Derexin is the trade name and generic name for Haloperidol Melitrexed, which may have the adverse effect of decreasing libido. Fluperthiazide melitrexate is an antidepressant that consists of two ingredients: fluperthiazide hydrochloride and melitrexate hydrochloride. It is mainly used to treat patients with mild to moderate depression and anxiety, such as neurasthenia, insidious depression, emotional apathy, agitation and depression in alcohol and drug addicts. Some of the more common adverse effects of the drug are insomnia, restlessness, drowsiness, dizziness, tachycardia, nausea, dyspepsia, rash, and hair loss. There may also be some effects on the genitourinary system, such as poor libido and premature ejaculation. The drug should be contraindicated in people who are allergic to the drug, patients with circulatory failure, patients with central nervous system depression, comatose people, patients with adrenal pheochromocytoma, and patients with untreated closed-angle glaucoma. The medication should be taken under the guidance of a doctor and according to the dosage as prescribed by the doctor, do not use the medication blindly on your own, and if there are any uncomfortable symptoms after using the medication, you should consult a doctor in time.