Levofloxacin (Levofloxacin Hemihydrate)

• Levofloxacin is indicated for several bacterial infections affecting respiratory, urinary, skin, and intra‑abdominal systems.
• Community‑acquired pneumonia: eradicates the causative bacteria, improving respiratory function.
• Acute bacterial sinusitis: resolves sinus infection and relieves congestion.
• Acute bacterial exacerbation of chronic bronchitis: reduces bacterial load and shortens symptom duration.
• Skin and soft tissue infections: eliminates pathogenic bacteria, promoting wound healing.
• Urinary tract infections: clears urinary pathogens, relieving dysuria and frequency.
• Prostatitis: treats bacterial prostatitis, alleviating pelvic pain and urinary symptoms.
• Intra‑abdominal infections: controls polymicrobial infection, supporting recovery after surgery.

• Levofloxacin inhibits bacterial DNA gyrase (topoisomerase II) and topoisomerase IV, enzymes essential for DNA supercoiling and separation during replication and transcription. By binding to the enzyme‑DNA complex, it blocks the resealing step, causing DNA breaks and resulting in bactericidal activity against Gram‑negative and Gram‑positive organisms.

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

Common Side Effects

• Nausea: mild gastrointestinal upset.
• Diarrhea: loose stools, sometimes watery.
• Headache: transient cranial discomfort.
• Dizziness: occasional vertigo or light‑headedness.
• Rash: mild skin erythema.

Serious or Rare Side Effects

• Tendon rupture: especially Achilles, may occur during or after therapy.
• QT prolongation: cardiac rhythm disturbance requiring monitoring.
• Severe hypersensitivity: anaphylaxis or Stevens‑Johnson syndrome.
• Clostridioides difficile colitis: severe intestinal infection.
• Central nervous system effects: seizures or psychosis.

When prescribing Levofloxacin, clinicians should consider several safety and handling precautions.

• Renal impairment: adjust dose or monitor renal function.
• History of tendon disorders: avoid use or monitor for pain.
• Cardiac arrhythmias: avoid in patients with QT prolongation risk.
• Concomitant CNS active drugs: monitor for seizures or confusion.
• Pregnancy and lactation: use only if benefits outweigh risks, as safety is unknown.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Levofloxacin can interact with other medicines, altering efficacy or safety.

Major Interactions (Avoid)

• Antacids containing aluminum or magnesium: reduce absorption; separate dosing by at least 2 hours.
• Warfarin: may increase INR, requiring closer monitoring.
• NSAIDs (e.g., ibuprofen): heightened risk of CNS stimulation and seizures.

Moderate Interactions (Monitor Closely)

• Theophylline: may increase serum levels, watch for toxicity.
• Cyclosporine: increased cyclosporine concentrations, monitor levels.
• Diabetic agents (e.g., insulin, sulfonylureas): may cause hypoglycemia, monitor glucose.