Overview
Sulpiride is an atypical antipsychotic medication primarily used for the treatment of schizophrenia and other psychotic disorders. It functions as a selective dopamine D2 and D3 receptor antagonist with additional antidepressant and anxiolytic properties. The drug is available in various oral formulations and requires careful monitoring due to potential neurological and metabolic side effects.
Mechanism of Action
Sulpiride acts as a selective antagonist at dopamine D2 and D3 receptors, particularly in the mesolimbic pathway, which reduces positive symptoms of psychosis. Unlike typical antipsychotics, it has lower affinity for other dopamine receptors and minimal anticholinergic effects, contributing to its atypical profile with reduced extrapyramidal symptoms at therapeutic doses.
Indications
- Treatment of schizophrenia
- Management of acute and chronic psychotic disorders
- Adjunctive therapy for depression with psychotic features
- Treatment of anxiety disorders in some regions (off-label)
Common Doses
- 50 mg
- 100 mg
- 200 mg
- 400 mg
Dosage
Initial adult dosage typically ranges from 200-400 mg twice daily, titrated based on response and tolerability up to 800-1200 mg daily in divided doses. Elderly patients and those with renal impairment require lower starting doses and careful titration.
Contraindications
- Known hypersensitivity to sulpiride or any component
- Pheochromocytoma
- Concurrent use with levodopa
- Severe hepatic impairment
- History of neuroleptic malignant syndrome
Side Effects
- Extrapyramidal symptoms (dystonia, akathisia, parkinsonism)
- Hyperprolactinemia (galactorrhea, amenorrhea, gynecomastia)
- Sedation and drowsiness
- Weight gain
- Orthostatic hypotension
- Anticholinergic effects (dry mouth, constipation)
- Rare but serious: neuroleptic malignant syndrome, seizures, agranulocytosis
Interactions
- Enhanced CNS depression with alcohol, benzodiazepines, and opioids
- Increased risk of QT prolongation with other QT-prolonging drugs
- Reduced efficacy when combined with dopamine agonists
- Potential interaction with CYP2D6 inhibitors
- Antihypertensive effects may be potentiated
Counseling Points
- Take with food to minimize gastrointestinal upset
- Avoid alcohol and CNS depressants
- Report any involuntary movements immediately
- Monitor for signs of infection (fever, sore throat)
- Rise slowly from sitting/lying positions to prevent dizziness
- Do not stop medication abruptly without medical supervision