Azithromycin Tablets – A Powerful Ally Against Bacterial Infections
Azithromycin Tablets: Uses, Side Effects and How to Get Them in the UK
Medical disclaimer: This article is for informational purposes only. Azithromycin is a prescription-only medicine. Always complete a clinical consultation before use. Our prescribers are GPhC-registered pharmacist independent prescribers.
Azithromycin is a macrolide antibiotic widely used in the UK to treat a variety of bacterial infections. Its convenient once-daily dosing, excellent tissue penetration, and short treatment courses — often just three to five days — make it one of the most prescribed antibiotics for both respiratory and sexual health conditions. It is also a first-line treatment for chlamydia, the most commonly diagnosed sexually transmitted infection in the UK.
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Azithromycin belongs to the macrolide class of antibiotics. It works by binding to the 50S ribosomal subunit of bacteria and inhibiting protein synthesis — without which bacteria cannot grow, replicate, or spread. The drug achieves unusually high concentrations in tissues and cells, making it particularly effective against pathogens that reside inside cells, such as Chlamydia trachomatis.
Unlike some antibiotics that require multiple doses throughout the day, azithromycin’s long tissue half-life means once-daily dosing is sufficient — and for chlamydia treatment, a single 1g dose is often all that is needed.
What Does Azithromycin Treat?
| Condition | Typical Regimen | NICE Status |
|---|---|---|
| Chlamydia | 1g single dose | NICE-recommended first-line |
| Community-acquired pneumonia (mild) | 500mg daily for 3–5 days | NICE-recommended |
| Acute bronchitis / chest infection | 500mg daily for 3 days | Second-line where indicated |
| Skin & soft tissue infections | 500mg daily for 3–5 days | Suitable where penicillin is contraindicated |
| Ear infections (otitis media) | 10mg/kg daily in children; adult doses vary | Second-line |
| Sinusitis | 500mg daily for 3 days | Where first-line antibiotics are unsuitable |
Note on gonorrhoea: Azithromycin is no longer recommended as monotherapy for gonorrhoea due to increasing resistance. Current BASHH guidelines recommend ceftriaxone 1g intramuscular injection. Always confirm the infection type before treatment.
Azithromycin for Chlamydia
Chlamydia trachomatis is the UK’s most commonly diagnosed STI. It often causes no symptoms, meaning many people are unaware they are infected — making testing and prompt treatment essential. Azithromycin 1g as a single oral dose is a NICE-recommended treatment for uncomplicated urogenital chlamydia.
Important post-treatment guidance:
- Avoid sexual contact (including oral sex) for 7 days after treatment to allow the infection to fully clear
- Sexual partners should also be tested and treated simultaneously
- A test-of-cure is recommended at 3–6 weeks if you were pregnant, had rectal or pharyngeal infection, or symptoms persist
- Retesting for chlamydia 3 months after treatment is advised, as reinfection is common
Key Advantages of Azithromycin
- Once-daily dosing — significantly better adherence than antibiotics requiring 2–4 daily doses
- Shorter treatment course — most infections require only 1–5 days, reducing the total antibiotic burden
- Excellent tissue penetration — reaches intracellular pathogens effectively
- Suitable for penicillin-allergic patients — offers an alternative pathway for those who cannot take amoxicillin
- Generally well-tolerated — mild, short-lived side effects in most people
Side Effects of Azithromycin
Side effects are usually mild and transient given the short treatment duration:
- Nausea, abdominal pain, and diarrhoea (most common)
- Altered or metallic taste
- Headache
- Mild skin rash
Cardiac caution: Azithromycin can rarely prolong the QT interval (affecting heart electrical activity). Inform your prescriber if you have a history of heart arrhythmias, take other QT-prolonging medicines, or have low potassium or magnesium levels. Report any palpitations or chest discomfort during treatment.
Who Should Not Take Azithromycin?
- Those with a known allergy to azithromycin or other macrolide antibiotics (erythromycin, clarithromycin)
- People with severe liver disease (dose adjustment may be needed)
- Those with a history of cardiac arrhythmias or prolonged QT interval without specialist advice
- People with myasthenia gravis — azithromycin can worsen neuromuscular weakness
Pregnant or breastfeeding women should discuss with a prescriber before use. Azithromycin is used in pregnancy where clinically necessary, particularly for chlamydia, but alternatives exist.
Important Prescribing Safety Information
- Always complete the full course — do not stop early even if symptoms resolve
- Take once daily, with or without food (food may reduce nausea)
- If you miss a dose, take it as soon as remembered — never double up
- Store at room temperature, away from moisture and direct sunlight
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Start Consultation →Frequently Asked Questions About Azithromycin
What is azithromycin used for?
Azithromycin is used to treat bacterial infections including chlamydia, chest infections, skin infections, ear infections, and sinusitis. It is a macrolide antibiotic that stops bacterial growth by inhibiting protein synthesis.
Does azithromycin treat chlamydia?
Yes. Azithromycin 1g as a single oral dose is a NICE-recommended first-line treatment for uncomplicated chlamydia. It achieves high tissue concentrations in genitourinary tissue where C. trachomatis resides.
Can I drink alcohol while taking azithromycin?
There is no dangerous interaction between azithromycin and alcohol (unlike metronidazole). However, drinking alcohol while unwell or on antibiotics is generally not advisable, as it can worsen nausea and slow recovery.
What are the side effects of azithromycin?
Common side effects include nausea, diarrhoea, abdominal pain, and a metallic taste. Azithromycin can rarely prolong the QT interval — inform your prescriber if you have a history of heart arrhythmias.
How quickly does azithromycin work?
Symptoms typically begin to improve within 2–3 days. For chlamydia, the single 1g dose clears the infection within about 7 days. Avoid sexual contact for 7 days post-treatment and ensure any partners are also treated.
References
- NICE. Chlamydia — uncomplicated genital infection. Clinical Knowledge Summary, 2023. cks.nice.org.uk
- BASHH. United Kingdom National Guideline for the Management of Infection with Chlamydia trachomatis. 2018. bashh.org
- NHS. Azithromycin. nhs.uk/medicines/azithromycin
- GPhC. Standards for registered pharmacies. pharmacyregulation.org
