How does clarithromycin work?
Clarithromycin blocks bacterial protein production, preventing bacteria from spreading and helping your immune system clear the infection.
What is clarithromycin used to treat?
Clarithromycin is commonly prescribed for:
- Chest infections (such as pneumonia and bronchitis)
- Sinus infections
- Skin infections (such as cellulitis)
- Throat infections (such as tonsillitis)
- Stomach ulcers caused by Helicobacter pylori (in combination with other medicines)
Who can take clarithromycin?
Clarithromycin is suitable for most adults and children who have a bacterial infection that needs antibiotic treatment.
Who might not be able to take clarithromycin?
Clarithromycin may not be suitable if you:
- Are allergic to clarithromycin or similar antibiotics (such as erythromycin)
- Have liver or kidney disease
- Have heart problems or an irregular heartbeat
- Are taking certain medicines, such as statins or blood thinners (as clarithromycin may interact with them)
Can I take clarithromycin if I’m pregnant or breastfeeding?
Clarithromycin isn’t usually recommended during pregnancy or while breastfeeding. Speak to your doctor for alternative antibiotics if needed.
What if I miss a dose?
If you forget a dose, take it as soon as you remember. If it’s close to your next dose, skip the missed one—do not take two doses at once.
How effective is clarithromycin?
Clarithromycin is highly effective at treating bacterial infections when taken correctly. Most people feel better within a few days, but it’s important to complete the full course to prevent antibiotic resistance.
What should I do if I take too much?
Taking too much clarithromycin may cause nausea, vomiting, or stomach pain. If you think you’ve taken too much, seek medical help immediately.
What dose of clarithromycin is usually taken?
- For most infections: 250mg to 500mg twice daily for 7 to 14 days
- For Helicobacter pylori (stomach ulcers): Taken with other medications for 7 to 14 days
Your doctor will determine the right dose for your condition.
Powered by pharmacies
With over 1,700 pharmacy partners across the UK, you can get the help you need, wherever you are based.
Our website and mobile app make it easy and convenient to manage your health needs and book services at a pharmacy nearby.
What are the side effects of clarithromycin?
Common side effects include:
Serious side effects, such as liver problems or allergic reactions, require urgent medical attention.
How should I take clarithromycin?
Clarithromycin is taken as a tablet, capsule, or liquid, usually twice daily. Swallow the tablet whole with water, with or without food.
When should clarithromycin be taken?
Clarithromycin is usually taken every 12 hours, at the same times each day.
What are the brand names for clarithromycin?
Clarithromycin is available as a generic medicine, but some branded versions include:
- Klacid
Final thoughts
Clarithromycin is an effective antibiotic for bacterial infections, but it’s important to finish the full course to prevent resistance. If you have concerns, speak to your doctor or pharmacist.
