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
What should I do if I miss a dose?
Take the missed dose as soon as you remember. If it’s almost time for your next dose, skip the missed one — do not double up.
Can I drink alcohol while taking azithromycin?
Moderate alcohol is generally safe, but avoid excessive drinking, as it may increase stomach upset or affect your recovery.
Do I need to complete the full course of azithromycin?
Yes. Stopping early may not fully clear the infection and can lead to antibiotic resistance.
Can azithromycin cause diarrhea?
Yes, diarrhea is common. Contact your doctor if it is severe, bloody, or persistent, as this may indicate a serious infection.
Can azithromycin be used for viral infections?
No, azithromycin only works against bacterial infections, not viruses like the common cold or flu.
Medical Disclaimer: This information is provided for educational purposes only and is not intended to replace professional medical advice, diagnosis, or treatment. Always consult a healthcare professional before starting, stopping, or changing any medication.
Last reviewed: June 2026
