Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,432 questions · 1,467 findings · 116 reviews · Headline outcomes only

No studies found 232 · 15.8%GRADE not reported 202 · 13.8%Very low 286 · 19.5%Low 327 · 22.3%Moderate 286 · 19.5%High 134 · 9.1%

Antihistamine‐analgesic vs placebo

Adverse effects: drowsiness, hypersomnia, and excessive sleepiness · otherwise healthy adults and children with common cold symptoms

Antihistamine‐analgesic showed no clear difference in adverse effects: drowsiness, hypersomnia, and excessive sleepiness compared with placebo (low certainty).

1 finding from 1 review