Tiopronin

Tiopronin Uses, Dosage, Side Effects, Food Interaction and all others data.

Tiopronin is a prescription thiol drug used primarily in the treatment of severe homozygous cystinuria. Patients with cystinuria excrete high levels of cystine in their urine and are at risk for kidney stone formation. Tiopronin is used as a second-line therapy to control the rate of cystine precipitation and excretion, and prevent kidney stone formation. It is used after a failure of the non-pharmacological first line treatment consisting of increased fluid intake, restriction of sodium and protein, and urinary alkalinization. As cystinuria is a relatively rare disease, tiopronin is classified as an orphan drug and is not patented in the United States. It is similar to d-penicillamine in use and efficacy, but offers the advantage of far less adverse effects. Tiopronin is dosed on an individual basis using close monitoring of urinary cystine concentrations and urinary output.

Tiopronin may also be used to bind metal nanoparticles in Wilson's disease, which is an overload of copper in the body. It has been investigated for use in the treatment of arthritis and as a neuroprotective agent in aneurysmal subarachnoid hemorrhage.

Trade Name Tiopronin
Availability Prescription only
Generic Tiopronin
Tiopronin Other Names Tiopronin, Tiopronine, Tiopronino, Tioproninum
Related Drugs captopril, Capoten, penicillamine, Cuprimine, Depen, Thiola
Weight 100mg, 300mg, 100mg
Type Oral delayed release tablet, oral tablet
Formula C5H9NO3S
Weight Average: 163.19
Monoisotopic: 163.030314328
Protein binding

Tiopronin undergoes extensive protein binding in plasma. It is thought that this occurs through the formation of a disulphide bridge to the free thiol group of albumin.

Groups Approved, Investigational
Therapeutic Class
Manufacturer
Available Country United States
Last Updated: September 19, 2023 at 7:00 am
Tiopronin
Tiopronin

Uses

Tiopronin is a thiol agent indicated for the prevention of kidney stone formation in patients with severe homozygous cystinuria.

Tiopronin is indicated for the prevention of kidney stone formation in patients with severe homozygous cystinuria consisting of a urinary cystine concentration greater than 500 mg/day, and who have failed treatment with non-pharmacological measures of increased fluid intake, decreased sodium and protein intake, and urine alkalinization.

Tiopronin is also used to associated treatment for these conditions: Kidney stone formation

How Tiopronin works

Kidney stones form when the solubility limit is exceeded and urine becomes supersaturated with endogenous cystine. Tiopronin is an active reducing agent which undergoes a thiol-disulfide exchange with cystine to form a water-soluble mixed disulfide complex. Thus, the amount of sparingly soluble cystine is reduced. By reducing urinary cystine concentrations below the solubility limit, tiopronin helps reduce cystine stone formation.

Toxicity

Long-term carcinogenicity and mutagenicity studies have not been performed with tiopronin. In experimental animal studies, high doses of tiopronin were shown to interfere with the maintenance of pregnancy and viability of a fetus. No neural tube defects were detected when tiopronin was given to mice and rats in doses up to 10 times the highest recommended human dose. However, the manufacturer does not rule out the possibility of teratogenicity, as it has been seen with the drug d-penicillamine, which acts with a similar mechanism to tiopronin. Tiopronin is not recommended for use in breastfeeding mothers and has no established safety in children 9 years old or younger. There have been case reports of tiopronin-related nephropathy.

Food Interaction

  • Take at the same time every day. Take each dose at the same time every day.
  • Take on an empty stomach. Take tiopronin at least 1 hour before or 2 hours after eating food.

Tiopronin Disease Interaction

Moderate: liver disease, renal dysfunction

Volume of Distribution

The volume of distribution of tiopronin is high at 455 L, indicating that a large portion of the drug is bound to tissues outside plasma.

Elimination Route

Tiopronin undergoes slow absorption, reaching peak plasma concentration 3-6 hours after ingestion. In a study of healthy subjects, the bioavailability of total and unbound tiopronin was found to be 63% and 40%, respectively.

Half Life

Tiopronin has a long terminal half life of 53 hours in healthy subjects. However, the unbound drug fraction of tiopronin is eliminated much more rapidly from plasma with a calculated half life of 1.8 hours.

Clearance

Total renal clearance for the total and unbound fractions of tiopronin were found to be 3.3 and 13.3 L/h respectively.

Elimination Route

Tiopronin is 100% excreted in urine.

Innovators Monograph

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*** Taking medicines without doctor's advice can cause long-term problems.
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