octatropine methylbromide octatropine methylbromide octatropine methylbromide (inn) or anisotropine methylbromide (usan), trade names valpin, endovalpin, lytispasm and others, is a muscarinic antagonist and antispasmodic. it was introduced to the u.s. market in 1963 as an adjunct in the treatment of peptic ulcer, and promoted as being more specific to the gastrointestinal tract than other anticholinergics, although its selectivity was questioned in later studies. octatropine methylbromideclinical dataother names8-methyltropinium bromide 2- propylvalerateroutes ofadministrationoralatc codenonepharmacokinetic databioavailability10 to 25% (oral)protein bindingunknownmetabolismhepaticelimination half-lifeunknownidentifiers iupac name (endo)-8,8-dimethyl-8-azoniabicyclooctan-3-yl] 2-propylpentanoate bromide cas number80-50-2 ypubchem cid6647drugbankdb00517 ychemspider10482228 nunii62m960dhilkeggd00232 ychemblchembl1186610 ncomptox dashboard (epa)dtxsid8022612 echa infocard100.001.169 chemical and physical dataformulac17h32brno2molar mass362.352 g·mol−13d model (jsmol)interactive image smiles cccc(ccc)c(=o)o1c2cc(c1)2(c)c. inchi inchi=1s/c17h32no2.brh/c1-5-7-13(8-6-2)17(19)20-16-11-14-9-10-15(12-16)18(14,3)4;/h13-16h,5-12h2,1-4h3;1h/q+1;/p-1/t14-,15+,16+; nkey:qsfkgmjokuzajm-cnkdkajdsa-m n ny (what is this?) (verify) octatropine has been superseded by more effective agents in the treatment of peptic ulcer disease, and is no longer used. it is still sold in some countries in combination with other drugs, such as phenobarbital and metamizole.