Azithromycin vs Clarithromycin: Side-by-Side Comparison
Quick answer: Azithromycin and Clarithromycin are both macrolide antibiotic used for similar indications. They share a mechanism of action but differ in dosing, half-life, side-effect profile, and clinical preferences. Switching between them is a clinical decision.
Side-by-side comparison
| Feature | Azithromycin | Clarithromycin |
|---|---|---|
| Drug class | Macrolide antibiotic | Macrolide antibiotic |
| ATC code | J01FA10 | J01FA09 |
| Primary indications | Respiratory tract infections, Skin infections | Respiratory tract infections, H. pylori eradication |
| Mechanism | Binds to the 50S ribosomal subunit inhibiting bacterial protein synthesis | Binds 50S ribosomal subunit to inhibit bacterial protein synthesis |
| Common dose | 500 mg once daily for 3 days or 500 mg day 1 then 250 mg days 2-5 | 250-500 mg twice daily |
| Detail page | Azithromycin details → | Clarithromycin details → |
How to choose between Azithromycin and Clarithromycin
Both medicines belong to the same therapeutic class and address overlapping indications. Selection between them depends on:
- Patient-specific factors: age, kidney and liver function, other medications, allergies, comorbidities
- Specific clinical indication: some class members are preferred for particular conditions or guideline recommendations
- Dosing preference: once-daily vs twice-daily, oral vs injectable, food requirements
- Tolerability: individual side-effect profiles vary even within a class
- Drug interactions: patient's other medications may interact differently with each option
- Cost and availability: generic availability, insurance coverage, regional access
Should you switch?
Switching between class members is a clinical decision, not a self-help one. Reasons your prescriber may consider switching include:
- Inadequate response to current medication
- Side effects affecting quality of life
- New drug interactions due to a recently added medication
- Cost or availability changes
- Updated guidelines favoring a different option
Never switch medications, change dose, or stop without consulting your prescriber.
Related
All Macrolide antibiotic on iMedic · Azithromycin full details · Clarithromycin full details
Frequently asked questions
Is Azithromycin better than Clarithromycin?
Neither is universally 'better.' They are both macrolide antibiotic with similar mechanisms of action. The right choice depends on the specific clinical situation, patient factors, dosing preferences, drug interactions, and tolerability. Discuss with your prescriber.
Can I switch from Azithromycin to Clarithromycin?
Switching is possible but should be done under clinical supervision. Different class members may not be interchangeable on a 1:1 dose basis, and tapering or transition strategies vary. Never switch on your own.
Do Azithromycin and Clarithromycin have the same side effects?
They share class-wide side-effect tendencies but differ in individual profiles. Some patients tolerate one better than the other. Specific frequency and severity of side effects can be found on each medicine's individual page.
Are Azithromycin and Clarithromycin available as generics?
Generic availability depends on patent status in your country. Most well-established class members are available generically and are clinically equivalent to brand-name versions.
Last reviewed: by iMedic Medical Editorial Team. Our editorial process.