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What do systematic reviews say?

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Evidence found and GRADE certainty

144 questions · 149 findings · 13 reviews · Headline outcomes only

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No studies found 26 · 17.4%GRADE not reported 6 · 4%Very low 45 · 30.2%Low 49 · 32.9%Moderate 20 · 13.4%High 3 · 2%

Intravenous iron with oral iron vs oral iron

Persistent anaemia symptoms Reported by the women · women with postpartum iron deficiency anaemia

It is very uncertain whether intravenous iron with oral iron changes persistent anaemia symptoms ‐ 1 week Visual Analogue Scale ≥ 7 compared with oral iron (Comparison 6) (very low certainty).

3 findings from 1 review

Oral iron vs placebo (Comparison 3)

All gastrointestinal symptoms Reported by the patients · women with postpartum iron deficiency anaemia

It is very uncertain whether oral iron changes all gastrointestinal symptoms Reported by the patients compared with placebo (Comparison 3) (very low certainty).

1 finding from 1 review

Oral iron sulphate vs oral iron hydroxide polymaltose complex

Serious adverse events ‐ active or inactive disease (14 days) · IBD patients

It is very uncertain whether oral iron sulphate changes serious adverse events ‐ active or inactive disease (14 days) compared with oral iron hydroxide polymaltose complex (very low certainty).

1 finding from 1 review