Take one tablet by mouth as prescribed, usually once daily for three to five days
Azithromycin 250 mg is an antibiotic tablet you swallow whole with water. Your doctor will tell you exactly how many tablets to take each day and for how many days. Most commonly, you take one 250 mg tablet once per day. Some prescriptions call for a higher first dose (two tablets on day one), then one tablet daily after that. The total course is usually three to five days, though some conditions require longer treatment.
Swallow the tablet with a full glass of water. You can take it with or without food, though taking it with food may help if the tablet upsets your stomach. Do not crush, chew, or split the tablet unless your pharmacist tells you to—swallow it whole.
Take your doses at roughly the same time each day. If you take it at 9 a.m. on Monday, aim for 9 a.m. on Tuesday and Wednesday. This keeps a steady level of the drug in your body.
Key Takeaways
- Swallow one 250 mg tablet whole with water, usually once daily, unless your prescription says otherwise.
- Take your tablet at the same time each day to maintain consistent levels of the antibiotic in your system.
- You can take azithromycin with or without food, but food may reduce stomach upset.
- Do not skip doses or stop early, even if you feel better—finish the full course your doctor prescribed.
- If you miss a dose, take it as soon as you remember, but skip it if your next dose is within 24 hours.
What to do if you miss a dose
If you forget to take a dose, take it as soon as you remember. However, if it is almost time for your next scheduled dose (within 24 hours), skip the missed dose and take your next one on schedule. Never take two tablets at once to make up for a missed dose.
If you are unsure whether enough time has passed, call your pharmacy or doctor. They can tell you whether to take the missed dose based on what time you normally take it and what time you remembered.
Common side effects and what they mean
Mild nausea, diarrhea, stomach pain, or headache are common when taking azithromycin. These often go away as your body adjusts. Taking the tablet with food or a glass of milk can reduce nausea. Drink plenty of water throughout the day, especially if you have diarrhea.
Some people develop a mild rash or feel dizzy. These are usually not serious, but tell your doctor if they do not improve after a day or two, or if they get worse. Do not stop taking the tablet on your own—call your doctor first.
When to contact your doctor right away
Stop taking azithromycin and contact your doctor when ready if you develop severe diarrhea (watery or bloody), chest pain, severe dizziness, difficulty breathing, or signs of an allergic reaction (swelling of the face or throat, severe rash, difficulty swallowing). These are rare but serious and need medical attention.
Also tell your doctor if you have liver disease, heart rhythm problems, or take other medications—azithromycin can interact with certain drugs and may not be safe for you in those situations.
How to store your tablets
Keep azithromycin tablets in their original bottle at room temperature, away from heat, moisture, and direct sunlight. Do not store them in the bathroom medicine cabinet, where humidity can damage them. Keep the bottle tightly closed.
Store the tablets out of reach of children and pets. Do not use tablets after the expiration date printed on the bottle. If you have leftover tablets after finishing your course, ask your pharmacist how to dispose of them safely—do not flush them down the toilet or throw them in the trash unless the label says you can.
Why you should finish the full course
Even if you feel better after two or three days, take all the tablets your doctor prescribed. Stopping early can allow the infection to come back and may lead to antibiotic resistance, which makes the drug less effective for you and others in the future.
Your doctor chose the number of days based on the type and severity of your infection. Finishing the course gives the antibiotic time to fully clear the infection from your body.
What to tell your doctor before taking azithromycin
Before you start taking azithromycin, tell your doctor if you are pregnant, breastfeeding, or planning to become pregnant. Also mention any allergies you have, especially to other antibiotics. Let your doctor know about any heart problems, liver disease, kidney disease, or muscle weakness.
Tell your doctor about all other medications and supplements you take, including over-the-counter drugs. Azithromycin can interact with blood thinners, heart medications, and certain other drugs. Your doctor or pharmacist can check for interactions and adjust your treatment if needed.
Frequently Asked Questions
Can I take azithromycin with other medications?
Azithromycin can interact with blood thinners, heart rhythm medications, and some other drugs. Always tell your doctor and pharmacist about every medication and supplement you take before starting azithromycin. They will check for interactions and let you know if it is safe to take together.
What if I vomit shortly after taking the tablet?
If you vomit within 30 minutes of taking the tablet, take another dose. If you vomit more than 30 minutes after taking it, you do not need to retake it—the tablet has already been absorbed. If vomiting continues, call your doctor or pharmacist for guidance.
Can I take azithromycin if I am pregnant?
Azithromycin is generally considered safe in pregnancy, but only your doctor can decide whether the benefit of treating your infection outweighs any risk. Tell your doctor when ready if you are pregnant or think you might be before taking this medication.
Does azithromycin work right away?
Azithromycin begins working within hours, but you may not feel better for one to two days. Symptoms like fever and sore throat usually improve first. Continue taking all doses even if you feel better early—the full course ensures the infection is completely cleared.
What should I do if I have a severe allergic reaction?
If you develop swelling of the face or throat, severe rash, difficulty breathing, or difficulty swallowing, stop taking the tablet and call emergency services or go to the nearest emergency room when ready. Tell them you took azithromycin. Do not wait to see if symptoms improve on their own.