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This is an information resource — not medical advice.

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Macrolide Antibiotic🔒 Prescription only

What Is Azithromycin (Z-Pack) Used For?

Brand names: Zithromax, Z-Pack

Azithromycin, commonly known as Z-Pack, is a macrolide antibiotic used to treat respiratory infections, skin infections, and some STIs.

What is Azithromycin used for?

Community-acquired pneumonia
Bronchitis (bacterial)
Strep throat (in penicillin-allergic patients)
Skin and soft tissue infections
Chlamydia and gonorrhea
Ear infections
Sinusitis

How does Azithromycin work?

Azithromycin binds to bacterial ribosomes, blocking protein synthesis. Without protein production bacteria cannot grow. It remains in tissues for days after the last dose.

Dosage information

💊Available forms

250mg tablets
500mg tablets
200mg/5ml suspension
1g powder packet

📏Typical dosage

Z-Pack: 500mg on day 1, then 250mg days 2–5. Single 1g dose for chlamydia. Dosing varies by infection type.

⚠️ Dosage varies by individual. Always follow your doctor's or pharmacist's instructions — never self-dose based on general information.

Side effects

Common

Nausea
Diarrhea
Stomach pain
Vomiting
Headache

⚠️ Serious — contact your doctor

QT prolongation (heart rhythm changes — important with heart conditions)
Severe allergic reactions
C. difficile colitis
Liver problems (rare)

Important warnings

Tell your doctor if you have heart rhythm problems — QT prolongation risk

Complete the full prescribed course

Does not treat viral infections

If penicillin-allergic, tell your doctor — azithromycin is often an alternative

Drug interactions

These substances may interact with Azithromycin. This is not a complete list — always tell your doctor and pharmacist ALL medications and supplements you take.

Antacids containing aluminum or magnesium (take separately)WarfarinQT-prolonging drugsErgotamine

Pregnancy & breastfeeding

🤰 Generally considered safe — discuss with your doctor

Always consult your doctor or obstetrician before taking any medication during pregnancy or while breastfeeding.

Frequently asked questions

What is azithromycin (Z-Pack) used for?

Azithromycin treats bacterial infections including pneumonia, bronchitis, skin infections, ear infections, sinusitis, and STIs like chlamydia. It does not treat viral infections.

Why is azithromycin called a Z-Pack?

Z-Pack refers to the standard 5-day pack: 500mg on day 1, then 250mg per day for days 2–5. The 'Z' comes from Zithromax.

Can I drink alcohol while taking azithromycin?

Alcohol doesn't directly interact but can worsen nausea and impair your immune system. Moderate amounts are generally acceptable.

How long does azithromycin stay in your system?

Azithromycin has a very long half-life — stays in tissues for up to 15 days after the last dose. This is why a 5-day course works despite the short duration.

Is azithromycin safe for penicillin-allergic patients?

Yes — azithromycin is unrelated to penicillin and commonly prescribed as an alternative for respiratory infections in penicillin-allergic patients.

Related medications

💊AmoxicillinPenicillin-type Antibiotic 💊IbuprofenNSAID 💊OmeprazoleProton Pump Inhibitor (PPI)💊CetirizineSecond-Generation Antihistamine

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This is an information resource — not medical advice.

🚨 If you are experiencing a medical emergency or think you may have taken too much of a medication, call emergency services (911 in the US) or go to your nearest emergency room immediately.

Information on this page is sourced from general pharmaceutical references and is provided for educational purposes only. Drug information may change — always verify with your pharmacist or prescriber. PillCodex.com is not affiliated with any pharmaceutical company.