moxastine moxastine moxastine (also known as mephenhydramine) is an antihistamine and anticholinergic. moxastineclinical dataahfs/drugs.cominternational drug namesatc codenoneidentifiers iupac name 2--n,n-dimethylethanamine cas number3572-74-5 ypubchem cid19142chemspider18062 nuniizsj254w6sfcomptox dashboard (epa)dtxsid60189244 echa infocard100.020.626 chemical and physical dataformulac18h23nomolar mass269.388 g·mol−13d model (jsmol)interactive image smiles cc(c1=cc=cc=c1)(c2=cc=cc=c2)occn(c)c inchi inchi=1s/c18h23no/c1-18(20-15-14-19(2)3,16-10-6-4-7-11-16)17-12-8-5-9-13-17/h4-13h,14-15h2,1-3h3 nkey:bbimhfspnxqfah-uhfffaoysa-n n ny (what is this?) (verify) it was developed in czechoslovakia and sold in hydrochloride form as an antihistamine (alfadryl). it is, with 8-chlorotheophylline, a component of cocrystal/salt moxastine teoclate (mephenhydrinate) used as antiemetic (theadryl; kinedryl (with caffeine)).