Antabus is the brand name of the prescription drug disulfiram. Disulfiram blocks an enzyme that is involved in metabolizing alcohol intake. Disulfiram produces very unpleasant side effects when combined with alcohol in the body. Disulfiram is used in certain people with chronic alcoholism. This medicine can help keep you from drinking because of the unpleasant side effects that will occur if you consume alcohol while taking disulfiram. Disulfiram is used together with behavior modification, psychotherapy, and counseling support to help you stop drinking. This medicine is not a cure for alcoholism.