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If you need urgent assistance, do not use this service. Call 111, or in an emergency call 999.
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Buy clarithromycin online to treat bacterial sinusitis — macrolide antibiotic prescribed after a quick, free online consultation with a UK prescriber. No GP appointment needed.
Order before 3pm — same-day dispatch (MON - FRI)
~5 min consultation
Secure & confidential · Reviewed by a UK prescriber
No subscription required · Free repeat prescriptions · Cancel anytime
Suitable age
18 years +
Max per order
1 course
Consultation
Yes — free online
Clarithromycin is a macrolide antibiotic used to treat bacterial infections, including acute bacterial sinusitis — a sinus infection caused by bacteria. It works by stopping bacteria from making the proteins they need to grow and multiply, helping your immune system clear the infection so that congestion, facial pain and pressure can settle. Clarithromycin is often used as an alternative for people who are allergic to penicillin-based antibiotics such as amoxicillin. It is usually taken twice a day for a short course, and it is important to complete the full course even if you feel better. Antibiotics do not help viral sinusitis, which is far more common, so a UK prescriber will review your symptoms during a short, free online consultation to confirm whether clarithromycin is appropriate before it is dispensed and delivered discreetly across the UK.
| Active ingredient | Clarithromycin 500 mg tablets |
| Type | Macrolide antibiotic (oral tablets) |
| Used for | Acute bacterial sinusitis; alternative for penicillin allergy |
| Typical dose | 500 mg twice daily (course usually 7 days) |
| Pack size | Full treatment course |
| Prescription | POM — reviewed by a UK prescriber |
| How supplied | After free online consultation |
Take clarithromycin exactly as prescribed. A common adult dose for sinusitis is 500 mg twice a day, usually for around seven days, but your prescriber will confirm the right dose for you. The tablets can be taken with or without food, ideally spaced about 12 hours apart, and should be swallowed whole with a glass of water. Keep taking it at regular intervals and complete the whole course even if you feel better after a couple of days, as stopping early can let the infection return and contributes to antibiotic resistance. If you miss a dose, take it as soon as you remember unless it is nearly time for the next one; never take a double dose to catch up. If your symptoms get worse, do not improve within a few days of finishing the course, or you develop a high fever or severe facial pain, contact your prescriber or GP.
Clarithromycin is an effective option for acute bacterial sinusitis, and it is especially useful if you are allergic to penicillin. It only helps when sinusitis is caused by bacteria — most sinus infections are viral and clear without antibiotics — so a UK prescriber will check your symptoms first during a free online consultation.
Many people start to feel better within 2 to 3 days of starting clarithromycin, though it can take a little longer. It is important to finish the entire course — usually around seven days — even once you feel well, to fully clear the infection and reduce the risk of it returning. If you are no better after completing the course, or get worse at any point, contact your prescriber or GP.
A typical adult dose for acute bacterial sinusitis is 500 mg taken twice a day, usually for seven days. The tablets can be taken with or without food, ideally about 12 hours apart. Your prescriber will confirm the exact dose and course length that is right for you during the online consultation.
Yes. Clarithromycin is a prescription-only medicine, so you cannot buy it over the counter, but you can request it online through Access Doctor. You complete a short, free consultation that is reviewed by a UK prescriber, and if it is suitable it is dispensed by our UK pharmacy and delivered discreetly to your door.
You should not take clarithromycin if you are allergic to it or to other macrolide antibiotics such as erythromycin or azithromycin. Tell your prescriber if you have heart rhythm problems, liver or kidney problems, or take medicines such as statins or warfarin, as clarithromycin can interact with them. If you are pregnant or breastfeeding, let your prescriber know so they can confirm whether it is appropriate for you.
Drinking alcohol in moderation does not stop clarithromycin from working, so an occasional drink is usually fine. However, both alcohol and the antibiotic can upset your stomach, and while your body is fighting a sinus infection it is best to rest, stay well hydrated and limit alcohol. If you feel unwell or nauseous, it is sensible to avoid alcohol until you have recovered.
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