Abstract: Propargylamine derivatives having the general formula: ##STR1## wherein R is a hydrogen atom, an unsubstituted phenyl group or a phenyl group substituted with halogen, trifluoromethyl, loweralkoxy, nitro, cyano, amido or N,N-diloweralkylamido, R.sub.1, R.sub.2 or R.sub.3 are the same or different and each represent a hydrogen atom or a loweralkyl group, R.sub.4 is a hydrogen atom or a loweralkyl, benzyl, phenethyl or furyl group, or R.sub.3 and R.sub.4 together with the nitrogen atom to which they are attached form a piperidinyl group, and their pharmaceutically acceptable acid addition salts, have been found to be useful in the treatment of anxiety, psychotic states and aggressive behavior in affected animals.