Pharmaceutical preparations for the treatment of diseases mediated by an opioid receptor, namely, major depressive disorder, chronic depression, severe unipolar recurrent major depressive episodes, dysthymic disorder, depressive neurosis and neurotic depression, melancholic depression, atypical depression, reactive depression, treatment resistant depression, seasonal affective disorder and pediatric depression, premenstrual syndrome, premenstrual dysphoric disorder, hot flashes, bipolar disor...