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Butorphanol is a morphinan-type synthetic opioid analgesic. Brand name Stadol was recently discontinued by the manufacturer. It is now only available in its generic formulations. Butorphanol is most closely structurally related to levorphanol. Butorphanol is available as the tartrate salt in injectable, tablet, and intranasal spray formulations. The tablet form is only used in dogs and cats due to low bioavailability in humans.

Butorphanol is listed under the Single Convention on Narcotic Drugs 1961 and in the United States is a Schedule IV Narcotic controlled substance with a DEA ACSCN of 9720; being in Schedule IV it is not subject to annual aggregate manufacturing quotas. The free base conversion ratio of the hydrochloride is 0.69

On Oct, 16, 2015: 160 people reported to have side effects when taking Butorphanol tartrate. Among them, 3 people (1.88%) have Hallucination.