Augmentin vs. Azithromycin

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

Key Takeaways

  • Augmentin combines amoxicillin with a beta-lactamase inhibitor to fight resistant bacteria, while azithromycin is a macrolide often used for short, convenient courses.

  • Azithromycin's 3- to 5-day or single-dose regimens are easy to complete, but the drug carries an FDA warning for QT prolongation and irregular heart rhythms.

  • Augmentin generally covers resistant bacteria more reliably but needs multiple daily doses and cannot be used by people with penicillin allergies.

Augmentin vs. Azithromycin Drug Summary

Augmentin

Augmentin is a penicillin-class antibiotic that combines amoxicillin with clavulanate, a beta-lactamase inhibitor that helps it work against bacteria resistant to amoxicillin alone. It treats infections like sinusitis, ear infections, pneumonia, skin infections, and urinary tract infections. It comes as a tablet, chewable tablet, or oral suspension, taken two to three times a day depending on the dose.

Azithromycin

Azithromycin is a macrolide antibiotic used for many of the same respiratory, skin, and sexually transmitted infections as Augmentin, plus pneumonia and pelvic inflammatory disease. It is best known for short treatment courses, often a 5-day pack or even a single dose, because it stays active in tissue for days. It comes as a tablet, oral suspension, or IV infusion.

Augmentin vs. Azithromycin Side Effects

Augmentin

Most common
diarrhea/loose stools (up to 9%)
nausea (up to 3%)
vomiting (up to 1%)
skin rash/urticaria (up to 3%)

Azithromycin

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

Augmentin vs. Azithromycin Dosage

Augmentin

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 250 mg/125 mg every 8 hrs At the start
Maximum dose 2000 mg/125 mg every 12 hrs If needed
Dose changes 4 increases As tolerated

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

Augmentin vs. Azithromycin Indications

Augmentin

Augmentin is FDA-approved for common bacterial infections including ear, sinus, lung, skin, and urinary tract infections. Adding clavulanate lets it treat bacteria that would otherwise resist plain amoxicillin. It is not effective against viral infections and should not be used by people with a history of penicillin allergy.

  • Acute bacterial otitis media (ear infections)

  • Acute bacterial sinusitis

  • Community-acquired pneumonia (Augmentin XR)

  • Skin and skin structure infections

  • Urinary tract infections

Azithromycin

Azithromycin is FDA-approved for many bacterial infections of the lungs, sinuses, throat, skin, and reproductive tract, including chlamydia and pelvic inflammatory disease. Its long tissue half-life allows short treatment courses compared with other antibiotics. It does not treat viral illnesses like the common cold or flu.

  • Community-acquired pneumonia

  • Pharyngitis and tonsillitis

  • Urethritis and cervicitis (chlamydia)

  • Pelvic inflammatory disease

  • Acute otitis media

Augmentin vs. Azithromycin Pros and Cons

Augmentin

Augmentin's added clavulanate broadens its coverage to bacteria that produce beta-lactamases, making it a reliable first-line choice for many common infections. It has been used since 1984 with a well-established safety record and no FDA boxed warning. It does require more frequent daily dosing and cannot be used by people with penicillin allergies.

Pros

  • Covers beta-lactamase-producing resistant bacteria

  • No FDA boxed warning, long safety track record since 1984

  • Available as chewable tablets and pediatric suspension

  • No QT-prolongation warning on the label

Cons

  • Requires dosing two to three times daily

  • Cannot be used in people with penicillin allergy

  • Higher rate of diarrhea than typical short-course antibiotics

  • Roughly $80 to $150 per course without insurance, generally pricier than generic azithromycin

Azithromycin

Azithromycin's long tissue half-life allows short 3- to 5-day or even single-dose regimens, which many patients find easier to complete. It can be used by people with penicillin allergies since it belongs to a different antibiotic class. It carries an FDA warning for QT prolongation and should be used cautiously in people with heart rhythm problems.

Pros

  • Short 3- to 5-day or single-dose regimens

  • Safe option for people with penicillin allergy

  • Generic 5-day course typically $15 to $50, less than Augmentin

  • Long tissue half-life keeps working after the course ends

Cons

  • FDA warning for QT prolongation and cardiovascular death risk

  • Higher rates of nausea and diarrhea than Augmentin

  • Less reliable against beta-lactamase-producing bacteria

  • Reports of infantile pyloric stenosis with use in newborns

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