Azithromycin
Azithromycin Dihydrate · Say it: ay-ZITH-roe-MYE-sin
An antibiotic prescribed for certain mild to moderate infections caused by bacteria. It does not treat viral infections such as the common cold.
Used for
Acute bacterial exacerbations (flare-ups) of chronic bronchitis in adults
Comes as
250 mg tablets (white to off-white, capsule-shaped, film-coated); 500 mg tablets (white to off-white, oval-shaped, film-coated)
Common side effects
Diarrhea or loose stools, Nausea, Stomach (abdominal) pain
| Generic name | Azithromycin Dihydrate |
|---|---|
| Brand names | — |
| Type of medicine | a macrolide antibacterial (antibiotic) medicine |
| How it is sold | Prescription oral tablet |
| Comes as | 250 mg tablets (white to off-white, capsule-shaped, film-coated); 500 mg tablets (white to off-white, oval-shaped, film-coated) |
| Route | oral |
| Boxed warning | No |
| Label date | 2026-03-16 |
💊 What is Azithromycin used for?
- Acute bacterial exacerbations (flare-ups) of chronic bronchitis in adults
- Acute bacterial sinusitis (sinus infection) in adults
- Community-acquired pneumonia in adults and in children 6 months of age and older
- Pharyngitis/tonsillitis (infected throat or tonsils) in adults and in children 2 years of age and older, used as an alternative to first-line therapy in people who cannot use first-line therapy
- Uncomplicated skin and skin structure infections in adults
- Urethritis and cervicitis (infections of the urethra or cervix) in adults
- Genital ulcer disease (chancroid) in men
- Acute otitis media (ear infections) in children 6 months of age and older
How it works
How it is usually taken
- The label says azithromycin tablets can be taken with or without food.
- The label says to take the medicine exactly as your healthcare provider tells you.
- The label says not to skip doses or stop taking it early, even if you start to feel better, until you finish the prescribed treatment. The only exceptions it gives are a serious allergic reaction or a healthcare provider telling you to stop.
- The label says that the length of treatment and the amount taken depend on the infection and on the patient, and that these are set by the prescriber. Follow the instructions from your prescriber or pharmacist.
Comes as
- 250 mg tablets (white to off-white, capsule-shaped, film-coated)
- 500 mg tablets (white to off-white, oval-shaped, film-coated)
⚠️ Azithromycin side effects
Common side effects
- Diarrhea or loose stools
- Nausea
- Stomach (abdominal) pain
- Vomiting
- Other less common effects listed on the label include dizziness, headache, vertigo, sleepiness, tiredness, heartburn-type discomfort (dyspepsia), gas (flatulence), vaginal itching or yeast infection, and rash
Get medical help right away if
- Get medical help right away if you have signs of a serious allergic reaction, such as swelling (angioedema), trouble breathing, or a severe skin reaction. The label says to stop the medicine if this happens. Its listed reactions include anaphylaxis, Stevens-Johnson syndrome, toxic epidermal necrolysis, and DRESS.
- Get medical help right away if you have signs of liver problems, such as yellowing of the skin or eyes (cholestatic jaundice) or signs of hepatitis. The label says the medicine should be stopped immediately if hepatitis signs appear.
- Contact your healthcare provider as soon as possible if you have watery or bloody stools, with or without stomach cramps or fever. The label says this can happen even up to two or more months after the last dose.
- Contact your healthcare provider right away if an infant or young child vomits or becomes irritable when fed. The label links this to a condition called infantile hypertrophic pyloric stenosis, seen after use in newborns.
- Get medical help right away if you have signs of a heart rhythm problem. The label says the medicine can prolong the QT interval and cause torsades de pointes, which can be fatal.
- Contact your healthcare provider right away if you have worsening muscle weakness, since the label says the medicine may make muscle weakness worse in people with myasthenia gravis.
🛑 Who should not take Azithromycin, and who should be careful
The label says not to take it if
- The label says not to take azithromycin if you have had a severe allergic reaction to azithromycin, erythromycin, or any other macrolide or ketolide antibiotic.
- The label says not to take azithromycin if you have a history of cholestatic jaundice or liver dysfunction that happened with past use of azithromycin.
Tell your doctor before taking it if
- Tell your provider if you have pneumonia, cystic fibrosis, or a bacterial infection in the blood (bacteremia).
- Tell your provider if you have liver or kidney problems.
- Tell your provider if you have an irregular heartbeat or QT prolongation.
- Tell your provider if you have myasthenia gravis.
- Tell your provider if you are pregnant or plan to become pregnant, or if you are breastfeeding or plan to breastfeed.
- Tell your provider about all medicines you take, including prescription and non-prescription medicines, vitamins, and herbal supplements.
- The label notes that azithromycin should not be used in patients with pneumonia who are judged inappropriate for oral therapy because of moderate to severe illness or risk factors.
- The label also notes that a study-based association with short-term acute cardiovascular death was seen in adults compared with some other antibacterial drugs. The label says prescribers should weigh this potential risk against the benefits.
🔀 Azithromycin with other medicines, food and alcohol
The label says to discuss these with your doctor or pharmacist
- Nelfinavir: the label says close monitoring for side effects such as liver enzyme changes and hearing problems is warranted. A dose adjustment is not recommended.
- Warfarin (a blood thinner): the label says azithromycin may increase the effect of warfarin, and prothrombin times should be carefully monitored.
- Digoxin, colchicine, and phenytoin: the label says interactions have not been reported in clinical trials, but careful monitoring is advised.
- Aluminum- and magnesium-containing antacids: the label says patients should not take these at the same time as azithromycin.
Alcohol and food
The label says azithromycin can be taken with or without food. The label does not mention alcohol.
🤰 Azithromycin in pregnancy and breastfeeding
Pregnancy
The label says published data and experience over several decades have not identified drug-associated risks for major birth defects, miscarriage, or adverse outcomes with azithromycin use in pregnant women. The label also says it is not known whether azithromycin will harm an unborn baby, so pregnant patients should discuss this with their provider.
Breastfeeding
The label says azithromycin has been reported to pass into breast milk. Talk with your healthcare provider about the best way to feed your baby while you take it. Contact your provider right away if a young child under 6 weeks old vomits or becomes irritable when fed.
🗓️ Storage, missed doses and taking too much
Storage
The label says to store the tablets at 20 to 25 degrees C (68 to 77 degrees F), which is controlled room temperature.
If a dose is missed
The label does not give specific instructions for a missed dose. It says that skipping doses may decrease how well the treatment works and may increase the chance that bacteria become resistant. Ask your prescriber or pharmacist what to do.
If too much is taken
The label says that higher-than-recommended doses caused reactions similar to normal doses, mainly nausea, diarrhea, and vomiting. It says general symptom treatment and supportive measures are used as needed.
🗒️ Questions to ask about Azithromycin
🎯 Check what you understood
1. According to the label, can azithromycin be taken with food?
2. What does the label say about stopping the medicine early because you feel better?
3. Which infection does the label say azithromycin does NOT treat?
❓ Azithromycin: frequently asked questions
Can I take azithromycin with food?
The label says azithromycin tablets can be taken with or without food. The label does not mention alcohol.
Does azithromycin treat colds or the flu?
The label says antibacterial drugs, including azithromycin, should only be used to treat bacterial infections. It says they do not treat viral infections such as the common cold.
Can azithromycin be taken with antacids?
The label says patients should not take aluminum- or magnesium-containing antacids and azithromycin at the same time.
Why do I need to finish the full course?
The label says skipping doses or not completing the full course may decrease how well the treatment works and may increase the chance that bacteria become resistant to azithromycin or other antibacterial drugs.
What side effects are most common?
The label says the most common side effects are diarrhea, nausea, stomach pain, and vomiting. It says most side effects in clinical trials were mild to moderate and went away after the medicine was stopped.
🧪 Tests and reports linked to Azithromycin
The label text mentions these. If you have one of these reports, get every line of it explained.
- Clotting tests (PT, INR)
a test or report linked to this medicine
- Complete blood count (CBC)
a test or report linked to this medicine
- Culture and sensitivity
a test or report linked to this medicine
- Urinalysis
a test or report linked to this medicine
- Hepatitis panel
a test or report linked to this medicine
- Liver function tests
a test or report linked to this medicine
📖 Medical words used on this page
- Acute Otitis Media
Acute otitis media is a sudden infection of the middle ear, behind the eardrum, common in young children.
- Acute vs chronic
Acute means something started recently or suddenly. Chronic means it has lasted a long time or keeps coming back.
- Allergic reaction
An allergic reaction is when the immune system overreacts to something harmless, such as a medicine or food, causing symptoms from a rash to swelling.
- Anaphylaxis
Anaphylaxis is a severe, whole-body allergic reaction that comes on fast and is a medical emergency needing urgent help.
- Angioedema
Angioedema is swelling deep under the skin, often of the lips, face, tongue or throat. Swelling of the throat or tongue needs emergency help.
- Antacid
An antacid is a medicine that neutralises stomach acid to give quick relief from heartburn and indigestion.
- Antibacterial
An antibacterial is a medicine or product that kills bacteria or stops them from growing. Antibacterial medicines do not work on viruses.
- Antibiotic
An antibiotic is a medicine that kills bacteria or stops them growing; it treats bacterial infections, not viral ones like colds or flu.
- Anticoagulant
An anticoagulant is a medicine that slows blood clotting, used to prevent or treat harmful clots. It raises the risk of bleeding.
- Antiplatelet
An antiplatelet is a medicine, such as aspirin or clopidogrel, that stops platelets clumping together to form clots in arteries.
- Arrhythmia
An arrhythmia is a heartbeat that is too fast, too slow or irregular, because the heart's electrical signals are not working in their usual pattern.
- Candida
Candida is a type of yeast (a fungus) that normally lives on the skin and in the mouth, gut and vagina, and can sometimes overgrow and cause infection.
- Candida infection
A candida infection (candidiasis or thrush) is an overgrowth of candida yeast, often in the mouth, vagina, penis or skin folds.
- Cardiovascular mortality
Cardiovascular mortality means deaths caused by heart and blood vessel disease, such as heart attacks, heart failure and strokes.
📖 Medical words on this page
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Explain my leafletDecode my prescription🔗 Trusted sources about Azithromycin
- Full official label on DailyMed ↗
US National Library of Medicine: the complete FDA label this page is based on
- Azithromycin on MedlinePlus ↗
US National Library of Medicine's patient drug information
- Azithromycin on the NHS website ↗
UK National Health Service medicine guide
Report a side effect or check safety alerts
- Report a side effect in the US (FDA MedWatch) ↗
- Report a side effect in the UK (Yellow Card) ↗
- FDA recalls and safety alerts ↗
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Source: official FDA drug label (label updated 2026-03-16). Read the full label on DailyMed
MedicDecode explains the official label in plain words. It is not medical advice and does not replace your doctor or pharmacist. Never start, stop or change a medicine because of what you read here.