About

Azithromycin is an antibiotic used to treat bacterial infections. It belongs to a class of drugs called macrolide antibiotics. It works by stopping bacteria from growing and multiplying, helping your body fight the infection.

Azithromycin is commonly prescribed for:

• Respiratory tract infections (e.g., bronchitis, pneumonia)
• Ear infections (otitis media)
• Skin and soft tissue infections
• Sexually transmitted infections such as chlamydia
• Throat infections (e.g., tonsillitis, pharyngitis)

Azithromycin is available in:

• Tablets (250 mg, 500 mg)
• Oral suspension (100 mg/5 mL, 200 mg/5 mL)
• Injectable form (used in hospital settings)

How and When to Use It

Take azithromycin exactly as prescribed by your doctor.

Dosage: Usually taken once daily for a few days depending on the infection. Follow your doctor’s instructions carefully.

Swallow tablets whole with water. Shake oral suspension well before measuring the dose.

Complete the full course, even if you feel better, to ensure the infection is fully treated.

Contraindications

Do not take azithromycin if you have:

• Allergy to azithromycin, erythromycin, or other macrolide antibiotics
• Severe liver disease or history of liver problems caused by antibiotics
• Heart rhythm problems (QT prolongation)

Side Effects

Like all medicines, azithromycin can cause side effects, although not everyone gets them.

Common side effects:

• Diarrhea or loose stools
• Nausea or vomiting
• Stomach pain or cramps
• Headache

Serious side effects — seek medical attention immediately:

• Severe allergic reaction (rash, swelling, difficulty breathing)
• Severe diarrhea with blood or mucus (possible Clostridium difficile infection)
• Irregular heartbeat or fainting
• Yellowing of skin or eyes (liver problems)

Pregnancy, Breastfeeding & Fertility

Azithromycin can be used during pregnancy if clearly needed and prescribed by a doctor.

It is generally considered safe during breastfeeding, but discuss with your doctor to weigh benefits and risks.

There is no evidence that azithromycin affects fertility in men or women.

Interactions With Other Medications

Some medicines can increase the risk of side effects or reduce the effectiveness of azithromycin. Tell your doctor if you take:

• Other antibiotics, especially macrolides
• Heart rhythm medicines (e.g., amiodarone, sotalol)
• Blood thinners such as warfarin
• Antacids containing aluminum or magnesium (take separately from azithromycin)

Frequently Asked Questions