Disulfiram is an alcohol-abuse deterrent. It works by blocking the breakdown of alcohol, causing unpleasant side effects (eg, vomiting, upset stomach) when even a small amount of alcohol is consumed.

Disulfiram implant dosage forms contain a prescription drug and are exempt from the Federal Food, Drug, and Cosmetic Act (the regulating the FDA, Food and Drug Administration). See 20 C.F.R. § 312.3(o)(4)(ii), (p). See the FDA's public health advisory concerning sildenafil: www.fda.gov/Drugs/DrugSafety/ucm068294.htm Note: Since sildenafil is sold without labeling as Viagra, the FDA does not require additional labeling for its sale. FDA regulations do not require the inclusion of sildenafil tablets in a prescription drug product. See 21 C.F.R. §§ 351.1 to 351.23. Manufacture of sildenafil by an electronic drug formulation process (EPDP) is exempt from the Federal Food, Drug, and Cosmetic Act (the regulating the FDA, Food and Drug Administration), as the manufacturer does not have to meet the prescription drug requirements of act. See 20 C.F.R. § 312.3(o)(4)(v). In addition, FDA regulations exempt the manufacture and sale of sildenafil by EPDPs. See 21 C.F.R. §§ 351.17 to 351.