What it's for (Indications)
- Norfloxacin is a fluoroquinolone antibiotic primarily used for the treatment of various bacterial infections.
- Key indications include: Uncomplicated and complicated urinary tract infections (UTIs) including cystitis, pyelonephritis, and chronic bacterial prostatitis.
- It is also used for traveler's diarrhea and certain sexually transmitted infections (though its use for STIs has declined due to evolving resistance patterns).
Dosage Information
| Type | Guideline |
|---|---|
| Standard | Oral administration. **Adults (typically aged 18 years and older):** * **Uncomplicated Urinary Tract Infections (UTIs):** 400 mg orally twice daily for 3 to 10 days. * **Complicated Urinary Tract Infections (UTIs):** 400 mg orally twice daily for 10 to 21 days. * **Prostatitis:** 400 mg orally twice daily for 28 days. * **Traveler's Diarrhea:** 400 mg orally twice daily for 1-3 days. **Renal Impairment:** Dosage adjustment is necessary for patients with impaired renal function (creatinine clearance ≤ 30 mL/min/1.73 m²). A typical adjustment is 400 mg orally once daily. Specific local guidelines in Pakistan or US FDA may require slight variations or more precise adjustments based on individual patient parameters. |
Safety & Warnings
Common Side Effects
- Common side effects include nausea, headache, dizziness, abdominal pain, and diarrhea.
- More serious and less common adverse reactions may include: Tendinitis and tendon rupture (especially Achilles tendon), peripheral neuropathy (which can be irreversible), central nervous system effects (e.
- g.
- , seizures, psychosis, confusion, anxiety, depression, insomnia, hallucinations), QT prolongation, Clostridium difficile-associated diarrhea (CDAD), hypersensitivity reactions (e.
- g.
- , anaphylaxis, Stevens-Johnson syndrome), photosensitivity/phototoxicity, dysglycemia (hypo- or hyperglycemia), and hepatic dysfunction.
Serious Warnings
- Black Box Warning: Yes. Fluoroquinolones, including norfloxacin, are associated with disabling and potentially irreversible serious adverse reactions that have occurred together, including tendinitis and tendon rupture, peripheral neuropathy, and central nervous system effects (e.g., seizures, psychosis, hallucinations). Other serious risks include aortic aneurysm and dissection, hypoglycemia, and mental health side effects. Due to these risks, norfloxacin should be reserved for use in patients who have no alternative treatment options for uncomplicated urinary tract infections, acute bacterial exacerbation of chronic bronchitis, and acute sinusitis. (Note: Norfloxacin is generally not indicated for bronchitis or sinusitis and is less commonly used for uncomplicated UTIs in some regions due to these risks and resistance patterns).
- Norfloxacin carries significant warnings due to the potential for disabling and potentially irreversible serious adverse reactions.
- These include: 1.
- **Tendinitis and Tendon Rupture**: Increased risk, especially in patients over 60, those on corticosteroids, and organ transplant recipients.
- Discontinue at the first sign of tendon pain or inflammation.
- 2.
- **Peripheral Neuropathy**: Sensory or sensorimotor axonal polyneuropathy affecting small and/or large axons, potentially irreversible.
- Discontinue if symptoms of peripheral neuropathy (pain, burning, tingling, numbness, weakness) occur.
- 3.
- **Central Nervous System Effects**: Seizures, increased intracranial pressure, toxic psychosis, anxiety, confusion, depression, hallucinations, and insomnia.
- Use with caution in patients with known or suspected CNS disorders.
- 4.
- **Aortic Aneurysm and Dissection**: Increased risk, particularly in elderly patients.
- 5.
- **Hypoglycemia**: Can cause severe, symptomatic hypoglycemia, especially in diabetic patients on oral hypoglycemic agents or insulin.
- 6.
- **QT Prolongation**: Avoid in patients with known QT prolongation, uncorrected hypokalemia, or concurrent use of other QT-prolonging drugs.
- 7.
- **Clostridium difficile-associated Diarrhea (CDAD)**: Can range from mild diarrhea to fatal colitis.
- 8.
- **Hypersensitivity Reactions**: Serious and sometimes fatal, including anaphylaxis.
- Discontinue at first sign of rash or other hypersensitivity.
- 9.
- **Photosensitivity/Phototoxicity**: Advise patients to avoid excessive sunlight or artificial UV light.
- 10.
- **Myasthenia Gravis Exacerbation**: Avoid in patients with a history of myasthenia gravis due to potential for exacerbation of muscle weakness.
- 11.
- **Arthralgia/Arthropathy**: Not recommended for use in pediatric patients due to the risk of irreversible cartilage damage.
How it Works (Mechanism of Action)
Norfloxacin is a synthetic broad-spectrum fluoroquinolone antibacterial agent. It acts by inhibiting bacterial DNA gyrase (topoisomerase II) and topoisomerase IV, essential enzymes involved in bacterial DNA replication, transcription, repair, and recombination. This inhibition leads to the disruption of DNA synthesis and ultimately results in bactericidal activity.
Commercial Brands (Alternatives)
No other brands found for this formula.