RÉSUMÉ
Treatment effect of maprotiline at different doses [50-150 mg/d] as a tetracyclic antidepressant, with major effects on NEP and less anticholinergic side effects compared to some other tricyclic medications, has been compared with other medications. Given ethical and cultural differences as well as pharmacokinetic characteristics between Iranian populations, the current study was carried out to determine the effect of different doses of maprotiline in treatment of moderate MDD, its therapeutic ratio and related side effects in each dose, and also to define the effective dose of maprotiline. This quasi-experimental study was performed on the patients with moderate MDD who referred to psychiatry clinics. Thirty cases were selected from the patient with age between 25- 50 years, with 20