Nomifensine and three selected compounds from the series of H4a, HS-truns, H4,, H9~-cis- 2, 3, 4, 4a, 5, 9b-hexahydro-lH-indeno [1,241 pyridines have been resolved into their enantiomers. All compounds exhibit pronounced enantioselective activity with respect to their inhibition of tetrabenazine-induced ptosis and potentiation of yohimbine toxicity. Nomifensine exhibits the same preference for one enantiomer with respect to dopamine ...