Azithromycin
PrescriptionWhat is Azithromycin?
Azithromycin is a prescription antibiotic that fights bacterial infections throughout the body. It belongs to a class of medications called macrolide antibiotics. Doctors prescribe it to treat infections of the lungs, sinuses, skin, throat, and ears.
This medication comes in several forms including tablets, oral suspension, and extended-release liquid. The most common form is the Z-Pak, which contains six tablets taken over five days. Azithromycin works differently than many other antibiotics because it stays in your body longer.
Your doctor may prescribe azithromycin because it requires fewer doses than other antibiotics. Many infections can be treated with just a five-day course. This medication only works against bacterial infections, not viruses like the common cold or flu.
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Common uses
- Community-acquired pneumonia
- Acute bacterial sinusitis
- Pharyngitis and tonsillitis caused by strep throat
- Acute bacterial bronchitis
- Skin and soft tissue infections
- Middle ear infections in children
- Certain sexually transmitted infections including chlamydia
- Whooping cough prevention
- Mycobacterium avium complex disease in people with HIV
How it works
Azithromycin stops bacteria from making the proteins they need to survive and multiply. It binds to the bacterial ribosome, which is the part of the cell that builds proteins. Without these essential proteins, the bacteria cannot grow or reproduce.
This antibiotic concentrates in infected tissues at levels much higher than in the bloodstream. It also stays active in your body for several days after you take it. These properties allow azithromycin to keep fighting infection even after you finish the full course of treatment.
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Dosage information
Common dosages range from 250 mg to 500 mg taken once daily. The Z-Pak regimen typically involves 500 mg on day one, followed by 250 mg once daily on days two through five. For some infections, doctors prescribe a single 1,000 mg or 2,000 mg dose. Children receive weight-based dosing calculated by their healthcare provider. Your doctor determines the exact dose and duration based on your specific infection and medical history.
Side effects
- Nausea and stomach pain
- Diarrhea or loose stools
- Vomiting
- Headache
- Dizziness
- Changes in taste
- Fatigue
Serious side effects include severe allergic reactions, irregular heartbeat, liver problems, and severe diarrhea with stomach cramps. Contact your doctor immediately if you experience chest pain, fast or pounding heartbeat, yellowing of skin or eyes, or bloody diarrhea. Azithromycin can rarely cause a heart rhythm problem called QT prolongation, especially in people with existing heart conditions.
Drug interactions
- Antacids containing aluminum or magnesium may reduce absorption
- Warfarin and other blood thinners may have increased effects
- Medications that affect heart rhythm including amiodarone and sotalol
- Digoxin levels may increase
- Nelfinavir and other HIV medications
- Ergotamine and dihydroergotamine for migraines
- Colchicine for gout
Blood test monitoring
Your doctor may order blood tests to check your liver function and white blood cell count while taking azithromycin. Liver enzyme tests including ALT and AST help detect any liver inflammation or damage. A complete blood count monitors your white blood cells, which are part of your immune system response to infection. These tests are especially important if you take azithromycin for longer than the standard five-day course or if you have existing liver conditions.
Related blood tests
Taking Azithromycin? Monitor your levels.
- Track how your body responds
- Catch side effects early with blood work
- Share results with your doctor
Frequently asked questions
No, azithromycin is a prescription-only medication in the United States. You need to see a healthcare provider who will evaluate your symptoms and determine if this antibiotic is appropriate for your condition. Taking antibiotics without proper medical supervision can lead to antibiotic resistance and treatment failure.
A Z-Pak is a prepackaged course of azithromycin containing six 250 mg tablets. You take two tablets on the first day, then one tablet daily for four more days. The total treatment course is five days, but the medication continues working in your body for several days after the last dose.
While azithromycin does not have a direct interaction with alcohol, drinking may worsen side effects like nausea and stomach upset. Alcohol can also slow down your recovery by weakening your immune system. It is best to avoid alcohol until you finish your antibiotic course and feel better.
Take the missed dose as soon as you remember. If it is almost time for your next dose, skip the missed dose and continue your regular schedule. Never take two doses at once to make up for a missed dose.
Stopping antibiotics early allows some bacteria to survive and potentially develop resistance. These resistant bacteria can cause a more serious infection that is harder to treat. Always complete the full prescribed course even if your symptoms improve after a few days.
No, azithromycin only works against bacterial infections, not viruses. COVID-19 and influenza are caused by viruses, so antibiotics will not help. Your doctor may prescribe azithromycin if you develop a secondary bacterial infection alongside a viral illness.
Your doctor may check liver enzymes and white blood cell counts during treatment. Rite Aid offers blood testing services with over 200 biomarkers for $349 per year. Regular monitoring helps ensure the medication is working properly and not causing unwanted effects on your liver or immune system.
Azithromycin is generally considered safe during pregnancy when the benefits outweigh the risks. Small amounts pass into breast milk, but serious effects in nursing infants are unlikely. Always inform your doctor if you are pregnant, planning to become pregnant, or breastfeeding before starting this medication.
Mild diarrhea is a common side effect as the antibiotic affects normal gut bacteria. Stay hydrated and avoid anti-diarrheal medications unless your doctor approves them. Contact your doctor immediately if you develop severe, watery, or bloody diarrhea, as this may indicate a serious intestinal infection called C. difficile.
Azithromycin has a long half-life and stays active in your body for about 68 hours after each dose. After completing a five-day course, the medication continues working for up to a week. This extended activity helps clear the infection even after you stop taking the pills.