Tiopronin CAS NO.1953-02-2

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Tiopronin is used primarily for cystinuria and is well known in the cystinuric community. Depending on the severity of a person's cystinuria, tiopronin may be taken for life, possibly starting in early childhood. The drug works by reacting with urinary cysteine to form a more soluble, disulfide linked, tiopronin-cysteine complex.^[3]

It may also be used for Wilson's disease (an overload of copper in the body), and has also been investigated for the treatment of arthritis,^[4][5] though tiopronin is not an anti-inflammatory.

Tiopronin is also sometimes used as a stabilizing agent for metal nanoparticles. The thiol group binds to the nanoparticles, preventing coagulation.^[6]