Methyl diethyldithiocarbamate is an active metabolite of the aldehyde dehydrogenase inhibitor disulfiram . It is produced by methylation of the disulfiram metabolite diethyldithiocarbamate in mouse liver microsomes. Methyl diethyldithiocarbamate inhibits liver low Km aldehyde dehydrogenase (ALDH) in rats (ID50 = 15.5 mg/kg). It decreases mean arterial pressure (MAP) and increases heart rate during ethanol challenge in rats when administered at a dose of 20.6 mg/kg.