Azithromycin Dosage for Adults & Kids in India: Complete Guide (2026)

AAzithromycin is a macrolide antibiotic - one of the most commonly prescribed antibiotics in India for throat infection (tonsillitis), sinusitis, bronchitis, pneumonia, typhoid, chlamydia, and skin infections. Common Indian brands: Azithral 500 (Alembic, ₹72/strip of 5), Azee 500 (Cipla, ₹78), Azax 500 (Mankind, ₹65), Azibact, Zithromax. Azithromycin kills bacteria by stopping them from making proteins. It does NOT work for viral infections (cold, flu, COVID). Taking it for viral illness is why India has antibiotic resistance problems. Only take on doctor's prescription.

Standard adult dosing (body weight 40kg+): Day 1: 500mg once. Days 2-5: 250mg once daily. OR 500mg once daily for 3 days. Total course: 3 or 5 days depending on infection. For typhoid: 500mg twice daily × 7 days (higher dose). For chlamydia: single 1000mg dose (2 tablets at once). Take 1 hour before or 2 hours after food - food reduces absorption by 43%. Pair with ORS if you have diarrhea. Do not stop early even if you feel better on day 2 - incomplete course = resistant bacteria next time.

For children, dose is calculated by weight: 10mg/kg body weight once daily × 3 days. Azithral 200mg/5ml syrup (₹65/30ml bottle) is standard in India. Quick weight-based chart: 5 kg kid → 2.5ml once daily × 3 days. 10 kg → 5ml. 15 kg → 7.5ml. 20 kg → 10ml. 25 kg → 12.5ml. 30 kg → 15ml. Always use the measuring cup/dropper that comes with the bottle - NEVER a kitchen spoon (household teaspoons vary 3-7ml). Give on empty stomach or 2 hours after food. Shake bottle well before each dose.

Most common: stomach upset (20%), nausea (15%), diarrhea (10%), vomiting (8%). These usually settle in 2-3 days. Take with curd/probiotic drink (Yakult ₹13/bottle) to protect gut flora. Less common: headache, taste disturbance (metallic taste), dizziness. Rare but serious: irregular heartbeat (QT prolongation) - stop immediately and see doctor if you feel heart racing, fainting. Allergic reaction - rash, itching, swelling of lips/tongue. Liver issues (jaundice) in prolonged use. Fungal infections in women (vaginal thrush) - talk to doctor if itching develops.

Serious interactions: Antacids (Gelusil, Digene) - reduce absorption, take 2 hours apart. Warfarin (blood thinner) - increases bleeding risk, INR monitoring needed. Digoxin (heart medicine) - levels increase, toxicity risk. Statins (atorvastatin, simvastatin) - muscle pain risk. Ergot derivatives (migraine meds) - serious interaction. OTC to avoid: grapefruit juice, alcohol (worsens stomach upset). Azithromycin is generally safe with paracetamol (Dolo) and ibuprofen (Brufen). Tell your doctor EVERY medicine you take, including Ayurvedic (some churna interact).

Absolute contraindications: known allergy to macrolides (erythromycin, clarithromycin, roxithromycin). Relative caution needed: heart rhythm problems (long QT syndrome), severe liver disease, myasthenia gravis (muscle weakness disease), low potassium/magnesium levels. Pregnancy: Category B - generally safe, used if benefit outweighs risk. Breastfeeding: small amount in milk, usually OK. Elderly (65+): need ECG if heart condition. Kids under 6 months: doctor must calculate exact dose.

Azithromycin vs Amoxicillin (Mox/Augmentin): Amoxicillin is first-choice for most ear/throat infections. Azithromycin is used when patient is penicillin-allergic OR for atypical pneumonia (Mycoplasma). Azithromycin vs Doxycycline: Doxycycline is first-line for scrub typhus, rickettsia, acne. Azithromycin is better for community-acquired pneumonia, typhoid. Azithromycin vs Ciprofloxacin: Cipro for UTI, traveler's diarrhea. Azithromycin for respiratory, chlamydia. Don't self-switch antibiotics - the bacteria being treated dictate choice.

Store tablets below 30°C in dry place. Syrup: after opening, use within 10 days; do NOT refrigerate (may crystallize); keep in room temp away from sunlight. Missed dose: take as soon as remembered. If it's near the time of next dose, skip missed one - never double up. If you vomit within 30 min of taking, re-take the dose. If after 30 min, don't repeat. Finishing the course is non-negotiable - stopping at day 2 of 5 is why resistance builds in your body.