Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,736 questions · 15,265 findings · 1,163 reviews · Headline outcomes only

No studies found 3,871 · 25.4%GRADE not reported 810 · 5.3%Very low 4,242 · 27.8%Low 3,879 · 25.4%Moderate 1,999 · 13.1%High 464 · 3%

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Intranasal steroid drops vs placebo

Presence of normal olfactory function · participants with olfactory dysfunction following COVID‐19 for ≤ 15 days

Intranasal steroid drops showed no clear difference in presence of normal olfactory function Assessed by participants > 4… compared with placebo (low certainty).

1 finding from 1 review

Intervention not reported

Non‐serious adverse events for all placebos compared with wait‐list or no treatment (Spontaneous reporting of dichotomous outcomes) (Post‐treatment) · patients with mental health disorders

It is very uncertain whether the intervention changes non‐serious adverse events for all placebos compared with wait‐list… (very low certainty).

1 finding from 1 review