Olfactory dysfunction is a common problem that is most frequently attributed to upper respiratory infection.

Postviral olfactory dysfunction (PVOD) can be prolonged and clinically challenging to treat. Olfactory training (OT) has demonstrated potential benefit for patients with nonspecific olfactory dysfunction.

We sought to evaluate the efficacy of OT specifically for PVOD by pooled analysis of the existing evidence.

Following PRISMA guidelines, PubMed, Embase, and Web of Science databases were queried and abstracts screened independently by 2 investigators.

We included studies evaluating the efficacy of OT for PVOD and excluded studies evaluating pharmacologic interventions or olfactory loss from other causes.