I would say it's pretty commonly given to the average person, when it shouldn't. For all-comers, it might reduce symptoms by half a day (7 days - 6.5 days) if given within 48 hours of symptom onset. It has no real benefit in the average individual outside of 48 hours, although reasonable in the very high risk group and those being hospitalized.
My practice is to only prescribe it for those meeting the CDC criteria for high risk and are within 48 hours of symptoms onset, and occasionally for those that are adamant about taking it, although they get my spiel about the side effects which are common (GI symptoms are the most common, especially in children).
TL;DR its a terribly ineffective drug and has a lot of annoying side effects, so I reserve it for high risk patients.
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