Abstract: The present disclosure is directed towards administering a biologically effective amount of a thiomolybdate compound to a patient who demonstrates either depressive or aggressive behavior. According to the present disclosure, thiomolybdate compounds can be administered orally, sublingually, intravascular, intraperitoneal, intradermal, intramuscular, or via any other known administrative techniques. Administration of the thiomolybdate compound lowers the blood serum copper level in the patient, thereby reducing the efficacy of the copper levels which helped cause the onset or postpartum depression or aggression.