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Typical (low-potency) antipsychotic

Chlorpromazine hydrochloride

Brand names: Largactil

Adult dose

Dose: Schizophrenia: 75mg/day in divided doses, increasing to 300mg/day (max 1g/day). IM 25–50mg every 6–8h for acute disturbance
Route: PO/IM
Frequency: TDS-QDS

Clinical pearls

  • Low D2 affinity, high anticholinergic and antihistaminergic — sedating
  • Photosensitivity: advise sun protection

Contraindications

  • CNS depression
  • Coma
  • Bone marrow suppression
  • Phaeochromocytoma

Side effects

  • Sedation
  • Hypotension
  • Anticholinergic effects
  • Photosensitivity
  • Cholestatic jaundice
  • NMS
  • EPSE
  • QT prolongation

Interactions

  • Other QT-prolonging drugs
  • Levodopa (antagonism)
  • CNS depressants

Monitoring

  • BP
  • FBC
  • LFTs
  • ECG
  • Glucose/lipids

Reference: BNF; https://bnf.nice.org.uk/drugs/chlorpromazine-hydrochloride/. Verify against your local formulary and the latest BNF before prescribing.

Related

Curated clinical cross-links plus same-class fallbacks.