Pentoxifylline is a classical antipsychotic long-acting oral drug, easily absorbed orally, with a peak concentration at 7 hours of administration and a half-life of 65 to 70 hours, and can be taken once a week. It has a strong antipsychotic effect, light sedative effect, and long duration of action, and is effective in both acute and chronic schizophrenia, especially for maintenance treatment of schizophrenia and for those who refuse to take medication. Currently priced at $14 for a box of 24 capsules, the usual therapeutic dose of 30-60 mg is administered once a week with a maintenance dose of 10-20 mg, starting with half a tablet initially and increasing by 10-20 mg weekly or 2 weeks. it should be used with caution in patients with hepatic insufficiency and should not be combined with other antipsychotics. Contraindications: Basal ganglion lesions, Parkinson’s disease, bone marrow suppression, drug hypersensitivity. Combined with antihypertensive drugs, it may trigger postural hypotension. Common adverse reactions include: extrapyramidal reactions, delayed dyskinesia, drowsiness, dry mouth, fatigue, menstrual disorders, occasional allergic rash, ECG abnormalities, granulocytopenia, malignant syndrome. Specific medication should be administered under medical supervision.