Levofloxacin Noridem (Levofloxacin)

Levofloxacin is a fluoroquinolone antibiotic used to treat infections caused by susceptible bacteria.

• Community‑acquired pneumonia: eradicates the causative pathogens and improves respiratory symptoms.
• Complicated urinary tract infections: clears infection and prevents recurrence in the urinary system.
• Skin and soft tissue infections: reduces bacterial load and promotes wound healing.
• Acute bacterial sinusitis: relieves sinus inflammation and eliminates the infecting organisms.
• Acute exacerbations of chronic bronchitis: improves lung function and reduces bacterial burden.

• Levofloxacin exerts antibacterial activity by binding to bacterial DNA gyrase (topoisomerase II) and topoisomerase IV, enzymes essential for DNA supercoiling, replication, and transcription. Inhibition of these enzymes halts DNA synthesis, leading to rapid bacterial cell death. The drug shows concentration‑dependent killing and a post‑antibiotic effect against a broad spectrum of Gram‑negative and Gram‑positive organisms.

Levofloxacin may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Nausea: mild stomach upset that may resolve without treatment.
• Diarrhea: loose stools that are usually self‑limiting.
• Headache: transient cranial discomfort.
• Rash: mild skin erythema or itching.

Serious or Rare Side Effects

• Tendon rupture or tendinitis: sudden pain and loss of function, especially in the Achilles tendon.
• QT interval prolongation: cardiac rhythm changes that can lead to arrhythmia.
• Severe hypersensitivity reactions: including anaphylaxis or Stevens‑Johnson syndrome.
• Clostridioides difficile‑associated diarrhea: severe colitis requiring medical attention.

Before initiating therapy with Levofloxacin, several precautions should be considered to minimize risks.

• Renal function assessment: adjust therapy in patients with impaired renal clearance.
• Caution in elderly: increased risk of tendon injury.
• Avoid in patients with known hypersensitivity to fluoroquinolones.
• Monitor QT interval: use cautiously with other QT‑prolonging agents.
• Use only when indicated: limit exposure to reduce resistance development.
• Store at ambient temperature: keep in original container, protect from light and moisture.

Levofloxacin can interact with other medicines, requiring careful review of a patient’s medication list.

Major Interactions (Avoid)

• Antacids containing aluminum or magnesium: reduce levofloxacin absorption.
• Warfarin: may increase anticoagulant effect and bleeding risk.
• Non‑steroidal anti‑inflammatory drugs (NSAIDs): increase risk of CNS stimulation and seizures.

Moderate Interactions (Monitor Closely)

• Other fluoroquinolones or drugs that prolong QT: additive effect on cardiac repolarisation.
• Theophylline: may raise plasma levels and cause toxicity.
• Cyclosporine: may increase levofloxacin concentrations, requiring dose adjustment.