Abstract: The invention provides the preparation procedure for N-substituted derivatives of N-methyl-3-(p-trifluoromethylphenoxy)-3 -phenylpropylamine having the general formula (I), where R is hydrogen and the group of the general formula (II), in which R.sub.1 is aryl, alkylaryl and alkyl group with C.sub.1 to C.sub.4 atoms, and n is 0 and 1, and also covers the compounds of the general formula (I), where R is the group of the formula (II), in which R.sub.1 is aryl and alkylaryl group, and n is 0 and 1.According to this invention by condensation of N-substituted derivatives of N-methyl-3-phenyl-3-hydroxypropylamine (XV), where R.sub.1 is benzyl and p-nitrobenzyl group and n is 0, and p-trifluoromethylchlorbenzene (XVI) prepared N-substituted derivatives of N-methyl-3-(p-trifluoromethylphenoxy)-3 -phenylpropylamine (I), where R is the group of the formula (II), in which n and R are the same as in the compound (XV), which by the reaction with chloroformic acid esther (XVII), where R.sub.