Comparison 4. Levetiracetam versus placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Non‐compliance: leaving the study early (before 4 weeks), any reason	1	40	Odds Ratio (M‐H, Fixed, 95% CI)	6.33 [0.67, 60.16]
2 Adverse events, sedation	1	40	Odds Ratio (M‐H, Fixed, 95% CI)	1.52 [0.43, 5.43]
3 Adverse events, dizziness	1	40	Odds Ratio (M‐H, Fixed, 95% CI)	4.75 [0.48, 46.91]
4 Adverse events, headache	1	40	Odds Ratio (M‐H, Fixed, 95% CI)	3.0 [0.51, 17.74]