Leflokin (Levofloxacin)

Levofloxacin is a fluoroquinolone antibiotic used to treat bacterial infections affecting several organ systems.

• Respiratory tract infections: effective against community‑acquired pneumonia and acute exacerbations of chronic bronchitis.
• Urinary tract infections: treats uncomplicated cystitis and pyelonephritis caused by susceptible organisms.
• Skin and soft tissue infections: combats cellulitis, wound infections, and abscesses.
• Sinusitis: resolves acute bacterial sinus infections.
• Prostatitis: used for bacterial prostatitis when oral therapy is appropriate.

• Levofloxacin inhibits bacterial DNA gyrase (topoisomerase II) and topoisomerase IV, enzymes essential for DNA replication, transcription, and repair. By binding to these enzymes, it prevents the resealing of DNA strands after cleavage, leading to accumulation of double‑strand breaks and bacterial cell death. This mechanism provides broad‑spectrum activity against Gram‑positive, Gram‑negative, and atypical pathogens.

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

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Diarrhea: loose stools, sometimes watery.
• Headache: transient cranial discomfort.
• Dizziness: sensation of light‑headedness or unsteadiness.
• Insomnia: difficulty falling or staying asleep.
• Rash: mild skin erythema or itching.

Serious or Rare Side Effects

• Tendon rupture: sudden pain or swelling, especially in the Achilles tendon.
• QT interval prolongation: may lead to cardiac arrhythmias.
• Severe allergic reactions: anaphylaxis, angioedema, or Stevens‑Johnson syndrome.
• Clostridioides difficile infection: severe colitis with watery diarrhea.
• Peripheral neuropathy: tingling, numbness, or weakness in extremities.
• Hepatotoxicity: elevated liver enzymes or jaundice.

Before prescribing Leflokin, clinicians should consider several safety measures.

• Assess renal function: adjust dose in patients with impaired clearance.
• Evaluate hypersensitivity: avoid use in individuals with known fluoroquinolone allergy.
• Monitor for tendon pain: discontinue if signs of tendonitis or rupture appear.
• Use caution in cardiac patients: may prolong QT interval and precipitate arrhythmias.
• Review concomitant medications: avoid drugs that increase risk of tendon injury.
• Store at ambient temperature: keep below 25°C in the original packaging, protected from moisture.

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

Major Interactions (Avoid)

• Antacids containing aluminum or magnesium: reduce levofloxacin absorption.
• Warfarin: may increase INR and bleeding risk.
• Theophylline: elevated plasma levels can cause toxicity.

Moderate Interactions (Monitor Closely)

• Other fluoroquinolones (e.g., ciprofloxacin): additive QT prolongation.
• NSAIDs: may increase risk of central nervous system adverse effects.
• Diabetes medications: may affect glucose control, requiring monitoring.