Azithromycin vs Famotidine: side-by-side comparison
Azithromycin (Macrolide antibiotic) and Famotidine (H2-receptor antagonist) belong to different therapeutic classes and are rarely substitutes for each other. The comparison is useful when a single patient is weighing both options for adjacent or overlapping needs.
| Property | Azithromycin | Famotidine |
|---|---|---|
| Therapeutic class | Macrolide antibiotic | H2-receptor antagonist |
| CAS | 83905-01-5 | 76824-35-6 |
| ATC | J01FA10 | A02BA03 |
| Molecular weight | 748.98 g/mol | 337.45 g/mol |
| Brands with this active ingredient | 1 | 1 |
What they share
Azithromycin and Famotidine share the common regulatory framework for prescription active ingredients, bioequivalence standards for generics, and pharmacist oversight. Beyond that, points in common are limited.
Key differences
Azithromycin acts by a different mechanism than Famotidine, with indications that barely overlap. Comparing the two is useful when a clinician has mentioned both in the same context or the patient wants to understand why one was prescribed instead of the other.
Mechanisms compared
Azithromycin: Azithromycin reversibly binds the 50S ribosomal subunit of susceptible bacteria, inhibiting protein synthesis. Famotidine: Famotidine reversibly and competitively blocks histamine H2 receptors on gastric parietal cells, reducing both basal and stimulated gastric acid secretion.
Indications compared
Azithromycin: Azithromycin is approved in adults and children for the treatment of respiratory tract infections, otitis media, skin and soft tissue infections, and sexually transmitted infections caused by susceptible organisms, inclu… Famotidine: Famotidine is approved in adults and children for short-term treatment of active duodenal and gastric ulcer, maintenance therapy of duodenal ulcer, gastro-oesophageal reflux disease, Zollinger-Ellison syndrome and other…
Safety profile
Azithromycin: Common adverse effects are gastrointestinal: nausea, diarrhoea and abdominal discomfort. Famotidine: Famotidine is generally well tolerated.
Frequently asked questions
Is Azithromycin better than Famotidine? ▾
Azithromycin and Famotidine are not "better or worse" — they treat different things. The sensible question is which fits your specific need.
Can Azithromycin and Famotidine be combined? ▾
Whether they can be combined depends on the indications and the interaction profile of each. If both are in a single prescription, the prescriber has weighed it; in self-medication they should never be combined.
Do they have the same side-effect profile? ▾
No — they belong to different classes and have distinct side-effect profiles. Each has its own prescribing information.
Products with Azithromycin
Products with Famotidine
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.