In November 2010, the United States Food and Drug Administration (FDA) withdrew all medications that contain propoxyphene from the market. It has been determined that the risks of propoxyphene outweigh the possible benefits. In particular, the FDA was concerned about the drug's ability to cause serious changes in the heart rhythm, even at normal doses. Pharmacies will no longer sell this medication, and people who take it should stop and ask their healthcare provider for a more suitable pain medication.
Propoxyphene (one of the active ingredients in Darvocet) is classified as a mild, centrally-acting, narcotic pain reliever. "Centrally-acting" means that it works in the central nervous system (the brain and spinal cord). Propoxyphene is chemically related to
methadone.
The other active ingredient in Darvocet is acetaminophen (commonly known as "APAP"). It is a pain reliever and fever reducer commonly found in non-prescription medications such as Tylenol. Adding acetaminophen to propoxyphene increases the effectiveness for relieving pain and also provides fever-reducing properties.