Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,756 questions · 13,493 findings · 1,305 reviews · Headline outcomes only

No studies found 2,594 · 19.2%GRADE not reported 728 · 5.4%Very low 2,868 · 21.3%Low 3,777 · 28%Moderate 2,620 · 19.4%High 906 · 6.7%

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Ginkgo biloba vs placebo

Other adverse effects (gastrointestinal upset, headache, allergic reaction) · adults with tinnitus

Ginkgo biloba showed no clear difference in other adverse effects (gastrointestinal upset, headache, allergic… compared with placebo (low certainty).

1 finding from 1 review

Pregabalin 300 mg vs placebo

Patient satisfaction with analgesia ‐ not reported · women having medical abortion before 14 weeks' gestation

Summary of findings table ‐ Pregabalin 300 mg showed no clear difference in patient satisfaction with analgesia compared with placebo (low certainty).

1 finding from 1 review

Pregabalin 300 mg vs placebo

Patient satisfaction with abortion care overall ‐ not reported · women having medical abortion before 14 weeks' gestation

Summary of findings table ‐ Pregabalin 300 mg showed no clear difference in patient satisfaction with abortion care overall compared with placebo (low certainty).

1 finding from 1 review