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. 2011 Feb 21;2011:0813.
Ref (type) Population Outcome, Interventions Results and statistical analysis Effect size Favours
Adverse effects

Systematic review
166 women with primary dysmenorrhoea
3 RCTs in this analysis
Adverse effects
13/97 (13%) with Chinese herbal medicine
18/69 (26%) with placebo

RR 0.81
95% CI 0.61 to 1.07
Not significant

RCT
78 women with primary dysmenorrhoea Adverse effects (described as inner heat reaction, abnormal menses, PMS-like symptoms, respiratory disorder, and gastrointestinal disorder)
with Chinese herbal medicine (Four Agents Decoction [Si Wu Tang]) for 5 days starting from the onset of bleeding or pain, for 4 cycles
with placebo for 5 days starting from the onset of bleeding or pain, for 4 cycles
Absolute results not reported

Statistical analysis not reported