fenmetramide fenmetramide fenmetramide is a drug which was patented as an antidepressant by mcneil laboratories in the 1960s. the drug was never marketed. it is the 5-ketone derivative of phenmetrazine and would similarly be expected to produce psychostimulant effects, though pharmacological data is lacking. not to be confused with fenmetozole. fenmetramideclinical dataatc codenoneidentifiers iupac name 2-phenyl-3-methyl-morpholin-5-one cas number5588-29-4pubchem cid21789chemspider20479uniiwch9hw127lkeggd04153chemical and physical dataformulac11h13no2molar mass191.230 g·mol−13d model (jsmol)interactive image smiles o=c1nc(c(oc1)c2ccccc2)c