Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,490 questions · 1,526 findings · 124 reviews

No studies found 263 · 17.2%GRADE not reported 224 · 14.7%Very low 292 · 19.1%Low 327 · 21.4%Moderate 286 · 18.7%High 134 · 8.8%

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