Pharmacological properties and acute toxicity of 2-tolyl 1-phenyl-3-(2-methylpiperidino) propyl ether methyl bromide (R111) and 2-chlorophenyl 1-phenyl-3-(2-methylpiperidino) propyl ether methyl iodide (R97) were examined. The results obtained were as follows: (1) In the analgesic effects, RIII and R97 inhibited markedly the acetic acid-induced writhing in mice, but in reducing pain induced by heat, R111 and R97 showed negative results. The local anesthetic effect of R111 was approximately equal to that of procaine. R111 and R97 showed no effects on spontaneous locomotion, the convulsion induced by strychnine or pentetrazol, and normal body temperature. (2) R111 and R97 antagonized acetylcholine, barium chloride, nicotine and serotonine-induced spasm, but not that of histamine and bradykinin. In particular they possessed marked anti-barium chloride activity, where their effects were 20 to 30 times more active than that of papaverine. (3) R111 and R97 indicated weak mydriatic activity. (4) R111 and R97 showed inhibitory effects on the pilocarpine-induced sialic secretion and the propulsive movements of the small intestine, but their inhibitory effects on the gastric secretion were relatively weak. (5) R111 and R97 displayed protective effects in Shay's ulcer, but had no curative effects on acetic acid ulcer. (6) R111 and R97 induced temporary reduction of arterial blood pressure and blood flow immediately after the administration of the test compounds in anesthetized rabbits. However, these agents induced no change in ECG, heart rate and respiration. (7) Intraperitoneally administered R111 and R97 were effective in inhibiting the carrageenin-induced edema in the hind paw of rats. From the above results, it may be considered that R111 and R97 have together strong cholinergic blocking and muscotropic antispasmodic effects, moreover, no significant effects on the central nervous system.