Cysteamin reducerer cystin akkumuleringen i visse celler (f. eks. leukocytter, muskelceller og leverceller) hos patienter med nephropathisk cystinosis, og hvor behandlingen iværksættes tidligt forsinker det udviklingen af nyresvigt.
Cysteamine reduces cystine accumulation in some cells (e. g. leukocytes, muscle and liver cells) of nephropathic cystinosis patients and, when treatment is started early, it delays the development of renal failure.