Influenza

In general, early therapy is preferred over routine pre-exposure and post-exposure prophylaxis.

Optimal benefits are obtained if treatment is initiated as early as possible after the onset of symptoms. Hospitalized patients may still benefit from treatment even if initiated later than 48 hours following symptom onset.

Public Heath Ontario (PHO) Antiviral Medications for Seasonal Influenza:
Information for Health Care Providers, 2019