Mathur 1981.

Methods	Allocation: randomly assigned, cross‐over design (after 6months). Blinding: double, given by hospital pharmacist in individual bottles. Duration: 16 months.
Participants	Diagnosis: schizophrenia. N=24. Age: mean 55 yrs. Sex: unknown. History: in hospital mean 27 yrs, stable on chlorpromazine >6 months. Setting: hostel.
Interventions	1. Chlorpromazine cessation: placebo. N=12. 2. Chlorpromazine continuation: (dose not reported). N=12.
Outcomes	Relapse. Leave the study early. Unable to use ‐ Death: 1 suicide (not reported by group). Behaviour: 1 person threatening (not reported by group). Global state: deterioration (not reported by group). Urine tests for the presence of phenothiazine. no data.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Unclear risk	B ‐ Unclear