Makcin (Clarithromycin)

Clarithromycin is employed to treat bacterial infections affecting the respiratory tract, sinuses, skin and gastrointestinal system.

• Community‑acquired pneumonia: eradicates the causative bacteria and improves lung function.
• Acute bacterial sinusitis: reduces sinus inflammation and clears infection.
• Acute bacterial exacerbations of chronic bronchitis: shortens symptom duration and prevents complications.
• Skin and soft‑tissue infections: eliminates pathogenic organisms and promotes wound healing.
• Helicobacter pylori eradication regimens: used in combination therapy to achieve bacterial clearance and reduce ulcer recurrence.

• Clarithromycin inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit, blocking translocation of the peptidyl‑tRNA. This action prevents elongation of the nascent peptide chain, halting bacterial growth and leading to a bacteriostatic effect against susceptible organisms.

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

Common Side Effects

• Nausea: mild to moderate stomach upset.
• Diarrhea: frequent loose stools.
• Abdominal pain: cramping or discomfort.
• Taste disturbance: altered or metallic taste.
• Headache: mild to moderate intensity.
• Vomiting: occasional episodes.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction requiring immediate medical attention.
• QT prolongation: potential cardiac arrhythmia risk.
• Clostridioides difficile‑associated diarrhea: severe colitis.
• Hepatic dysfunction: elevated liver enzymes or jaundice.
• Cardiac arrhythmias: irregular heart rhythms beyond QT changes.
• Severe skin reactions: such as Stevens‑Johnson syndrome.

Before initiating clarithromycin therapy, consider the following precautions.

• Assess renal function: adjust use in patients with impaired kidney function.
• Monitor liver enzymes: watch for hepatic toxicity during treatment.
• Avoid in known macrolide hypersensitivity: discontinue if allergic reaction occurs.
• Evaluate QT interval: perform ECG in patients at risk of cardiac arrhythmias.
• Use with caution in pregnancy: only if benefits outweigh potential risks.
• Store at room temperature: keep in the original container, protect from moisture.

Clarithromycin interacts with several medicines; some require avoidance while others need monitoring.

Major Interactions (Avoid)

• Cisapride: may cause serious cardiac arrhythmias.
• Pimozide: increased risk of QT prolongation.
• Terfenadine: risk of fatal cardiac events.

Moderate Interactions (Monitor Closely)

• Statins (e.g., simvastatin): increased plasma concentrations.
• Warfarin: enhanced anticoagulant effect.
• Theophylline: elevated serum levels leading to toxicity.