Azithromycin — quick, practical guide

Azithromycin is a common antibiotic used for a range of bacterial infections. People often know it as a "Z‑pack." It works well for some respiratory infections, ear infections, certain skin infections, and sexually transmitted infections like chlamydia. But it’s not for viruses like colds or the flu, so don’t use it unless a clinician confirms a bacterial cause.

How to take azithromycin

There are a few common dosing patterns. The classic Z‑pack is 500 mg on day 1 then 250 mg once daily for days 2–5. For uncomplicated chlamydia, a single 1 g (1000 mg) dose is often used. Your doctor may choose different lengths for pneumonia or skin infections. Always follow the prescription — don’t skip doses and don’t stop early just because you feel better. Stopping early can let bacteria survive and become resistant.

Take azithromycin with or without food. If it upsets your stomach, try taking it with a light snack. If you miss a dose, take it as soon as you remember unless it’s almost time for the next dose — then skip the missed dose and continue. Don’t double up.

Side effects, interactions, and precautions

Most people tolerate azithromycin well. The common side effects are nausea, diarrhea, stomach pain, and headache. Rare but serious problems include liver injury, severe allergic reactions, and irregular heart rhythms (QT prolongation). If you have a history of heart rhythm problems, low potassium or magnesium, or are on medicines that affect the QT interval, tell your prescriber.

Azithromycin interacts less with liver enzymes than some other macrolides, but it can still affect drugs like warfarin. Mention all medicines, including supplements and over‑the‑counter drugs, when you talk with your provider. If you notice ringing in the ears or sudden hearing changes, stop the drug and seek medical advice.

Pregnancy and breastfeeding: azithromycin is commonly used in pregnancy when needed, but check with your clinician. For breastfeeding, discuss risks and benefits with your provider.

Antibiotic resistance is real. Using azithromycin when it’s not needed makes it less effective for everyone. Ask your clinician if the infection might be viral and whether testing is appropriate.

Want to buy azithromycin online? Choose licensed pharmacies that require a valid prescription, show clear contact information, and offer pharmacist support. Beware of sites that sell antibiotics without a prescription, list unrealistically low prices, or hide their location. Secure checkout (HTTPS), visible licensing, and an easy way to contact a pharmacist are good signs.

If you’re unsure whether azithromycin is right for you, ask a clinician. A short chat or a test can save you side effects and help avoid resistance. Use antibiotics wisely and follow the simple safety steps above to get the best outcome.