Menon 1972.

Methods	Allocation: randomly assigned, no further details. Blindness: research workers blind, no further information. Design: 3 parallel groups, single centre. Duration: 10 weeks (preceded by 6 weeks washout). Analysis: intention‐to‐treat. Country: India.
Participants	Diagnosis: schizophrenia (clinical criteria). N=60. Age: range 20‐60 years. Sex: M 30, F 30. Setting: hospital. History: chronic, length of hospitalisation 1.5‐10 years; continuously hospitalised > 1 year. Excluded: mental deficiency and physical complications.
Interventions	1. Trifluoperazine: dose 15 mg/day. N=20. 2. Trifluperidol: dose 1.5 mg/day. N=20. 3. Placebo: N=20. * Antiparkinson drugs if necessary.
Outcomes	Global state: (QPSS scale). Behaviour: (Wings scale). Side effects: (EPS, nausea and vomiting). Unable to use ‐ Laboratory tests ‐ no data.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear