Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Vomiting
RCT	30 women admitted to hospital In review	Proportion of women vomiting 48 hours 1/15 (7%) with ondansetron 10 mg in 50 mL intravenous solution over 30 minutes 3/15 (20%) with promethazine 50 mg in 50 mL intravenous solution over 30 minutes	RR 0.33 95% CI 0.04 to 2.85 The RCT was too small to draw reliable conclusions		Not significant