This prescription drug, which is sold under the name Antabuse, is used to treat alcoholism. It causes an extremely unpleasant reaction if the person taking the drug drinks even a tiny amount of alcohol. It works by blocking the oxidation of alcohol at the acetaldehyde stage.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.