Trimethoprim  is the first choice of antibiotics for the treatment of cystitis / urine infection. Trimethoprim 200mg tablets are prescribed as a short course to cure the root cause of cystitis and aid in preventing recurring bouts of the urinary tract infection.

Buy Trimethoprim tablets online without visiting your regular doctor. No appointments are needed to have one of our doctors issue an online prescription for full course of antibiotics from only £13.95, lowest price compared to all other regulated online clinics in the UK.

DrFelix also prescribes Nitrofurantoin capsules for cystitis. All our medicine is dispensed and dispatched in plain packaging from a registered NHS community pharmacy in the UK.

Complete a short consultation before selecting your medication. All our consultations are approved by a UK Medical Doctor.

Summary of available medications

Medication Quantity Price
Trimethoprim 200mg 6 or 12 tablets (1 or 2 courses of treatment) From £13.95

All medications


Medication Quantity Price
Trimethoprim 200mg 6 tablets (1 course of treatment) £13.95
Trimethoprim 200mg 12 tablets (2 courses of treatment) £24.99

All prices exclude prescription fee

What is trimethoprim?

Trimethoprim is an antibacterial drug only available on prescription. It is used for to treat a range of infections and stop the bacteria which is the root problems causing the infection. Trimethoprim tablets are an effective medicine to cure cystitis in women and dampen the side effects associated with cystitis. Trimethoprim is also used to prevent long term recurring urinary infections.


Trimethoprim can’t be taken if you are pregnant, allergic to any of the ingredients, or suffering from a blood disorder or severe kidney disease. Consult a doctor before taking if you have an intolerance to some sugars, a deficiency of folic acid, kidney disease or are having dialysis treatment. Trimethoprim is passed through breast milk, however short term use of this medication should not cause a problem for women who are breastfeeding although they are advised to consult a doctor.

The active ingredient is trimethoprim which prevents bacteria taking up folic acid and consequently inhibits their reproduction.

Take one tablet twice daily for three days.

Side effects of trimethoprim are uncommon but can include:

  • Nausea
  • Vomiting
  • Diarrhoea
  • Loss of appetite
  • Headache
  • Muscle pain
  • Allergic rash

Can trimethoprim be used to treat chlamydia?

No, chlamydia is a sexually transmitted infection and trimethoprim is not targeted at chlamydia bacterium. To treat chlamydia the antibiotic Azithromycin is prescribed as a single dose. You can request chlamydia treatment via DrFelix online without having to see your regular GP or nurse face to face.