Norfloxacine Sandoz (Norfloxacin)

Norfloxacin is used to treat bacterial infections affecting several organ systems.

• Urinary tract infections: eradicates susceptible uropathogens, relieving symptoms and preventing recurrence.
• Prostatitis: eliminates causative bacteria, improving prostate inflammation and clinical outcomes.
• Gastrointestinal infections: combats susceptible enteric pathogens, aiding resolution of diarrhea and abdominal discomfort.
• Respiratory tract infections: targets susceptible respiratory bacteria, supporting recovery from bronchitis and pneumonia.

• Norfloxacin exerts its antibacterial effect by binding to bacterial DNA gyrase (topoisomerase II) and topoisomerase IV, enzymes essential for DNA supercoiling and replication. Inhibition of these enzymes prevents DNA strand separation, halting bacterial DNA synthesis and transcription, which leads to bacterial cell death. The drug displays concentration‑dependent bactericidal activity against a broad range of Gram‑negative and some Gram‑positive organisms species.

Norfloxacin may cause adverse reactions ranging from mild to severe.

Common Side Effects

• Nausea: mild stomach upset occurring shortly after dosing, usually resolves without treatment.
• Diarrhea: loose stools that may be self‑limiting but can cause dehydration if persistent.
• Headache: transient cranial discomfort, generally mild and improves with rest.
• Rash: mild skin erythema or itching, occasionally developing into a maculopapular rash.

Serious or Rare Side Effects

• Tendon rupture: sudden tendon pain or rupture, especially in the Achilles, requiring urgent care.
• QT interval prolongation: cardiac rhythm changes that may lead to arrhythmia in susceptible patients.
• Severe allergic reactions: anaphylaxis, angioedema, or Stevens‑Johnson syndrome, demanding immediate medical attention.
• Clostridioides difficile infection: severe colitis after gut flora disruption, presenting with profuse watery diarrhea.

When prescribing norfloxacin, clinicians should observe several precautionary measures to ensure safe use.

• Renal impairment: adjust dose or avoid use in patients with severe renal dysfunction.
• Hypersensitivity: do not use in individuals with known allergy to fluoroquinolones or related compounds.
• Pregnancy and lactation: avoid unless benefits outweigh potential risks, as safety data are limited.
• Tendon health: discontinue promptly if patient experiences tendon pain, swelling, or inflammation.
• Concomitant CNS disorders: use caution in patients with a history of seizures or psychiatric conditions.
• Store at ambient temperature: keep below 25 °C, in the original packaging, protected from moisture and light.

Norfloxacin can interact with other medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Antacids containing magnesium or aluminum: reduce norfloxacin absorption, leading to therapeutic failure.
• Warfarin: may increase INR and bleeding risk; close monitoring required.
• Cyclosporine: can raise cyclosporine concentrations, increasing nephrotoxicity.

Moderate Interactions (Monitor Closely)

• Theophylline: may raise serum theophylline levels, risking toxicity.
• Non‑steroidal anti‑inflammatory drugs (NSAIDs): combined use can increase risk of CNS stimulation and seizures.
• Corticosteroids: concurrent therapy may heighten risk of tendon rupture.