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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Nifedipine vs placebo

Relief of pain · primary dysmenorrhoea

It is very uncertain whether nifedipine changes pain relief (any) compared with placebo (very low certainty).

1 finding from 1 review

Nifedipine vs placebo

Good or excellent pain relief · primary dysmenorrhoea

It is very uncertain whether nifedipine changes good or excellent pain relief compared with placebo (very low certainty).

1 finding from 1 review

Nifedipine vs placebo

Health‐related quality of life · primary dysmenorrhoea

The review found no eligible studies for this question.

1 finding from 1 review

Nifedipine vs placebo

Total adverse effects · primary dysmenorrhoea

It is very uncertain whether nifedipine changes total adverse effects compared with placebo (very 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

Nifedipine vs placebo

Requirement for additional medication · primary dysmenorrhoea

It is very uncertain whether nifedipine changes requirement for additional medication compared with placebo (very low certainty).

1 finding from 1 review