Cysteamine works by reducing the amount of cystine (an amino acid) in the kidneys. Cysteamine is used to treat nephropathic cystinosis (NEF-roe-PATH-ik SIS-tin-OH-sis), a rare genetic condition that causes a build-up of cystine in the kidneys. Too much cystine can cause kidney failure or other medical problems. Cysteamine may also be used for other purposes not listed in this medication guide.
Cystagon is used by medical practitioners for managing nephropathic cystinosis, which is a very rare kidney disease. Cystagon is a cysteine-depleting agent. This drug basically functions by reducing the amount of cystine in the body. It is advised that patients avoid using this drug if they are allergic to any component or substance that can be found in the drug such as penicillamine.