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Doxycycline for Chlamydia

Chlamydia | Active ingredient(s): Doxycycline hyclate | Manufacturer: Various

For STIs: take one tablet twice a day, for seven days.
For malaria: take one tablet per day. Start two days before travelling and continue for 28 days after returning.

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  • Review by a qualified doctor
  • Including prescription
  • Next-day delivery included

Buying Doxycycline Online

You can buy Doxycycline online here without a face-to-face appointment. To start your course as soon as possible, complete a consultation before 4.30pm for free next day delivery across the country.

To ensure that our doctors have all the right information regarding your current health, we ask all our patients to complete a straightforward online consultation form, similar to questions you would be asked in-person during a doctor's appointment or STI check-up. A prescription for your chlamydia treatment will be sent straight to the pharmacy for speedy delivery. All orders with 121doc include a free consultation and next day delivery.

What is Doxycycline?

Doxycycline is a tetracycline antibiotic used to treat a number of bacterial infections, one of the most common being the STI chlamydia. It can also be used as a preventative treatment for malaria. Doxycycline is a versatile medication and can also cure non-specific urethritis, mycoplasma genitalium and ureaplasma urealyticum.

For treating the sexually transmitted infections, Doxycycline is highly effective at a success rate of 90% and easy-to-take over the course of just one week. This is a more appropriate medication option for individuals who are sensitive and experience side effects with high dosages of medications as each capsule is 100mg. Alternative treatment for chlamydia is Azithromycin, which is available in two capsules of 500mg each to be taken immediately. Both are effective and require you to refrain from sex for the following 14 days to ensure the antibiotics have worked. You can go for another free NHS STI check-up at your local sexual health clinic or GUM clinic to ensure the medication has been completely successful.

More About Chlamydia

Chlamydia is very common in the UK and completely curable with the right antibiotics. This is especially important for women as chlamydia is symptomless for the vast majority of male and females but may cause long-term difficulties without curing the infection, such as infertility and pelvic inflammatory disease (PID). For more information on chlamydia and the treatments available, visit our chlamydia information page.

How does Doxycycline work?

Doxycycline is classed as a tetracycline antibiotic meaning it is a four-ringed molecular structure. Tetracycline medications tend to be used to treat multiple bacterial infections that can include acne, urinary tract infections and a range of STIs. At 121doc, we prescribe Doxycycline for the treatment of the STIs mentioned above and malaria as a preventative treatment taken daily when you're visiting a country prone to the virus.

This highly effective chlamydia treatment that prevents the spread of bacteria that causes sexually transmitted infections. So it doesn't directly cure the infection but aids your body's immune system:

  1. Stops the production of protein that helps to spread the bacteria.
  2. This allows your body's immune system to attack the infection, which finally kills it.

How do you take Doxycycline?

Taking Doxycycline capsules is simple and 90% effective. Whilst this is a high percentage, it is advised to not have sexual intercourse for two weeks (14 days) after finishing the course to make sure the antibiotics have taken effect. You can also request an additional follow-up test to make sure the infection has cleared.

  • Take one capsule twice daily for a period of seven days
  • If you miss a dose, take it as soon as you remember
  • Continue the whole course, even if you feel better

Doxycycline gets to work very quickly, but it's very important to remember to take this treatment every day, even if you start feeling better in order to treat chlamydia successfully. If you would like to take an STI test in order to see if the bacterium has been fully removed, it is recommended that you wait for a two-week period before doing so.

Doxycycline dosages for chlamydia

There is one optimum dose for chlamydia, non-specific urethritis, mycoplasma genitalium and ureaplasma urealyticum and that is 14 capsules at a 100mg dosage each. This dose is ideal if you tend to experience side effects with prescription medications.

Doxycycline Side Effects

This treatment is highly effective in a low dose and unlikely to cause serious side effects, which is why it is so widely prescribed. In fact, individuals that can't take high dosages such as Azithromycin will be prescribed Doxycycline. The most common effects may include diarrhoea, thrush, vomiting, heartburn, abdominal pain and sensitivity to light. If you're experiencing diarrhoea, it is often advised to steer clear of using diarrhoea capsules as these could make the side effect worse when taking Doxycycline as well.

These shouldn't be a cause for concern, but if these side effects persist or you start to develop anything more serious, you should seek medical help straight away.

An allergic reaction to Doxycycline needs prompt medical attention. Symptoms include a fever, hives, rash, joint pain and fatigue. This could also be a result of the body combatting the medication; a condition called autoimmune syndrome.

Women should also be aware that Doxycycline can reduce the effectiveness of your oral contraceptive, especially if it contains oestrogen. Please check with your doctor and use additional protection such as condoms for the remainder of that cycle.

Doxycycline Precautions

Doxycycline is used widely and is suitable for most people, however you will not be prescribed this if you are pregnant or breastfeeding. You should also not use this medication if you have sensitivity to doxycycline, minocycline or tetracycline. If you are currently taking vitamin or mineral supplements, you should mention this to your doctor, as these types of treatments have been known to render the drug less effective. This includes medications or supplements containing calcium, aluminium, magnesium and iron.

Regarding the sensitivity to light under Doxycycline side effects, exposure can cause a rash, redness or itching so try to refrain staying out in the direct sunlight and wear protective clothing.

Although this is rare, Doxycycline may cause intracranial hypertension in women who are overweight, childbearing age and there is a family history of the illness. Symptoms of intracranial hypertension include changes to your vision including blurred vision and headaches. If you're experiencing this, visit your doctor.

If you're experiencing symptoms of your infection, if this doesn't improve by the time the course is up, seek help from your doctor.

STI Protection

It's important to remember that you can get chlamydia and any other STIs again if you don't take the necessary precautions. The only contraception that diminishes your chances of catching infections is wearing a condom.

If you are sexually active, particularly with multiple partners, you can get tested for free at the appropriate STI Clinics or GUM Clinics across the UK. There might be a wait to be seen but the check-up is quick and you can get complete cover and free condoms too.

Note: You must complete a short online consultation so that our doctor can ensure that the treatment is suitable for you. The above pricing should only be used as a reference. The final decision to issue this treatment lies with the prescribing doctor.


What is included in the online consultation?
Will a doctor review my consultation?
What happens after I submit my order?
Is the price all-inclusive?
Can I place more than one order at a time?
What are my delivery options?
Is it safe to buy prescription medication online?
How do I know which treatment is best for me?
Is this service discreet?
What is included in the online consultation?

Our consultations include general questions about your health (e.g. blood pressure levels, current and past conditions), as well as specific questions related to your selected treatment. We will also request relevant personal information to complete payment and delivery.

All questions are necessary, and your answers and details will not be shared with any third-parties. Only our doctors have access to your medical information.

Will a doctor review my consultation?

It is a legal and medical requirement that a doctor first reviews all completed consultations. We have a team of in-house doctors and specialists who will ensure your selected treatment is safe for your use. All information is stored securely and confidentially.

Please note, we do not guarantee that our doctors will approve treatment.

What happens after I submit my order?

Your consultation will be sent directly to our medical team, where it will be reviewed by one of our doctors.

If your chosen treatment is deemed suitable for your use, they will issue a prescription. Your prescription is then forwarded to our pharmacy, where your medication will be dispensed and dispatched for courier delivery.

Is the price all-inclusive?

Yes. All 121doc orders include a medical consultation, a prescription and next-day delivery. There are no additional costs. We believe in providing a safe and easy-to-use service.

Can I place more than one order at a time?

Yes. However, certain medications may negatively interact with each other. Our doctors may not approve your order on this basis.

You can place multiple items in one basket, and complete a consultation for all.

If you wish to place a second order for a different medication, you will have to complete a separate consultation.

What are my delivery options?

We offer several delivery options:

  • Next-day delivery
  • UPS Access Point - convenient parcel drop-off and collection near your home or work address
  • Nominated-day delivery - choose the most convenient day for delivery

All these options can be tracked and require a signature on delivery. If you are not available, a friend or relative can sign in your place.

None of these options will incur an additional charge.

Is it safe to buy prescription medication online?

To ensure you are purchasing from a reputable company, you should look to see their country’s regulatory bodies verify them.

In the UK, this is the Care Quality Commission (CQC) and the Medicines and Healthcare products Regulatory Agency (MHRA).Certificates can be viewed here.

How do I know which treatment is best for me?

Some treatments also offer the 'Advise Me' function. You will be asked questions about your lifestyle and needs, plus medical questions. You will then be presented with the advice of our doctors.

Is this service discreet?

Our patients’ privacy is of utmost importance. All your medical information is securely stored and only viewed by our doctors. We do not share your details with third-parties. We are also regularly inspected by various UK regulatory agencies, such as the Information Commissioner's Office (ICO).

All orders will only show on invoices, bank statements, etc. as ‘HHC Ltd’.

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How does it work?

Select Select your treatment and complete our online consultation.
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Select a condition here or use the top menu. For every condition, we provide you with information as well as the treatments we currently offer. If you don’t know which is best for you, just click the 'Advise-me' button.


If you know what you want, the quickest way to find a specific medication is to use the search bar here.


Every order starts with an online consultation. We will ask you medical questions to make sure only treatment that is safe and effective is prescribed. We take into account your lifestyle, health and any other medications you’re currently using.

The consultation is completely free, and takes between 5 and 10 minutes of your time.

All your information is safe with us. We don’t share it with anyone unless you want us to.


If you need any guidance, you can call, message or email our customer service team via the ‘How can we help you?' section here.

Prescribe Our doctors review your order.
Free prescription


As soon as you place the order, one of our doctors will review your consultation. On working days, this usually takes around one hour.


If the doctor has any additional questions, you will receive a phone call and an email. We understand you might be at work or busy. Our customer service representatives are always discreet and can call back at a more convenient time if necessary.

Our emails never contain any personal or medical information, only a link to your private account on our website (where you will find your messages).


Once our pharmacy receives your prescription, you will get a second email with your package tracking code.

Deliver Expect your delivery the next working day.
Always free. Discreet packaging.
Free next-day delivery


All orders include next-day delivery. Alternatively, you can select a delivery date that suits you better.


We also provide a free UPS Access Point service. Pick up your package from one of many collection points across the UK.

With your tracking code, you will know the estimated delivery time. All we need is your signature (or a friend‘s or relative’s).


All parcels are plainly labelled; there is no logo or any indication of its contents. Inside, you will find your treatment as well as a patient leaflet in your chosen language.

Repeat Subscribe and save with our repeat service. Never miss a dose again.
10 to 15% off


With 121doc’s Subscribe & Save service, you can automatically receive your treatment every few weeks or months.

The order will be generated by us, using the information you provided (including delivery frequency). You don’t have to do anything. Payment is taken two days before shipping.


There are two ways to subscribe. The first is during the order process. The second is via your profile here.

You can cancel or amend your repeat prescriptions at any time.


There are no sign-up fees with this service. Plus, you get a 10% discount off all future prescriptions, increasing to 15% after six orders!