1. Clinical Overview
A fixed-dose combination (FDC) of a broad-spectrum fluoroquinolone antibiotic (Levofloxacin) and a mucolytic/expectorant agent (Ambroxol). Levofloxacin acts by inhibiting bacterial DNA gyrase and topoisomerase IV, providing bactericidal activity against a wide range of Gram-positive and Gram-negative pathogens. Ambroxol enhances the secretion of respiratory tract fluid, reduces mucus viscosity, and stimulates surfactant production, facilitating expectoration and improving airway clearance. This combination is primarily indicated for the treatment of acute bacterial exacerbations of chronic bronchitis and community-acquired pneumonia where tenacious sputum is a complicating factor.
| Onset | Duration | Bioavailability |
|---|---|---|
| Levofloxacin: Antibacterial effect begins within hours of administration. Ambroxol: Mucolytic effect typically observed within 30-60 minutes. | Levofloxacin: Approximately 24 hours, supporting once-daily dosing. Ambroxol: Effects last 8-12 hours. | Levofloxacin: ~99% (oral). Ambroxol: ~70-80% (oral). |
2. Mechanism of Action
Levofloxacin: Inhibits bacterial DNA gyrase (in Gram-negative bacteria) and topoisomerase IV (in Gram-positive bacteria), enzymes essential for DNA replication, transcription, repair, and recombination. This inhibition leads to double-stranded DNA breaks and rapid bacterial cell death (bactericidal). Ambroxol: Depolymerizes acid mucopolysaccharide fibers in sputum, reducing viscosity. It also stimulates type II pneumocytes to produce surfactant and enhances the activity of the ciliary transport system, improving mucociliary clearance.
3. Indications & Uses
- Acute bacterial exacerbation of chronic bronchitis (ABECB)
- Community-acquired pneumonia (CAP) of mild to moderate severity with tenacious sputum
4. Dosage & Administration
Adult Dosage: One tablet (Levofloxacin 500mg + Ambroxol 75mg) once daily. For CAP/ABECB: Duration typically 7-14 days.
Administration: Take with a full glass of water, with or without food (to minimize GI upset). Avoid taking with dairy products, calcium-fortified juices, or antacids containing divalent cations (Al, Mg, Ca, Fe, Zn) as they significantly reduce levofloxacin absorption. Maintain at least a 2-hour gap. Stay well-hydrated.
5. Side Effects
Common side effects may include:
- Nausea
- Diarrhea
- Headache
- Dizziness
- Dyspepsia
- Mild skin rash
6. Drug Interactions
| Drug | Effect | Severity |
|---|---|---|
| Antacids (Al, Mg), Sucralfate, Iron, Zinc, Calcium | Markedly reduced absorption of Levofloxacin due to chelation | Major |
| NSAIDs (e.g., Ibuprofen, Diclofenac) | Increased risk of CNS stimulation and seizures | Moderate |
| Corticosteroids (e.g., Prednisolone) | Increased risk of tendon rupture | Major |
| Oral Anticoagulants (Warfarin) | Enhanced anticoagulant effect; increased INR | Moderate |
| Antiarrhythmics (Amiodarone, Sotalol), Antipsychotics | Additive QT prolongation, high risk of arrhythmias | Major |
| Theophylline | Increased theophylline levels; risk of toxicity | Moderate |
| Probenecid | Reduces renal clearance of Levofloxacin, increasing its levels | Moderate |
| CYP3A4 Inhibitors (e.g., Ketoconazole) | May increase Ambroxol levels | Minor |
7. Patient Counselling
- DO complete the full course even if you feel better.
- DO take with plenty of water and stay well-hydrated.
- DO separate dose from antacids, vitamins/minerals, or dairy by at least 2 hours.
- DONT skip doses.
- DONT share this medicine with anyone else.
- DONT take for viral infections like common cold or flu.
8. Toxicology & Storage
Overdose: Nausea, vomiting, CNS excitation (tremors, agitation, seizures), prolongation of QT interval, renal impairment. Ambroxol overdose may cause GI distress and neurological symptoms.
Storage: Store below 30°C, in a cool, dry place, protected from light and moisture. Keep out of reach of children. Do not use after the expiry date printed on the pack.