The present invention relates to piperazine derivatives of formula (I), wherein R represents halogen, C1-4 alkyl, trifluoromethoxy or trifluoromethyl; R1 is trifluoromethyl, C1-4 alkyl, C1-4 alkoxy, halogen or trifluoromethoxy; R2 is hydrogen, C1-4alkyl or C2-6alkenyl; R3 represents hydrogen or C1-4alkyl; n and m are independently 0 or an integer from 1 to 3; and pharmaceutically acceptable salts and solvates thereof, process for their preparation and their use in the treatment of condition mediated by tachykinins and/or by selective inhibition of the serotonin reuptake transporter protein.