Bottles of 90 with child-resistant closure, NDC 13668-692-90. Store at 25°C (77°F); excursions permitted between 15C° and 30°C (59°F and 86°F) [see USP Controlled Room Temperature] .