Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

50 questions · 51 findings · 30 reviews · Headline outcomes only

No studies found 19 · 37.3%GRADE not reported 2 · 3.9%Very low 13 · 25.5%Low 9 · 17.6%Moderate 7 · 13.7%High 1 · 2%

Starting administration of the progestogen earlier vs starting administration of the progestogen later

Other adverse effects · women undergoing embryo transfer with frozen embryos or embryos derived from donor oocytes

The review found no eligible studies for this question.

1 finding from 1 review

Sulthiame vs levetiracetam

Adverse effects (others) · participants with epilepsy (BECTS)

Sulthiame showed no clear difference in adverse effects (others) compared with levetiracetam (low certainty).

1 finding from 1 review

Nifedipine vs placebo

Bothersome adverse effects · primary dysmenorrhoea

It is very uncertain whether nifedipine changes bothersome adverse effects compared with placebo (very low certainty).

1 finding from 1 review