Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

143 questions · 148 findings · 21 reviews · ENT

No studies found 67 · 45.3%GRADE not reported 0 · 0%Very low 59 · 39.9%Low 16 · 10.8%Moderate 6 · 4.1%High 0 · 0%

Systemic corticosteroids plus intranasal steroid/mucolytic/decongestant vs no intervention

Psychophysical testing for recovery of sense of smell · adults with olfactory dysfunction for ≥ 4 weeks following COVID‐19 infection

It is very uncertain whether systemic corticosteroids plus intranasal… changes psychophysical testing for recovery of sense of smell compared with no intervention (very low certainty).

1 finding from 1 review

Palmitoylethanolamide and luteolin vs no intervention

Recovery of sense of smell (as · adults with olfactory dysfunction for ≥ 4 weeks following COVID‐19 infection

It is very uncertain whether palmitoylethanolamide and luteolin changes recovery of sense of smell (as compared with no intervention (very low certainty).

1 finding from 1 review

Intranasal steroid spray vs placebo or no intervention

Presence of normal olfactory function · people with olfactory dysfunction for less than 4 weeks following COVID‐19 infection

It is very uncertain whether intranasal steroid spray changes presence of normal olfactory function Assessed by participants as a… compared with no intervention/placebo (very low certainty).

2 findings from 1 review

Intranasal steroid spray vs placebo or no intervention

Change in sense of smell · people with olfactory dysfunction for less than 4 weeks following COVID‐19 infection
3 findings from 1 review