THE INVENTION RELATES TO THE USE OF TETRAHYDROQUINOLINE DERIVATIVES OF FORMULA I WHEREIN R1 AND R2 EACH INDEPENDENTLY REPRESENT (C1-C4)ALKOXY, R3 REPRESENTS ARYL-(C1-C4)ALKYL OR HETEROARYL-(C1-C4)ALKYL, AND R4 REPRESENTS HYDROGEN OR (C1-C4)ALKYL, OR OF PHARMACEUTICALLY ACCEPTABLE SALTS THEREOF, FOR THE PREPARATION OF A MEDICAMENT FOR PREVENTING OR TREATING POST-TRAUMATIC STRESS DISORDERS.