The present invention concerns the use of a mixture of enantiomers enriched in the dextrogyral enantiomer of milnacipran and/or of at least one of its metabolites, as well as their pharmaceutically-acceptable salts, for the preparation of a drug intended to prevent or to treat disorders that can be managed by double inhibition of serotonin (5-HT) and norepinephrine (NE) reuptake, while limiting the risks of cardiovascular disturbances and/or organ and/or tissue toxicity.