Active Ingredient

Norfloxacin

Norfloxacin is an antibiotic that belongs to the fluoroquinolone class of medications. It is used to treat various bacterial infections in adults.

It works by stopping the growth of bacteria, helping to clear the infection from the body.

Written By Douglas C. Goldberg, MD

Reviewed By Philip Schein, MD

Last Updated 28 Nov 2025

Available Norfloxacin Brands

Noroxin

Strengths 400mg

Norfloxacin Uses

Norfloxacin is typically used to treat a range of bacterial infections. These can include:

Urinary tract infections
Prostatitis (inflammation of the prostate gland)
Gastrointestinal infections
Some types of sexually transmitted infections

How Norfloxacin Works

Norfloxacin works by inhibiting bacterial DNA gyrase and topoisomerase IV, enzymes necessary for bacterial DNA replication, transcription, repair, and recombination.

By interfering with these enzymes, norfloxacin prevents bacteria from multiplying and repairing themselves, which helps to eliminate the infection.

Common side effects of Norfloxacin

Not everyone experiences side effects with norfloxacin, and many are mild and temporary. Common side effects can include:

Nausea
Diarrhea
Dizziness
Headache
Stomach pain
Insomnia

If you experience serious or persistent symptoms, contact your doctor promptly.

Avoid taking norfloxacin with dairy products or calcium-fortified drinks.
Stay hydrated and drink plenty of fluids while taking this medication.
Avoid excessive sun exposure and use sunscreen, as norfloxacin can make your skin more sensitive to sunlight.
Inform your doctor if you experience tendon pain or swelling.
Avoid heavy alcohol consumption while on this medication.

Always consult your doctor for personalized medical advice and before making any changes to your medication regimen.

Frequently Asked Questions

What is norfloxacin used for?

Norfloxacin is used to treat bacterial infections such as urinary tract infections, prostatitis, and certain gastrointestinal infections.

How long does it take for norfloxacin to work?

The time it takes for norfloxacin to work can vary, but patients may start to feel better within a few days. It’s important to complete the full course as prescribed.

Can I take norfloxacin with food?

Norfloxacin should be taken on an empty stomach, either 1 hour before or 2 hours after a meal, for best absorption.

Are there any foods or drinks I should avoid while taking norfloxacin?

Avoid taking norfloxacin with dairy products or calcium-fortified drinks, as these can interfere with the absorption of the medication.

Is norfloxacin safe for everyone?

Norfloxacin is not suitable for everyone. It’s important to discuss your medical history with your doctor to ensure it’s safe for you.