DESCRIPTION. PAXIL is an orally administered psychotropic drug.It is the hydrochloride salt of a phenylpiperidine compound identified chemically as -trans-4R--3S-[ methyl] piperidine hydrochloride hemihydrate and has the empirical formula of C 19 H 20 FNO 3 •HCl•½H 2 O. Note: This document contains side...