Azithromycin for STI Treatment
Buy Azithromycin for STI Treatment Online in the UK
What is azithromycin and how does it work?
Azithromycin is a macrolide antibiotic used to treat a range of bacterial infections, including certain sexually transmitted infections (STIs) such as chlamydia. In the UK, it is one of the most commonly prescribed antibiotics for STI treatment and is available through regulated online pharmacies following a clinical consultation.
The antibiotic works by blocking bacterial protein synthesis. Specifically, it binds to the 50S subunit of the bacterial ribosome, preventing bacteria like Chlamydia trachomatis from producing the proteins they need to grow and multiply. This does not kill the bacteria outright — instead, it stops them from spreading, allowing your immune system to clear the infection.
A key advantage of azithromycin is its long half-life. Unlike many antibiotics that require dosing several times a day for multiple days, azithromycin accumulates in tissue and continues working for days after the final dose. This makes it especially practical for treating STIs where adherence to a longer course might be challenging.
Already been diagnosed with chlamydia or another STI? Start a confidential online consultation and receive prescription treatment delivered discreetly to your door.
Start your consultation GPhC Reg. Pharmacy #9011198 · Prescriptions issued by qualified pharmacist independent prescribers · Discreet packagingWhich STIs does azithromycin treat?
Access Doctor prescribes azithromycin for the treatment of sexually transmitted infections caused by specific bacterial organisms. The two main indications are chlamydia (Chlamydia trachomatis) and, in certain circumstances, gonorrhoea (Neisseria gonorrhoeae).
Chlamydia
Chlamydia is the most commonly diagnosed STI in England. According to the UK Health Security Agency (UKHSA), chlamydia accounted for almost half of all new STI diagnoses in England in 2024, with over 168,000 cases recorded. The infection is particularly prevalent among sexually active adults aged 15–34 and is often described as a “silent infection” because most people experience no symptoms at all.
When symptoms do occur, they may include unusual discharge from the vagina, penis, or rectum; a burning sensation when urinating; lower abdominal or pelvic pain; and, in women, bleeding between periods or after sex. However, the absence of symptoms does not mean the infection is absent — untreated chlamydia can lead to serious complications including pelvic inflammatory disease (PID), epididymo-orchitis, and long-term fertility problems.
Gonorrhoea
Gonorrhoea is caused by Neisseria gonorrhoeae. Treatment guidelines for gonorrhoea have changed significantly in recent years due to growing antimicrobial resistance. The current UK first-line treatment, as recommended by the British Association for Sexual Health and HIV (BASHH), is ceftriaxone 1g given as a single intramuscular injection. Azithromycin is prescribed at Access Doctor for gonorrhoea only in specific circumstances, and always in combination with other antibiotics where clinically appropriate, following a thorough consultation.
Azithromycin dosage for STI treatment
The correct azithromycin dosage depends on which STI is being treated. Dosage guidance at Access Doctor follows current clinical evidence and BASHH guidance.
| Indication | Dosage regimen | Duration |
|---|---|---|
| Chlamydia (urogenital) | 1g as an initial dose (2 × 500mg), then 500mg daily | 3 days total |
| Gonorrhoea (specific cases) | 1g–2g in a single dose combined with ceftriaxone | Single-day combination |
| Pregnancy / tetracycline intolerance | Extended course per BASHH guidance (off-label) | As directed by prescriber |
How and when to take azithromycin
Azithromycin should be taken either one hour before food or two to three hours after a meal. This is because food can slow the absorption of the antibiotic and reduce its effectiveness. If you vomit within one hour of taking the tablet, you may need to retake the dose — contact your prescriber for guidance.
- Take as directed — do not skip doses or stop early, even if symptoms improve
- Avoid sexual intercourse for at least 7 days after completing the full course
- Inform any recent sexual partners so they can also be tested and treated
- Abstain from alcohol during treatment to reduce the risk of side effects
- A test of cure is not routinely required for uncomplicated urogenital chlamydia, unless you are pregnant
Azithromycin vs doxycycline for chlamydia
Both azithromycin and doxycycline are effective antibiotic treatments for urogenital chlamydia. They each have distinct advantages depending on the clinical situation. Your prescriber at Access Doctor will determine the most appropriate treatment for you during the consultation process.
| Feature | Azithromycin | Doxycycline |
|---|---|---|
| Treatment duration | 3 days (extended course) | 7 days (twice daily) |
| Dosing frequency | Once daily | Twice daily |
| Suitable in pregnancy | Yes (off-label, extended course) | No — contraindicated |
| Rectal chlamydia | Less preferred | Preferred first-line |
| Patient adherence | Higher (shorter course) | Requires completion of 7-day course |
| Current BASHH preference | Alternative / second-line for urogenital | First-line |
BASHH guidance and the 2025 European guideline on chlamydia management recommend doxycycline as the first-line treatment for most cases of chlamydia. Azithromycin remains a clinically appropriate alternative, particularly where doxycycline is contraindicated — for example in pregnancy, or where adherence to a 7-day course is a concern.
Not sure which chlamydia treatment is right for you? Complete a confidential online consultation and our qualified prescribers will review your health information and select the most appropriate treatment.
View chlamydia treatments GPhC Reg. #9011198 · How it works · Discreet next-day delivery availableSide effects and safety considerations
Like all medicines, azithromycin can cause side effects in some people, though not everyone experiences them. Because the treatment course for STIs is relatively short, side effects are often mild and resolve quickly.
Common side effects
- Nausea, vomiting, or diarrhoea
- Stomach discomfort or abdominal pain
- Headache
- Changes in taste (e.g. a metallic taste)
- Thrush (oral or vaginal) — azithromycin can disrupt the natural balance of bacteria
Who should not take azithromycin?
Azithromycin is not suitable for everyone. You should not take it if you have a known allergy to azithromycin or other macrolide antibiotics, or if you have severe liver or kidney problems. Certain drug interactions also apply — always disclose your full medication list during the consultation, including ciclosporin, warfarin, antacids, and any heart medications.
Azithromycin in pregnancy and breastfeeding
Azithromycin may be used in pregnancy when doxycycline is contraindicated, following BASHH guidance on an off-label basis. If you are pregnant, breastfeeding, or think you might be pregnant, it is essential to disclose this during your consultation so your prescriber can choose the safest option and advise you accordingly.
How to buy azithromycin for STI online in the UK
Access Doctor provides a safe, legal, and regulated route to obtaining azithromycin for STI treatment. Azithromycin is a prescription-only medicine (POM) in the UK — it cannot lawfully be dispensed without a valid prescription issued by a qualified prescriber. Purchasing prescription medicines from unregulated websites is dangerous and illegal.
At Access Doctor, the process is straightforward and entirely confidential:
- Complete a structured online health consultation, disclosing your relevant medical history
- Your consultation is reviewed by a GPhC-registered pharmacist independent prescriber
- If treatment is approved, your prescription is dispensed by our registered UK pharmacy
- Your medication is dispatched in plain, unmarked packaging with no indication of contents
- Next-day delivery is available when you order before 3pm and select a next-day service
Azithromycin for Chlamydia
Prescription antibiotic treatment for confirmed or suspected chlamydia, dispensed by our GPhC-registered pharmacy.
Start consultation →Doxycycline (First-Line)
The current BASHH first-line treatment for chlamydia. A 7-day antibiotic course available following online consultation.
View treatments →When to seek urgent medical advice
Online consultation services such as Access Doctor are intended for treatment of confirmed or strongly suspected STIs in otherwise healthy adults. They are not appropriate for urgent or emergency situations. If you experience any of the following symptoms, seek urgent care — do not wait for an online consultation.
If you are unsure whether your symptoms are urgent, call NHS 111. In an emergency, always call 999.
Ready to get treated? Complete a confidential online consultation with Access Doctor. Prescriptions are issued by GPhC-registered pharmacist independent prescribers. Discreet, next-day delivery available across the UK.
Get azithromycin online GPhC Reg. Pharmacy #9011198 · View all sexual health treatmentsMedical disclaimer: This article is intended for informational purposes only and does not constitute medical advice. All prescriptions issued through Access Doctor are assessed and authorised by GPhC-registered pharmacist independent prescribers. Completing a consultation does not guarantee that treatment will be issued. If you are experiencing urgent or severe symptoms, call 111 or 999, or attend your nearest A&E. This service is not a substitute for in-person medical care where that is required.
Frequently asked questions
Can I buy azithromycin for chlamydia online in the UK?
Yes. Azithromycin is a prescription-only medicine, but you can obtain a legal prescription through a regulated online pharmacy such as Access Doctor. You will need to complete a confidential health consultation, which is reviewed by a GPhC-registered pharmacist independent prescriber before any treatment is approved.
How long does azithromycin take to cure chlamydia?
Most people will clear the infection within 7 days of starting treatment. You should abstain from sexual intercourse for at least 7 days after finishing the full course to avoid passing the infection to a partner. All recent sexual contacts should also be tested and treated.
Is azithromycin or doxycycline better for chlamydia?
Both are effective. Current BASHH guidance recommends doxycycline as the preferred first-line treatment for most urogenital chlamydia infections. Azithromycin is a well-established alternative — particularly useful where doxycycline is contraindicated, such as during pregnancy, or where completing a 7-day course may be difficult. Your prescriber will advise on the most suitable option for you.
Do I need a test before I can buy azithromycin for an STI?
A confirmed positive test is not always required to start treatment, but you must complete a health consultation with our prescribers. If you have already been tested and received a positive diagnosis, you can reference this during the consultation. If you have symptoms but no test result, the prescriber will assess your clinical history and determine whether it is appropriate to prescribe.
What are the most common side effects of azithromycin?
The most commonly reported side effects are gastrointestinal, including nausea, diarrhoea, and stomach discomfort. These are usually mild and short-lived. Because the course used for STI treatment is brief, side effects are less likely to be problematic. If you experience a severe allergic reaction or irregular heartbeat, stop the medication and seek immediate medical attention.
Can azithromycin be used to treat chlamydia in pregnancy?
Yes, azithromycin can be used in pregnancy when doxycycline — the usual first-line option — is contraindicated. It is used as an extended off-label course following BASHH guidance. You must disclose your pregnancy during the consultation so your prescriber can make the safest recommendation and arrange a test of cure after treatment.
Will my azithromycin delivery be discreet?
Yes. All Access Doctor orders are dispatched in plain, unmarked packaging. There is no branding or indication of the contents on the outside of the parcel, and the sender information does not identify the nature of the order.
References & further reading
- UK Health Security Agency (2025). Sexually transmitted infections and screening for chlamydia in England: 2024 report. GOV.UK. Available at: gov.uk
- British Association for Sexual Health and HIV (BASHH). Update on the treatment of Chlamydia trachomatis infection. BASHH Clinical Effectiveness Group. Available at: bashh.org
- White JA, Ison C, Martin I, et al. (2025). 2025 European guideline on the management of Chlamydia trachomatis infections. IUSTI. Available at: iusti.org
- NHS. Chlamydia — Treatment. Available at: nhs.uk
- Specialist Pharmacy Service (SPS) / BASHH / BHIVA. (2023). Azithromycin for the treatment of uncomplicated genital Chlamydia trachomatis: Patient Group Direction template v2.0. Available at: sps.nhs.uk
