Makromicin (Azithromycin Dihydrate)

Azithromycin is a macrolide antibiotic that interferes with bacterial protein synthesis, making it effective for several common bacterial infections.

• Community‑acquired pneumonia: eradicates the causative bacteria, leading to clinical recovery and resolution of pulmonary infiltrates.
• Acute bacterial sinusitis: reduces sinus inflammation by eliminating pathogenic bacteria.
• Acute otitis media: clears middle‑ear infection, improving hearing and comfort.
• Pharyngitis/tonsillitis: treats bacterial throat infections, relieving pain and fever.
• Skin and soft‑tissue infections: combats skin pathogens, promoting healing of cellulitis and abscesses.
• Chlamydia trachomatis infection: eliminates the intracellular organism, preventing disease progression.

• Azithromycin binds to the 50S subunit of bacterial ribosomes, blocking the translocation step of protein synthesis. This inhibition prevents the elongation of peptide chains, halting bacterial growth (bacteriostatic) and, at higher concentrations, can be bactericidal. The drug accumulates in tissues, achieving high concentrations at infection sites while maintaining low plasma levels. It also exhibits a long half‑life, allowing once‑daily dosing and a short treatment course.

Azithromycin may cause a range of adverse reactions, most of which are mild and self‑limiting.

Common Side Effects

• Nausea: mild stomach upset often occurring shortly after ingestion.
• Diarrhea: loose stools that may be watery.
• Abdominal pain: cramping or discomfort in the abdomen.
• Headache: transient mild headache.
• Dyspepsia: indigestion or heartburn.
• Vomiting: occasional emesis after dose.

Serious or Rare Side Effects

• QT prolongation: risk of cardiac arrhythmias, especially in patients with pre‑existing heart conditions.
• Severe allergic reaction: hives, swelling, or anaphylaxis requiring immediate medical attention.
• Hepatotoxicity: elevated liver enzymes or jaundice indicating liver injury.
• Clostridioides difficile infection: rare but possible colitis.
• Stevens‑Johnson syndrome: severe skin reaction requiring urgent care.

Before prescribing azithromycin, clinicians should consider several precautionary measures to ensure safe use.

• Assess cardiac history: evaluate risk of QT prolongation, especially with other QT‑prolonging drugs.
• Review liver function: adjust use in patients with hepatic impairment.
• Check renal function: dose adjustment may be needed in severe renal insufficiency.
• Avoid use in known hypersensitivity: discontinue if allergic reactions occur.
• Pregnancy and lactation: use only if benefits outweigh potential risks, after professional assessment.
• Store at ambient temperature: keep below 25 °C, in original container, protected from moisture and light.

Azithromycin can interact with other medicines, altering its efficacy or increasing toxicity.

Major Interactions (Avoid)

• Antacids containing aluminum or magnesium: reduce azithromycin absorption; separate dosing by at least 2 hours.
• Drugs that prolong QT interval (e.g., quinidine, sotalol): increase risk of cardiac arrhythmia.
• Ergot derivatives: may cause ergot toxicity when combined.

Moderate Interactions (Monitor Closely)

• Warfarin: azithromycin may enhance anticoagulant effect; monitor INR.
• Cyclosporine: increased cyclosporine levels; monitor renal function.
• Statins (especially simvastatin): higher risk of myopathy; consider dose adjustment.