Zithromax Z-Pak 250 mg Tablet Strength
Yes, 250 mg is the correct and standard tablet strength for the Zithromax Z-Pak. The Z-Pak contains six 250 mg tablets designed for a 5-day treatment course 1.
Standard Z-Pak Dosing Regimen
The typical Z-Pak regimen consists of:
- Day 1: Two 250 mg tablets (500 mg total)
- Days 2-5: One 250 mg tablet daily (250 mg per day)
- Total course: 1.5 grams over 5 days
This is the FDA-approved formulation marketed as the Z-PAKS®, which comes in boxes containing 6 tablets of 250 mg each 1.
Available Formulations
Zithromax (azithromycin) tablets are manufactured in two strengths:
250 mg tablets: Pink, modified capsular shaped, film-coated tablets engraved with "PFIZER" and "306" (or "Pfizer" and "ZTM 250"). Available in Z-PAKS® of 6 tablets 1
500 mg tablets: Pink, modified capsular shaped, film-coated tablets engraved with "Pfizer" and "ZTM500". Available in TRI-PAKS™ of 3 tablets 1
Clinical Context
The 250 mg strength is specifically designed for the standard 5-day regimen, which has been extensively studied and validated for various bacterial infections including respiratory tract infections 2, 3. Research demonstrates that this dosing schedule (500 mg day 1, then 250 mg days 2-5) maintains tissue concentrations above the minimum inhibitory concentration (MIC) for key respiratory pathogens for up to 10 days after completion of therapy 3.
Important caveat: For certain indications like pertussis prophylaxis or treatment, the dosing differs—adults receive 500 mg on day 1, followed by 250 mg daily on days 2-5 2. For single-dose therapy (such as chlamydial infections), a 1-gram dose using four 250 mg tablets or two 500 mg tablets is appropriate 2.
The 250 mg tablet strength is correct and represents the standard formulation for the Z-Pak regimen.