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What do systematic reviews say?

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Evidence found and GRADE certainty

3,024 questions · 3,338 findings · 330 reviews

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No studies found 735 · 22%GRADE not reported 282 · 8.4%Very low 962 · 28.8%Low 870 · 26.1%Moderate 384 · 11.5%High 105 · 3.1%

Interventions (vitamin B1, mefenamic acid, tranexamic acid) vs placebo or active comparators (desmopressin, sodium diclofenac, flavonoids)

Duration of bleeding (menstrual diary)
2 findings from 1 review

Interventions (vitamin B1, mefenamic acid, tranexamic acid) vs placebo or active comparators (desmopressin, sodium diclofenac, flavonoids)

Menstrual blood loss: mean loss
2 findings from 1 review

Primary health professional‐led psychological interventions vs usual care or no treatment

Adverse events (RR > 1 denotes greater risk of harm) · adults with post‐traumatic stress or common mental disorders

It is very uncertain whether primary health professional‐led psychological interventions changes adverse events (RR > 1 denotes greater risk of harm) compared with usual or no care (very low certainty).

1 finding from 1 review