In the United States it is a Schedule I Narcotic controlled substance with an ACSCN of 9643 and a 2013 annual aggregate manufacturing quota of zero. The salts in use are the citrate (free base conversion ratio 0.589), hydrobromide (0.773), and hydrochloride (0.883).[4][5]
^Diamond J, Bruce WF, Tyson FT (January 1964). "Synthesis and Properties of the Analgesic DL-α-1,3-dimethyl-4-phenyl-4-propionoxyazacycloheptane (Proheptazine)". Journal of Medicinal Chemistry. 7: 57–60. doi:10.1021/jm00331a013. PMID14186026.