Levofloxacine Zydus (Levofloxacin)

Levofloxacin is a fluoroquinolone antibacterial that targets bacterial DNA replication in various respiratory, urinary and skin infections.

• Community‑acquired pneumonia: Improves clinical cure rates by eradicating susceptible Streptococcus pneumoniae and other pathogens.
• Acute bacterial sinusitis: Reduces sinus inflammation and infection symptoms caused by Streptococcus pneumoniae, Haemophilus influenzae and Moraxella catarrhalis.
• Acute exacerbation of chronic bronchitis: Provides bacterial eradication to alleviate worsening cough and sputum production.
• Skin and soft‑tissue infections: Treats cellulitis, abscesses and wound infections caused by Staphylococcus aureus and Streptococci.
• Urinary tract infections: Eliminates common uropathogens such as Escherichia coli to resolve cystitis and pyelonephritis.

• Levofloxacin exerts its antibacterial effect by inhibiting the bacterial enzymes DNA gyrase (topoisomerase II) and topoisomerase IV. These enzymes are essential for supercoiling and separation of replicated DNA. Inhibition prevents bacterial replication and transcription, leading to cell death. The drug has high affinity for both Gram‑negative and Gram‑positive organisms, providing broad‑spectrum activity. By targeting these critical steps, levofloxacin achieves rapid bactericidal activity even against resistant strains.

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

Common Side Effects

• Nausea: mild stomach upset, occasional vomiting.
• Diarrhea: loose stools with abdominal cramping.
• Headache: dull to moderate tension‑type pain.
• Dizziness: light‑headedness or vertigo.
• Insomnia: difficulty falling or staying asleep.
• Rash: mild skin redness or itching.

Serious or Rare Side Effects

• Tendon rupture: sudden tear of Achilles or other tendons.
• QT prolongation: lengthened cardiac repolarization, risk of arrhythmia.
• Severe allergic reaction: anaphylaxis with swelling, hives, breathing difficulty.
• Peripheral neuropathy: numbness, tingling or weakness in limbs.
• Clostridioides difficile infection: severe colitis with watery diarrhea.
• Hepatotoxicity: liver enzyme elevation or hepatitis.

When prescribing levofloxacin, clinicians should consider several precautionary measures to minimize risks.

• Renal impairment: adjust therapy and monitor kidney function.
• History of tendon disorders: avoid use or use with caution in patients with prior tendon injury.
• Cardiac risk: assess QT interval and avoid in patients with known prolongation.
• Concomitant corticosteroids: monitor for increased tendon rupture risk.
• Pregnancy and lactation: evaluate benefit‑risk ratio; use only if clearly needed.
• Store at ambient temperature: keep tablets below 25 °C in original packaging, protected from moisture.

Levofloxacin can interact with several medicines, altering its efficacy or safety profile.

Major Interactions (Avoid)

• Antacids with magnesium/aluminum: decrease levofloxacin absorption.
• Iron supplements: markedly lower oral bioavailability.
• Warfarin: may increase anticoagulant effect and bleeding.
• Cyclosporine: levofloxacin can raise cyclosporine levels.
• Insulin or sulfonylureas: risk of enhanced hypoglycemia.

Moderate Interactions (Monitor Closely)

• NSAIDs: may raise risk of CNS stimulation or seizures.
• Theophylline: levofloxacin can increase its serum concentration.
• Caffeine or clozapine (CYP1A2 substrates): possible higher plasma levels.
• Oral contraceptives: reduced effectiveness, consider backup method.
• Sulfonylureas: monitor for possible increased hypoglycemia.