Azithromycin is a generic antibiotic treatment indicated for various types of bacterial infection, including chlamydia.

If you’ve tested positive for chlamydia, you can order the treatment you need with our secure online consultation service. Take our questionnaire to have your request reviewed by our doctor.

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Azithromycin is a generic antibiotic treatment indicated for various types of bacterial infection, including chlamydia.

If you’ve tested positive for chlamydia, you can order the treatment you need with our secure online consultation service. Take our questionnaire to have your request reviewed by our doctor.

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Product information

Azithromycin is an antibiotic medicine, containing an active ingredient of the same name. Following its development, it was marketed by Pfizer under the brand name Zithromax in the early 1990s. The medicine is employed by doctors to treat a range of bacterial infections, including chlamydia. It is a generic drug and therefore it may be supplied by the manufacturer in a box which is different to the one pictured above.

The most common sexually transmitted infection in the UK, there are over 100,000 cases of chlamydia reported to the NHS every year. The illness is caused by a bacteria called chlamydia trachomatis, and is passed from one person to another through unprotected intercrouse.

Symptoms of chlamydia include pain, irregular vaginal or penile discharge, or increased menstrual bleeding in women; however it is thought that around three quarters of female cases and half of all male cases will be asymptomatic, producing no visible effects. This makes it doubly important to get tested if you have had unprotected with multiple partners, or think you may have come into contact with the disease.

As a macrolide antibiotic, Azithromycin works by combatting the bacterial cells responsible for spreading infection. These bacteria increase their number through self-reproduction. To do this, they must generate a protein, which facilitates the correct conditions for them to multiply. The antibiotic works by inhibiting the production of this protein. Once the bacteria can no longer develop its presence, it becomes susceptible to the body’s natural defences, which kill the infection.

For the the treatment of STIs and urethral infections, only one dose of Azithromycin may be needed.

Active Ingredient

The main agent in Azithromycin is an antibiotic substance of the same name. It belongs to the macrolide category within this medicine, and has a versatile range of uses in treating bacterial infections. It works by stopping the bacteria causing the infection from developing and spreading, which it does by interfering with the process of protein synthesis.

These bacteria require the generation of certain proteins, to be able to copy their genetic material and multiply. Once their capacity to do this has been inhibited, their growth pattern comes to a halt, and the immune system destroys what remains of the bacteria.

How to buy chlamydia treatment online

If you suspect that you may have chlamydia, you should go to your GP or local sexual health services (GUM clinic) to get tested as soon as possible. It’s important to remember that chlamydia doesn’t always cause symptoms, so even if you don’t notice anything wrong you should still get tested. You can also order a test kit online from our STI Test Kit page.

If you have received a positive test result for chlamydia, you can buy Azithromycin online using our confidential service. Our service is staffed by registered prescribers, who will review your case. Once your order has been approved by them, it will be dispensed from our UK pharmacy and delivered by next-day courier.

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Page last reviewed:  17/04/2018


When you use this medicine, make sure you follow the instructions provided by your prescriber, and that you read the information leaflet supplied. Doing so will help to lower the risk of potential side effects, and enable you to get the best out of your medicine.

  1. Take as prescribed.
  2. For chlamydia, this might be a one-off dose of 1000mg (2 x 500mg tablets).
  3. Ensure you swallow the tablets whole. Do not chew them or break them up.
  4. Take Azithromycin with water.
  5. Never use more than the prescribed amount.

Consult the leaflet provided for more information.

Page last reviewed:  17/04/2018
Please read the patient information leaflet for this medicine fully before use:

Azithromycin 500mg

Side effects & Warnings

Side effects

Only a minority of people using this treatment will experience side effects. Despite this, it remains important to be aware of the potential side effects the medicine may cause, so that you can seek treatment right away if necessary.

Very common (1 in 10 people or more):

Abdominal pain, diarrhoea, feeling sick.

Common (1 in 10 people or less):

Loss of appetite, dizziness, headache, pins and needles, sight or hearing problems, indigestion, skin irritation, joint pain.

Uncommon (1 in 100 people or less):

Fungal or bacterial infection, pharyngitis, breathlessness, chest pain, gastroenteritis, vaginitis, pneumonia, hypersensitivity, nervousness, drowsiness, insomnia, palpitations, facial flushing, constipation, hepatitis, allergic skin reactions, painful or difficult urination, fever.

Rare (1 in 1,000 people or less):

Agitation, kidney problems.

This is not a complete list of the side effects associated with this treatment. A more detailed account can be located in the patient information leaflet. If you notice any side effects of experience anything at all unusual while taking this medication, visit your nearest doctor or healthcare professional immediately.

Taking it with other medicines

You should inform your doctor during consultation of any other medicines you are currently using, as these may affect your suitability for this product.

Azithromycin may interact with the following: antacids, ergotamine, statins, warfarin, cisapride, terfenadine, zidovudine, nelfinavir, rifabutin, quinidine, cyclosporin, alfentanil, theophylline, digoxin, astemizol and pimozide.

Conditions to look out for

Before taking this medicine, let your prescriber know if you have a history of any medical conditions, including: liver or kidney problems, heart problems, low potassium or magnesium, myasthenia gravis, or nervous or mental illnesses.

Pregnancy and breastfeeding

This medication should not be used during pregnancy unless deemed absolutely necessary by a doctor. It is not suitable for use during breastfeeding. If you are pregnant, breastfeeding or trying to conceive, speak to your doctor for specific advice.

Driving and using machinery

Do not drive or attempt to operate machines if you experience side effects such as dizziness, or anything which could inhibit your concentration.

Lactose intolerance

Tell your prescriber if you have any sugar intolerances, as this medication contains lactose.

Nut allergy

Some brands of azithromycin are not suitable for people with nut allergies. Let your prescriber know if you have an allergy to nuts, or anything else.

Page last reviewed:  17/04/2018
Please read the patient information leaflet for this medicine fully before use:

Azithromycin 500mg


Can I still drink alcohol?

Alcohol can interact with certain types of antibiotic. Despite there being no specific information available regarding the effect of alcohol on Azithromycin, we would recommend abstaining from drinking alcohol during its use.

Will I still be able to drive?

Your capacity to drive should not be affected. However, if you notice any side effects which may make doing so dangerous, do not drive and consult your nearest GP or hospital for advice.

Can I take the medicine while pregnant?

If you have tested positive for chlamydia and are pregnant, breastfeeding or trying to get pregnant, we recommend you see your doctor in person.

How should I store it?

In a sealed, dry environment, under 25°C.

Am I allergic to anything in the medicine?

Do not use this product if you are allergic to any of the following: azithromycin, croscarmellose sodium (E468), magnesium stearate (E572), microcrystalline cellulose (E460), silicium dioxide, (E551), poloxamer, povidone (E1201), talc, waterfree lactose, chypromellose (E464), hydroxypropylcellulose, macrogol and titanium dioxide (E171).

Some versions of this medicine may not be suitable for people with nut allergies. 

Is it available over-the-counter?

No. You can only buy Azithromycin in the UK if you have a prescription from a registered doctor.

Getting chlamydia treatment online

Please note that we can only provide treatment to patients who have had a positive test result for chlamydia. If you haven’t been tested, you can order a test kit online from us here. Otherwise, we recommend you visit your nearest sexual health clinic as soon as possible.

Patients who have tested positive for chlamydia can buy their treatment online with our simple and secure service. Click ‘Buy now’ to proceed to our medical consultation and have your case reviewed by our doctor. Approved orders are dispensed at our UK pharmacy and shipped by tracked courier.

Page last reviewed:  17/04/2018
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