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Buy Trimethoprim after completing our online consultation for cystitis

6 tablets (£11.99)

Prices include next-day delivery and prescription

6 tablets £11.99

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Please note that the first line treatment for cystitis that is caused by a bacterial UTI is Nitrofurantoin, as there is quite a high bacterial resistance to Trimethoprim. Therefore it is wise to only use Trimethoprim to treat a UTI after a urine test has confirmed that the bacterial strain causing the infection is sensitive to Trimethoprim. Please note that this treatment is currently only offered for female patients. If you are male and are experiencing symptoms of a urinary tract infection, you should visit your GP or a sexual health clinic as this could be a sign of another infection or a more serious underlying problem.

More information about Trimethoprim

What is Trimethoprim?

Trimethoprim is a medicine that effectively treats bacterial infections.

It is commonly used to help with cystitis (a type of urinary tract infection, or UTI). This infection can happen when bacteria from the outside of your body get into the urinary tract.

UTIs can cause uncomfortable symptoms, such as a burning feeling when urinating and abdominal pain.

By taking Trimethoprim, you can stop the infection from spreading so your body can fight it off.

At HealthExpress, you can buy 200mg Trimethoprim tablets. Please note: Trimethoprim is not the first-line treatment for cystitis. You will require a urine test before ordering this medicine online.

Please note - orders approved before 4:30 pm Monday to Friday (excluding weekends and bank holidays) will be received the next day.

How does Trimethoprim work?

Trimethoprim works by stopping the bacteria from growing, which slows down the spread of the infection. This makes it much easier for your body’s immune system to fight it off.

It is important to treat cystitis as soon as you feel it. By delaying treatment, you risk the infection spreading to your other organs, such as the bladder and kidneys.

When you start taking Trimethoprim, your symptoms might go away quickly. Even if you feel completely better, make sure you finish the course.

If you don’t finish the entire course of medicine, there is a risk that the infection will come back.

What are the benefits of Trimethoprim?

A medicine like Trimethoprim will quickly stop all the uncomfortable symptoms that come with a UTI.

The treatment works very quickly, meaning your symptoms will improve within hours of taking the medicine.

It is also:

  • clinically tried and tested
  • low in risk of side effects

How do I use Trimethoprim?

You should start using Trimethoprim as soon as you realise you have cystitis. The sooner you start treatment, the better.

To take the medicine, swallow the tablet with water - do not crush or chew it.

How much medicine you take depends on your infection. Your doctor or online health provider will give you the amount that’s best for you.

The usual dosage instructions are as follows:

  • To treat an acute cystitis infection, take 200mg twice daily for 3 days.
  • To prevent frequent UTIs, take 100mg once daily before bed.
  • To prevent a recurrent infection after coming into contact with a trigger, take one 200mg tablet.

When taking any medicine, make sure you finish all the tablets you have been given. Stopping the medicine early might cause the infection to come back.

Also, make sure you read the patient information leaflet (PIL) that comes with your treatment.

What if I forget to take a tablet?

Don’t panic if you forget to take a dose of your medicine. Just take your tablet as soon as you remember it.

If you’ve forgotten about it all day, it will be best to skip it completely. Continue taking your medicine as normal - you will just finish the course of treatment one day later than planned.

Once again, never take two tablets together.

What are the potential side effects?

As with all medicines, there is a risk of side effects.

If you do experience any, they normally go away once you’ve finished the course of medicine.

Here is a list of some of the common side effects:

  • loss of appetite
  • sore throat
  • skin rashes
  • diarrhoea
  • anaemia (feeling tired and weak)

If you experience rare side effects that haven’t gone away, contact your doctor as soon as possible.

If the medicine causes an allergic reaction (swelling of the face or breathing difficulties) seek immediate medical attention.

What precautions should I take?

Before taking Trimethoprim for the first time, make sure none of the following apply to you:

  • you have a folate deficiency
  • you have kidney or liver problems
  • you are allergic to the medicine’s active ingredients
  • you are pregnant or breastfeeding
  • you have acute porphyria
  • you have a vitamin deficiency
  • you have a blood disorder
  • you have diabetes

Some medicines can have bad reactions with Trimethoprim. Tell your doctor if you are taking any of the following treatments:

  • repaglinide (for diabetes)
  • diuretics
  • digoxin (for heart problems)
  • anticoagulants (for blood clots)
  • ciclosporin
  • rifampicin (for tuberculosis)
  • pyrimethamine (for malaria)

Other precautions

If there is a chance that you may be pregnant, do not take Trimethoprim.

This treatment can have very harmful effects on an unborn baby, especially in the early stages of pregnancy. It can affect the development of the baby’s brain and spine.

Trimethoprim can also pass into your breast milk, meaning you might accidentally give the treatment to your baby. This is unlikely if you take the medicine for a short time. However, always check with your doctor before taking any treatment.

It is safe to drink alcohol while on Trimethoprim. However, drinking too much alcohol whilst on it can increase your risk of side effects.

For questions about this medicine, ask your doctor or look through the patient information leaflet (PIL).

Can I buy Trimethoprim tablets safely online?

You can buy Trimethoprim tablets safely online at HealthExpress.

Simply fill out the online form to complete your consultation, which will be reviewed by one of our UK-registered doctors.

If it is safe for you to take the treatment, we will send your order right to your door on the following day.

Trimethoprim info
Product nameTrimethoprim
Active ingredient(s)Trimethoprim
ManufacturerCrescent Pharma
Lowest price£11.99
Trustpilot rating4.8/5
Trustpilot reviews588
AvailabilityIn stock
DescriptionTrimethoprim is an antibiotic that is used as an effective treatment for the bladder infection cystitis.
ExemptionSubject to medical prescription
Available dosage(s)100mg, 200mg
ApplicationWomen over 18 with the symptoms of cystitis
UsageTake 1 tablet twice a day for up to 14 days
Drug classSulfonamides and folic acid inhibitors
Alcohol consumptionNo influence
Breastfeeding/pregnancyCaution is recommended, ask your doctor

Note: Decisions about treatment are for both the prescriber and the person to jointly consider during the consultation. However, the final decision will always be the prescriber’s.

Trimethoprim FAQs

What is Trimethoprim used for?

Trimethoprim is an antibiotic used to treat infections of the urinary tract (UTIs) and respiratory tract.

How effective is Trimethoprim for a urinary tract infection (UTI)?

Trimethoprim is one of the most effective and commonly prescribed treatments for a UTI. Clinical studies have shown it is over 90% effective within 3 days of treatment with a low risk of adverse effects.

Can Trimethoprim cure chlamydia?

No, Trimethoprim is not prescribed for Chlamydia. Antibiotics such as Azithromycin and Doxycycline are more effective for chlamydia.

Does Trimethoprim contain penicillin?

No, Trimethoprim contains the active ingredient of the same name. It belongs to a different class of antibiotics.

Can you buy Trimethoprim over the counter?

No, Trimethoprim is only available on prescription.

Should Trimethoprim be taken with food?

Trimethoprim can be taken with or without food.

Why do I need to take Trimethoprim at night?

Taking Trimethoprim at night has been found to promote better drug absorption in the body, especially for those who have chronic UTIs and are trying to prevent symptoms. The dosage for prevention is one 100 mg Trimethoprim tablet each night. We do not offer this dose at HealthExpress and you must speak to your doctor if you are experiencing frequent UTIs.

How long does Trimethoprim take to work?

Trimethoprim typically starts working within a few days, but it may take up to a week for the full effects to be seen. Even if you start to feel better, you must take the full course of treatment to ensure success. If you are still experiencing symptoms after taking Trimethoprim for a week, speak with your doctor.

Can Trimethoprim make you dizzy?

Yes, dizziness can occur in some people it is a very rare side effect. However, you should still wait to drive or operate heavy machinery until you know how Trimethoprim affects you.

Can you drink alcohol with Trimethoprim?

Yes, you can drink alcohol whilst on Trimethoprim. However, the effects of the alcohol may make any side effects you're experiencing worse. It's always best to drink in moderation.

Can you take paracetamol with Trimethoprim?

Yes, you can take paracetamol whilst on Trimethoprim to alleviate any discomfort from the UTI.

Can you take Trimethoprim and Nitrofurantoin together?

Whilst some research has shown them to work effectively together, taking either Trimethoprim or Nitrofurantoin on its own is effective in treating a UTI. You should never take two antibiotics together without consulting your doctor first.

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Trimethoprim reviews
Excellent 4.8 588 patients have reviewed Trimethoprim on Trustpilot
Featured reviews review
  • Very happy with this medication. As prescribed by my consultant, I take Trimethoprim as a prophylactic treatment to prevent re-current cystitis/urethritis. I have been buying on-line from HealthExpress UK for the past two years and have been problem-free the whole time!

    P. A
  • This is a very cheap medication going back to the early days of antibiotics, but it is very efficient at treating acute cystitis, and this is probably why it hasn't been replaced with one of the newer antibiotics. My symptoms improve after taking the first tablet of the 3 day course. I always make sure I have a course of treatment with me whenever I'm away from home. I have never experienced any side effects from the medication.

  • The product was spot on i beleive everyone KNOWS their own body and when something is just not quite right. Heath Express got my medication for me and delivery was FAST, ITS very Difficuilt these days to get Appointments at your Surgery sometimes 3 weeks wait. i know its the pandemic has made it worse for everyone so i appreciate the extra help, the medicine has taken way the Pain in my tummy next to my bladder and has stopped me weeing every 5 minutes would not hesitate to call or e- mail and if the Doctors can help they will provided they have the information they need Thank You.

    Jacqueline Q
  • This medication works like magic, after taking only 3 of the tablets, the cystitis has gone. Wonderful for me. Thank you so much for your help, my mind is at rest I will have it with my on my forthcoming holiday, when if I need it, I have it there. Many thanks

    T S
  • I have suffered with cystitis all my life I have taken trimethoprim and clears it quickly . Sometimes I need a seven day course but it takes the really bad symptoms away in a couple of days

    Arlene D
  • I had prostate surgery some years ago, and things were never right after that. Although my condition is largely controlled by Finasteride and Tamsulosin, I am prone to UTIs, and Trimethoprim is vital to me when they occur. Fantastic.

    Gerald R
  • the tablets which I have had from my GP before for recurrent cystitis , worked after two days , This is a good service for me since living in a village would;d mean a taxi each way , Tablets were delivered the next day at 9am.

    Mrs Mitchell
22 Apr

Brilliant and cured my problem !!

Lorraine H
20 Apr

Very easy to order and very fast delivery next day

Maxine W
28 Mar

Fast efficient service

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