halazepam halazepam halazepam is a benzodiazepine derivative that was marketed under the brand names paxipam in the united states, alapryl in spain, and pacinone in portugal. halazepamclinical dataother names9-chloro-6-phenyl-2-(2,2,2-trifluoroethyl)-2,5-diazabicycloundeca-5,8,10,12-tetraen-3-oneahfs/drugs.commicromedex detailed consumer informationmedlineplusa684001pregnancycategory ? routes ofadministrationoralatc coden05ba13 (who) legal statuslegal status ca: schedule iv de: prescription only (anlage iii for higher doses) us: schedule iv pharmacokinetic datametabolismhepaticelimination half-life14 hours (halazepam), 50–100 hours (metabolites).excretionrenalidentifiers iupac name 7-chloro-5-phenyl-1-(2,2,2-trifluoroethyl)-3h-1,4-benzodiazepin-2-one cas number23092-17-3 ypubchem cid31640iuphar/bps7195drugbankdb00801 ychemspider29343 yunii320yc168lfkeggd00338 ychemblchembl970 ycomptox dashboard (epa)dtxsid5023118 echa infocard100.041.281 chemical and physical dataformulac17h12clf3n2omolar mass352.74 g·mol−13d model (jsmol)interactive image smiles fc(f)(cn1c(cn=c(c2=cc=cc=c2)c3=c1c=cc(cl)=c3)=o)f inchi inchi=1s/c17h12clf3n2o/c18-12-6-7-14-13(8-12)16(11-4-2-1-3-5-11)22-9-15(24)23(14)10-17(19,20)21/h1-8h,9-10h2 ykey:wyclkvqlvuqknz-uhfffaoysa-n y (verify) medical uses halazepam was used for the treatment of anxiety. adverse effects adverse effects include drowsiness, confusion, dizziness, and sedation. gastrointestinal side effects have also been reported including dry mouth and nausea. pharmacokinetics and pharmacodynamics pharmacokinetics and pharmacodynamics were listed in current psychotherapeutic drugs published on june 15, 1998 as follows: onset of actionintermediate to slow plasma half life14 hr for parent drug and 30-100 hr for its metabolite peak plasma levels1-3 hr for parent drug and 3-6 hf for its metabolite metabolismmetabolized into desmethyldiazepam and 3-hydroxyhalazepam (in the liver) excretionexcreted through kidneys protein binding98% bound to plasma protein regulatory information halazepam is classified as a schedule 4 controlled substance with a corresponding code 2762 by the drug enforcement administration (dea). commercial production halazepam was invented by schlesinger walter in the u.s. it was marketed as an anti-anxiety agent in 1981. however, halazepam is not commercially available in the united states because it was withdrawn by its manufacturer for poor sales.