Campbell 1982a.

Methods	4‐week trial haloperidol versus placebo
Participants	Inclusion criteria: meet the DSM criteria for autism Exclusion criteria: not reported Location/Setting: appears to be in the USA Number of participants randomly assigned: 40 in total Number of withdrawals/dropouts: Gender: not reported Mean age: 4.7 years (range 2.3‐7.9 years) IQ: not reported Concomitant medications: not reported History of previous medications: not reported
Interventions	Intervention (haloperidol): mean 1.12 mg/day (0.5 mg‐3.0 mg/day) Comparator (placebo): equivalent placebo
Outcomes	No relevant outcomes reported (behaviours were stereotypies, fidgeting, hyperactivity, and withdrawal)
Notes	Comment: insufficient information provided and scales used were not relevant (CGI, Children's Psychiatric Rating Scale)