Levofloxacin Fresenius Kabi (Levofloxacin)

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

• Community‑acquired pneumonia: achieves clinical cure and bacterial eradication in typical cases.
• Hospital‑acquired pneumonia: effective against resistant pathogens in severe respiratory infections.
• Complicated urinary tract infections: resolves infection and prevents recurrence.
• Complicated intra‑abdominal infections: supports surgical and medical management of polymicrobial infections.
• Skin and soft tissue infections: clears bacterial involvement in cellulitis and abscesses.
• Acute bacterial sinusitis: reduces symptoms and promotes sinus clearance.

• Levofloxacin inhibits bacterial DNA gyrase (topoisomerase II) and topoisomerase IV, enzymes essential for DNA replication, transcription, and repair. By stabilizing the enzyme‑DNA complex, it prevents strand re‑ligation, leading to lethal double‑strand breaks and bacterial cell death. The drug exhibits concentration‑dependent bactericidal activity against a broad spectrum of Gram‑positive and Gram‑negative organisms.

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

Common Side Effects

• Nausea: transient gastrointestinal upset.
• Diarrhea: may be watery and self‑limiting.
• Headache: mild to moderate intensity.
• Dizziness: occasional vertigo or light‑headedness.
• Rash: mild skin erythema or pruritus.
• Elevated liver enzymes: transient laboratory changes.

Serious or Rare Side Effects

• Tendon rupture: especially Achilles, requiring immediate discontinuation.
• QT interval prolongation: risk of ventricular arrhythmias.
• Clostridioides difficile infection: severe colitis may develop.
• Severe allergic reactions: anaphylaxis, angioedema.
• Stevens‑Johnson syndrome/toxic epidermal necrolysis: life‑threatening skin reactions.
• Peripheral neuropathy: persistent sensory deficits.

Levofloxacin requires careful assessment before use to minimize risks.

• Assess renal function: adjust dosing in patients with impaired clearance.
• Monitor for tendon pain or swelling: discontinue if symptoms appear.
• Avoid use in patients with known hypersensitivity to fluoroquinolones.
• Use with caution in pregnancy (Category C): only if benefits outweigh potential risks.
• Avoid concomitant QT‑prolonging drugs: monitor cardiac rhythm.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Levofloxacin can interact with several medicines, influencing safety and efficacy.

Major Interactions (Avoid)

• Antacids containing aluminum or magnesium: reduce levofloxacin absorption.
• Warfarin: may increase INR, requiring close coagulation monitoring.
• Co‑administration with other fluoroquinolones: heightened tendon toxicity risk.
• Drugs that prolong QT interval (e.g., macrolides, antiarrhythmics): increase arrhythmia potential.

Moderate Interactions (Monitor Closely)

• Corticosteroids: elevate tendon rupture risk, monitor musculoskeletal symptoms.
• Theophylline: may raise plasma levels, watch for toxicity signs.
• Cyclosporine: can increase levofloxacin concentrations, adjust dosing as needed.