Do antibiotics work for viral infections?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Antibiotics do not work against viral infections in most cases. Antibiotics are designed to target bacteria, not viruses, which means they are ineffective for illnesses like the common cold, flu, or COVID-19. However, there are rare exceptions where a doctor may prescribe antibiotics during a viral illness—typically when a secondary bacterial infection develops alongside the virus.

If you're feeling unwell and unsure whether your symptoms point to a viral or bacterial infection, guessing can lead to unnecessary medication use or delayed treatment. Taking the wrong approach may prolong your illness or contribute to antibiotic resistance. The smartest next step is to get clarity on what's actually going on. Try this free, instant, online symptom check to better understand your condition and confidently navigate your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Antibiotics are medicines used to treat infections caused by bacteria, not viruses. In most cases, antibiotics do not work against viral infections such as colds or the flu. However, there are certain situations where antibiotics may be considered for viral infections, always under medical supervision.

Repositioning of Antibiotics: Some studies explore using antibiotics in new ways. For example, certain antibiotics might help in viral infections by reducing inflammation or preventing bacterial complications.
Azithromycin: This specific antibiotic has been studied for its potential effects in viral infections. It might help in certain cases by having some anti-inflammatory properties.
Caution Needed: While there are exceptions, using antibiotics for viral infections should be done carefully and under medical advice to avoid unnecessary side effects and antibiotic resistance.

If you're experiencing symptoms and unsure whether you need medical attention, try Ubie's free symptom checker to help determine your next steps. In general, antibiotics should not be used for viral infections unless specifically recommended by a healthcare professional for a particular reason.

(References)

Bustos-Hamdan A, Bracho-Gallardo JI, Hamdan-Partida A, & Bustos-Martínez J. (2024). Repositioning of Antibiotics in the Treatment of Viral .... Current microbiology, 39460768.
Au TY, Assavarittirong C, Benjamin S, & Wiśniewski OW. (2023). Is there a correlation between antibiotic use and the .... Clinical and experimental medicine, 37653183.
Oliver ME, & Hinks TSC. (2021). Azithromycin in viral infections. Reviews in medical virology, 32969125.

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