Mirtazapine Tablets ( Mirtazapine ) may treat, side effects, dosage, drug interactions, warnings, patient labeling, reviews, and related medications including drug comparison and health resources. Mirtazapine is an antidepressant used to treat major depressive disorder in adults. Learn about its warnings, interactions, pregnancy and breastfeeding advice, and how to take it safely. Point of Care - Clinical decision support for Mirtazapine . Treatment and management. Indications, Mechanism of Action, Administration, Adverse Effects, Contraindications, Monitoring, Toxicity, Enhancing Healthcare Team Outcomes Mirtazapine is an antidepressant that increases certain brain activity to maintain mental balance. It is taken once a day at bedtime and may cause drowsiness, weight gain, and low blood pressure. Learn about its warnings, interactions, and how to take it safely.