Levofloxacin
Tablet or injection
Quick Summary
Levofloxacin is effective against many bacteria, including some that cause pneumonia and drug-resistant TB, but has rare serious side effects.
Medical Uses
How it's taken
Separate doses from antacids, iron and calcium.
Take it for the full course, even if you feel better, unless your doctor tells you otherwise. Don't share antibiotics or keep leftovers.
Your doctor decides the right dose for you. Follow their instructions and the label.
Common Side Effects
Nausea
Diarrhoea.
Dizziness
And headache.
Tendon pain
Seek advice.
Interactions
Antacids and supplements
Reduce absorption.
Diabetes medicines
Can cause high or low blood sugar.
Critical Warnings
Tendon damage
Black Box Warning: Risk of rupture, especially with steroids or in older people.
Heart rhythm
Can affect rhythm in people at risk.
Severe allergic reaction
Black Box Warning: Swelling of the face or throat, difficulty breathing or a widespread rash: get emergency help.
Antibiotic resistance
Using antibiotics when they aren't needed makes them less effective for everyone.
Sources and further reading
Last updated 21 October 2026. For more detail, see these trusted health organisations.
- Levofloxacin: drug information(opens in a new tab) · MedlinePlus, US National Library of Medicine