Azithromycin vs. Zithromax

See how Azithromycin and Zithromax compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Azithromycin is the generic name for the same active ingredient sold under the brand name Zithromax, so their effects on the body are identical.

  • The real-world choice between them usually comes down to cost and insurance coverage, since generic azithromycin is typically much cheaper than brand-name Zithromax.

  • Zithromax's FDA label separately spells out prevention and treatment of disseminated MAC disease, an indication generic labeling does not call out on its own.

Azithromycin vs. Zithromax Drug Summary

Azithromycin

Azithromycin is a macrolide (azalide) antibiotic used to treat bacterial infections such as pneumonia, sinusitis, and skin infections. It comes as an oral tablet, liquid suspension, or IV infusion, and its long tissue half-life allows short 3-to-5-day or single-dose regimens. It is sold as a low-cost generic by many manufacturers.

Zithromax

Zithromax is the original brand-name version of azithromycin, a macrolide antibiotic used for the same bacterial infections, including pneumonia, sinusitis, and skin infections. It comes as an oral tablet, liquid suspension, or IV powder for injection, using the same short-course dosing that azithromycin's long tissue half-life allows. Its label also covers prevention of MAC disease in certain patients.

Azithromycin vs. Zithromax Side Effects

Azithromycin

Most common
nausea (up to 18%)
abdominal pain (up to 7%)
vomiting (up to 7%)
diarrhea/loose stools (up to 14%)

Zithromax

Most common
nausea (3% to 18%)
abdominal pain (3% to 7%)
vomiting (2% to 7%)
diarrhea (5% to 14%)

Azithromycin vs. Zithromax Dosage

Azithromycin

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 500 mg once Day 1
Maximum dose 5 mg/kg once daily Days 2-5
Dose changes 6 increases As tolerated

Zithromax

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 500 mg once daily Day 1
Maximum dose 30 mg/kg single dose If needed
Dose changes 5 increases As tolerated

Azithromycin vs. Zithromax Indications

Azithromycin

Azithromycin treats a wide range of bacterial infections affecting the lungs, sinuses, throat, skin, and reproductive tract. It is not effective against viral infections like colds or flu. Off-label, it is sometimes used for traveler's diarrhea.

  • Community-acquired pneumonia

  • Acute bacterial sinusitis and bronchitis exacerbations

  • Pharyngitis, tonsillitis, and skin infections

  • Urethritis, cervicitis, and chancroid

  • Pelvic inflammatory disease and acute otitis media

Zithromax

Zithromax treats the same bacterial infections as generic azithromycin, including lung, sinus, throat, skin, and reproductive tract infections. Its label additionally covers prevention and treatment of disseminated MAC disease in people with weakened immune systems. Like azithromycin, it is not effective against viral infections.

  • Community-acquired pneumonia

  • Acute bacterial sinusitis and bronchitis exacerbations

  • Pharyngitis, tonsillitis, and skin infections

  • Urethritis and cervicitis from chlamydia or gonorrhea

  • Prevention and treatment of MAC disease

Azithromycin vs. Zithromax Pros and Cons

Azithromycin

Generic azithromycin has the identical clinical profile to Zithromax because it is the same active ingredient, but it is typically far less expensive and more widely stocked. Most insurance plans and discount generic programs favor it over the brand-name product.

Pros

  • Available as a low-cost generic, roughly $15 to $50 per course without insurance, versus $45 to $150 for brand-name Zithromax

  • Stocked at nearly every pharmacy, often included in low-cost pharmacy discount generic programs

  • Covered as a preferred generic by most insurance formularies

Cons

  • Labeling does not separately spell out the MAC disease prevention indication that Zithromax carries

  • Inactive ingredients, flavoring, or suspension texture can vary slightly between generic makers

  • Pill or liquid appearance can change between refills if the pharmacy switches manufacturers

Zithromax

Zithromax is the original brand-name formulation of azithromycin, chemically identical to the generic version. Its FDA label separately lists prevention and treatment of MAC disease, and some clinicians and patients prefer the brand for formulation consistency.

Pros

  • FDA label explicitly includes prevention and treatment of disseminated MAC disease

  • Single consistent manufacturer means no variation in inactive ingredients between refills

  • Pill shape, color, and liquid flavor stay the same from refill to refill

Cons

  • Costs more than generic azithromycin, roughly $45 to $150 per course without insurance, versus $15 to $50 for the generic

  • Less commonly included in retail pharmacy discount generic programs

  • Supply depends on a single manufacturer, so shortages can affect availability more directly

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