Azithromycin Dosage: What You Need to Know

Azithromycin is a popular antibiotic that treats a range of infections, from a sore throat to pneumonia. Getting the dose right matters – too little may not clear the bug, too much can cause unwanted side effects. Below you’ll find the most common dosing schedules, how to tweak them for special situations, and tips to stay safe while taking this medicine.

Standard Adult Dosage

For most adults, doctors prescribe one of three simple regimens:

• Single‑dose regimen: 1,000 mg (a 2‑tablet dose) taken once, usually for uncomplicated chlamydia.
• Five‑day regimen: 500 mg on day 1, then 250 mg once daily on days 2‑5. This pattern works for many respiratory infections, skin infections, and ear infections.
• Three‑day regimen: 500 mg once daily for three days. It’s less common but sometimes used for bronchitis.

Take each pill with or without food – azithromycin isn’t picky, but a glass of water helps it reach your stomach quickly.

Special Cases and Precautions

Pediatric dosing: Children get a weight‑based amount, typically 10 mg per kilogram of body weight on day 1, then 5 mg/kg on days 2‑5. For a 30‑kg kid, that’s a 300 mg first dose followed by 150 mg each day.

Kidney or liver problems: If you have reduced kidney function, the doctor may lower the total dose or stretch the schedule. Don’t change the amount on your own – ask your pharmacist.

Drug interactions: Azithromycin can boost the levels of some heart meds (like certain anti‑arrhythmics) and may cause stomach upset if taken with antacids that contain aluminum or magnesium. Space those out by at least two hours.

Missed dose: If you forget a pill, take it as soon as you remember, unless it’s almost time for the next dose. In that case, skip the missed one – don’t double up.

Side‑effect checklist: Common issues include mild diarrhea, nausea, or a slight headache. Persistent belly pain, severe rash, or an irregular heartbeat need immediate medical attention.

Finishing the full course, even if you feel better after a couple of days, is crucial. Stopping early can let the infection come back and may encourage resistance.

In short, follow the exact schedule your doctor writes, adjust only under professional guidance, and watch for any unusual reactions. When you stick to the plan, azithromycin does its job cleanly and quickly.