The FDA has approved the first generic version of Tamiflu (oseltamivir phosphate).

Tamiflu is most commonly used to treat influenza A and B in patients aged 2 weeks and older who have experienced flu symptoms for 48 hours or less; the medication can also be used to prevent the flu in patients 1 year and older. The FDA is unsure whether oseltamivir phosphate is effective in patients who began treatment 2 days after initial symptoms developed, or in patients who have weakened immune systems.

The most common side effects of oseltamivir phosphate are nausea and vomiting.

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“Patients must use oseltamivir phosphate as directed by their healthcare provider,” noted the FDA. “Oseltamivir phosphate does not take the place of receiving a flu vaccination.”


  1. The FDA approves first generic version of widely used influenza drug, Tamiflu [news release]. Silver Spring, MD: US Food and Drug Administration. Published August 4, 2016. Accessed August 10, 2016.