Cystamine is an unstable liquid and is generally handled as the dihydrochloride salt, C4H12N2S2·2HCl, which is stable to 203-214 °C at which point it decomposes.
Cistamin je nestabilna tečnost i njime se generalno rukuje u obliku dihidrohloridne soli, C4H12N2S2·2HCl, koja je stabilna do 203-214 °C, na kojoj temparaturi se razlaže.