How long does tamiflu stay in the body?

Tamiflu (oseltamivir) has a half-life of about 6 to 10 hours in healthy adults, meaning it takes that long for half of the drug to be eliminated from the body. It generally takes about 5 to 6 half-lives for a drug to be considered effectively cleared, so Tamiflu can remain in the body for about 1 to 2 days after the last dose. However, individual factors like age, kidney function, and overall health can influence this duration.