Imbeloni 1986.

Study characteristics
Methods	RCT
Participants	Pregnant women at term undergoing CS under epidural anaesthesia. N = 80 women randomised
Interventions	Group 1: dopamine antagonist (Comparison 2) Metoclopramide 20 mg IV. N = 40 women randomised. Group 2: placebo Normal saline 4 mL. N = 40 women randomised.
Outcomes	Nausea and vomiting.
Notes	Setting: Rio de Janeiro, Brazil. Dates: not reported in English abstract Funding source: not reported in English abstract. Declaration of interest: not reported in English abstract. This study currently provides no data for the review because for 'nausea + vomiting' data are unclear if the data are for intraoperative or postoperative. We wrote to the authors in 2009 to request further information but had no response.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Women were divided into groups randomly."
Allocation concealment (selection bias)	Unclear risk	Not described.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not stated.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not stated.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	None described.
Selective reporting (reporting bias)	Unclear risk	We did not assess the trial protocol.
Other bias	Low risk	No apparent baseline differences.