Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Adverse effects
RCT	30 women admitted to hospital In review	Sedation 0/15 (0%) with ondansetron 10 mg in 50 mL intravenous solution over 30 minutes 8/15 (53%) with promethazine 50 mg in 50 mL intravenous solution over 30 minutes	P = 0.002	Effect size not calculated	ondansetron