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    Tiopronin

    From Wikidoc - Reading time: 10 min

    Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Adeel Jamil, M.D. [2]

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    Overview

    Tiopronin is a renal-urologic agent that is FDA approved for the treatment of and prevention of cystine (kidney) stone formation in patients with severe homozygous cystinuria. Common adverse reactions include nausea, vomiting, abdominal pain, diarrhea, impairment in taste and smell, rash and pruritis.

    Adult Indications and Dosage

    FDA-Labeled Indications and Dosage (Adult)

    • Since there are no known inhibitors of the crystallization of cystine, the stone formation is determined primarily by the urinary supersaturation of cystine. Thus, cystine stones could theoretically form whenever urinary cystine concentration exceeds the solubility limit. Cystine solubility in urine is pH-dependent, and ranges from 170-300 mg/liter at pH 5, 190-400 mg/liter at pH 7 and 220-500 mg/liter at pH 7.5.
    • The goal of therapy is to reduce urinary cystine concentration below its solubility limit. It may be accomplished by dietary means aimed at reducing cystine synthesis and by a high fluid intake in order to increase urine volume and thereby lower cystine concentration.
    • Unfortunately, the above conservative measures alone may be ineffective in controlling cystine stone formation in some homozygous patients with severe cystinuria (urinary cystine exceeding 500 mg/day). In such patients, d-penicillamine has been used as an additional therapy. Like THIOLA™, dpenicillamine undergoes thiol-disulfide exchange with cystine, thereby lowering the amount of sparingly soluble cystine in urine.
    • However, d-penicillamine treatment is frequently accompanied by adverse reactions, such as dermatologic complications, hypersensitivity reactions, hematologic abnormalities and renal disturbances. THIOLA® may have a particular therapeutic role in such patients.

    Dosing Information

    • It is recommended that a conservative treatment program should be attempted first. At least 3 liters of fluid (10-10 oz. glassfuls) should be provided, including two glasses with each meal and at bedtime. The patients should be expected to awake at night to urinate; they should drink two more glasses of fluids before returning to bed. Additional fluids should be consumed if there is excessive sweating or intestinal fluid loss. A minimum urine output of 2 liters/day on a consistent basis should be sought. A modest amount of alkali should be provided in order to maintain urinary pH at a high normal range (6.5-7.0). Potassium alkali are advantageous over sodium alkali, because they do not cause hypercalciuria and are less likely to cause the complication of calcium stones.
    • In patients who continue to form cystine stones on the above conservative program, THIOLA® may be added to the treatment program. THIOLA® may also be substituted for d-penicillamine in patients who have developed toxicity to the latter drug. In both situations, the conservative treatment program should be continued.
    • The dose of THIOLA® should not be arbitrary but should be based on that amount required to reduce urinary cystine concentration to below its solubility limit (generally <250 mg/liter). The extent of the decline in cystine excretion is generally dependent on the THIOLA® dosage.
    • THIOLA® may be begun at a dosage of 800 mg/day in adult patients with cystine stones. In a multiclinic trial, average dose of THIOLA® was about 1000 mg/day. However, some patients require a smaller dose. In children, initial dosage may be based on 15 mg/kg/day. Urinary cystine should be measured at 1 month after THIOLA® treatment, and every 3 months thereafter. THIOLA® dosage should be readjusted depending on the urinary cystine value. Whenever possible, THIOLA® should be given in divided doses 3 times/day at least one hour before or 2 hours after meals.
    • In patients who had shown severe toxicity to d-penicillamine, THIOLA® might be begun at a lower dosage.

    Off-Label Use and Dosage (Adult)

    Guideline-Supported Use

    There is limited information regarding Off-Label Guideline-Supported Use of Tiopronin in adult patients.

    Non–Guideline-Supported Use

    There is limited information regarding Off-Label Non–Guideline-Supported Use of Tiopronin in adult patients.

    Pediatric Indications and Dosage

    FDA-Labeled Indications and Dosage (Pediatric)

    There is limited information regarding FDA-Labeled Use of Tiopronin in pediatric patients.

    Off-Label Use and Dosage (Pediatric)

    Guideline-Supported Use

    There is limited information regarding Off-Label Guideline-Supported Use of Tiopronin in pediatric patients.

    Non–Guideline-Supported Use

    There is limited information regarding Off-Label Non–Guideline-Supported Use of Tiopronin in pediatric patients.

    Contraindications

    • The use of THIOLA® during pregnancy is contraindicated, except in those with severe cystinuria where the anticipated benefit of inhibited stone formation clearly outweighs possible hazards of treatment (see PRECAUTIONS).
    • Mothers maintained on THIOLA® treatment should not nurse their infants.

    Warnings

    • Leukopenia of the granulocytic series may develop without eosinophilia. Thrombocytopenia may be immunologic in origin or occur on an idiosyncratic basis. The reduction in peripheral blood white count to less than 3500/cubic mm or in platelet count to below 100,000 cubic mm mandates cessation of therapy. Patients should be instructed to report promptly the occurrence of any symptom or sign of these hematological abnormalities, such as fever, sore throat, chills, bleeding or easy bruisability.
    • The following complications, though rare, have been reported during d-penicillamine therapy and could occur during THIOLA® treatment. When there are abnormal urinary findings associated with hemoptysis and pulmonary infiltrates suggestive of Goodpasture’s syndrome, THIOLA® treatment should be stopped. Appearance of myasthenic syndrome or myasthenia gravis requires cessation of treatment. When pemphigus-type reactions develop, THIOLA® therapy should be stopped. Steroid treatment may be necessary.

    PRECAUTIONS

    • Patients should be advised of the potential development of complications and to report promptly the occurrence of any symptom or sign of them.
    • To help monitor potential complications, the following tests are recommended: peripheral blood counts, direct platelet count, hemoglobin, serum albumin, liver function tests, 24-hour urinary protein and routine urinalysis at 3- 6 month intervals during treatment. In order to assess effect on stone disease, urinary cystine analysis should be monitored frequently during the first 6 months when the optimum dose schedule is being determined, and at 6-month intervals thereafter. Abdominal roentogenogram (KUB) is advised on a yearly basis to monitor the size and appearance/disappearance of stone(s).

    Adverse Reactions

    Clinical Trials Experience

    • Some patients may develop drug fever, usually during the first month of therapy. THIOLA® treatment should be discontinued until the fever subsides. It may be reinstated at a small dose, with a gradual increase in dosage until the desired level is achieved.
    • A generalized rash (erythematous, maculopapular or morbilliform) accompanied by pruritis may develop during the first few months of treatment. It may be controlled by antihistamine therapy, typically recedes when THIOLA® treatment is discontinued, and seldom recurs when THIOLA® treatment is restarted at a lower dosage. Less commonly, rash may appear late in the course of treatment (of more than 6 months). Located usually in the trunk, the late rash is associated with intense pruritis, recedes slowly after discontinuing treatment, and usually recurs upon resumption of treatment.
    • A reduction in taste perception may develop. It is believed to be the result of chelation of trace metals by THIOLA™. Hypogeusia is often self-limiting.
    • Some patients may complain of wrinkling and friability of skin. This complication usually occurs after long-term treatment, and is believed to result from the effect of THIOLA® on collagen.
    • A multiclinic trial involving 66 cystinuric patients in the United States indicated that THIOLA® is associated with fewer or less severe adverse reactions than d-penicillamine. Among those who had to stop taking d-penicillamine due to toxicity, 64.7% could take THIOLA® . In those without prior history of d-penicillamine treatment, only 5.9% developed reactions of sufficient severity to require THIOLA® withdrawal. A review of available literature supports the findings from this trial.
    • Despite this apparent reduced toxicity to THIOLA® relative to d-penicillamine, THIOLA® treatment may potentially be associated with all the adverse reactions reported with d-penicillamine. They include:
    Digestive
    Hematologic and Lymphatic
    Neurologic
    Respiratory
    Skin and Hypersensitivy Reactions
    Urogenital
    • These reactions are more likely to develop during THIOLA® therapy among patients who had previously shown toxicity to d-penicillamine.
    • In patients who had previously manifested adverse reactions to d-penicillamine, adverse reactions to THIOLA® are more likely to occur than in patients who took THIOLA® for the first time. A close supervision with a careful monitoring of potential side effects is mandatory during THIOLA® treatment. Patients should be told to report promptly any symptoms suggesting toxicity. The treatment with THIOLA® should be stopped if severe toxicity develops.
    • Jaundice and abnormal liver function tests have been reported during THIOLA® therapy for non-cystinuric conditions. A direct cause and effect relationship, based upon these foreign reports, has not been established. Although such complications were not encountered in the small multi-center trials in the United States, patients should be carefully monitored and if any abnormalities are noted, the drug should be discontinued and the patient treated by appropriate measures.

    Postmarketing Experience

    There is limited information regarding Postmarketing Experience of Tiopronin in the drug label.

    Drug Interactions

    There is limited information regarding Drug Interactions of Tiopronin in the drug label.

    Use in Specific Populations

    Pregnancy

    Pregnancy Category (FDA): C

    • D-penicillamine has been shown to cause skeletal defects and cleft palates in the fetus when given to pregnant rats at 10 times the dose recommended for human use. A similar teratogenicity might be expected for THIOLA® although no such findings could be related to the drug in studies in mice and rats at doses up to 10 times the highest recommended human dose.
    • There are no adequate and well-controlled studies in pregnant women. THIOLA® should be used during pregnancy only if the potential benefit justifies potential risk to the fetus.


    Pregnancy Category (AUS):

    • Australian Drug Evaluation Committee (ADEC) Pregnancy Category

    There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Tiopronin in women who are pregnant.

    Labor and Delivery

    There is no FDA guidance on use of Tiopronin during labor and delivery.

    Nursing Mothers

    • Because THIOLA® may be excreted in milk and because of the potential serious adverse reactions of nursing infants from THIOLA®, mothers taking THIOLA® should not nurse their infants.

    Pediatric Use

    • Safety and effectiveness below the age of 9 have not been established.

    Geriatic Use

    There is no FDA guidance on the use of Tiopronin with respect to geriatric patients.

    Gender

    There is no FDA guidance on the use of Tiopronin with respect to specific gender populations.

    Race

    There is no FDA guidance on the use of Tiopronin with respect to specific racial populations.

    Renal Impairment

    There is no FDA guidance on the use of Tiopronin in patients with renal impairment.

    Hepatic Impairment

    There is no FDA guidance on the use of Tiopronin in patients with hepatic impairment.

    Females of Reproductive Potential and Males

    There is no FDA guidance on the use of Tiopronin in women of reproductive potentials and males.

    Immunocompromised Patients

    There is no FDA guidance one the use of Tiopronin in patients who are immunocompromised.

    Administration and Monitoring

    Administration

    • Oral

    Monitoring

    There is limited information regarding Monitoring of Tiopronin in the drug label.

    • Description

    IV Compatibility

    There is limited information regarding IV Compatibility of Tiopronin in the drug label.

    Overdosage

    There is limited information regarding Chronic Overdose of Tiopronin in the drug label.

    Pharmacology

    There is limited information regarding Tiopronin Pharmacology in the drug label.

    Mechanism of Action

    • THIOLA® is an active reducing agent which undergoes thiol-disulfide exchange with cystine to form a mixed disulfide of Thiola-cysteine.
    This image is provided by the National Library of Medicine.
    • From this reaction, a water-soluble mixed disulfide is formed and the amount of sparingly soluble cystine is reduced. When THIOLA® is given orally, up to 48% of dose appears in urine during the first 4 hours and up to 78% by 72 hours. Thus, in patients with cystinuria, sufficient amount of THIOLA® or its active metabolites could appear in urine to react with cystine, lowering cystine excretion.

    Structure

    • THIOLA® (Tiopronin) is a reducing and complexing thiol compound. Tiopronin is N-(2-Mercaptopropionyl) glycine and has the following structure:
    This image is provided by the National Library of Medicine.

    Pharmacodynamics

    There is limited information regarding Pharmacodynamics of Tiopronin in the drug label.

    Pharmacokinetics

    • The decrement in urinary cystine produced by THIOLA® is generally proportional to the dose. A reduction in urinary cystine of 250-350 mg/day at a THIOLA® dosage of 1 g/day, and a decline of approximately 500 mg/day at a dosage of 2 g/day, might be expected. THIOLA® causes a sustained reduction in cystine excretion without apparent loss of effectiveness. THIOLA® 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.

    Nonclinical Toxicology

    CARCINOGENESIS, MUTAGENESIS, IMPAIRMENT OF FERTILITY
    • Long-term carcino-genicity studies in animals have not been performed. High doses of THIOLA® in experimental animals have been shown to interfere with maintenance of pregnancy and viability of the fetus.

    Clinical Studies

    There is limited information regarding Clinical Studies of Tiopronin in the drug label.

    How Supplied

    THIOLA® (NDC 0178-0900-01), is available for oral administration as 100 mg. round, white, sugar coated tablets in bottles of 100 tablets each. Each tablet is imprinted in red with “M” on one side and blank on the other side. C05 Rev 010060

    MISSION PHARMACAL COMPANY, San Antonio, TX 78230 1355

    Storage

    • Store at 25°C (77°F); excursions permitted to 15- 30°C (59-86°F)

    Images

    Drug Images

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    Package and Label Display Panel

    PRINCIPAL DISPLAY PANEL

    THIOLA® Label NDC: 0178-0900-01

    This image is provided by the National Library of Medicine.
    This image is provided by the National Library of Medicine.

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    Patient Counseling Information

    There is limited information regarding Patient Counseling Information of Tiopronin in the drug label.

    Precautions with Alcohol

    • Alcohol-Tiopronin interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.

    Brand Names

    • THIOLA®

    Look-Alike Drug Names

    There is limited information regarding Tiopronin Look-Alike Drug Names in the drug label.

    Drug Shortage Status

    Price

    References

    The contents of this FDA label are provided by the National Library of Medicine.

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