Do you still need flu medicine if you've had the flu shot?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Yes, you can still get the flu even after receiving a flu shot, and you may need antiviral flu medication to treat it. While the flu vaccine significantly reduces your risk of infection and severe illness, it doesn't offer 100% protection. Flu shots are designed to target the strains predicted to be most common each season, but circulating viruses can vary, and individual immune responses differ.

If you develop flu symptoms despite being vaccinated, prescription antiviral medications like oseltamivir (Tamiflu) can shorten the illness and reduce complications—especially when started within 48 hours of symptom onset.

Not sure whether what you're feeling is the flu, a cold, or something else entirely? Getting clarity early can make a real difference in how quickly you recover and whether you need antivirals. Take a free, instant, online symptom check to better understand your symptoms and get personalized guidance on your next steps—no appointment or sign-up required.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Getting a flu shot is a great way to help protect yourself from getting the flu, but it doesn't guarantee you won't get sick. Sometimes, people who have had the flu shot can still catch the flu. This is because the flu virus can change, and the vaccine might not match perfectly with the virus going around.

Why You Might Need Medicine:

If You Get Sick: If you do catch the flu even after getting the shot, doctors might give you flu medicine. This can help you feel better faster and make the flu not as bad.
Protection for Others: Taking flu medicine can also help stop the spread of the flu to other people, especially those who might get really sick from it.

Remember: The flu shot is still very important. It helps protect you and others by making it less likely you'll get sick, and if you do, the illness is often milder. But if you're experiencing symptoms and aren't sure whether it's the flu or something else, try our free AI symptom checker to better understand what might be causing your discomfort and whether you should seek medical care.

(References)

Drinka PJ. (2003). Influenza vaccination and antiviral therapy: is there a role .... Drugs & aging, 12578397.
Committee on Infectious Diseases. (2024). Recommendations for Prevention and Control of Influenza .... Pediatrics, 39183669.
Grohskopf LA, Alyanak E, Broder KR, Blanton LH, Fry AM, Jernigan DB, & Atmar RL. (2020). Prevention and Control of Seasonal Influenza with .... MMWR. Recommendations and reports : Morbidity and mortality weekly report. Recommendations and reports, 32820746.

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