Trimethoprim 200mg

Trimethoprim 200mg treatment for cystitis – for recurring infection. Be prepared with a standby antibiotic to keep for when needed.

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Trimethoprim 200mg

Trimethoprim 200mg

Prescription fees

Medicinesbymailbox supplies medicine on prescription and charges a small prescription fee based on the order value of each prescription.Prescriptions are issued by our doctors online and sent electronically to our pharmacy.If you have your own private paper prescription please post to our pharmacy (details).

Order value Prescription fee
Any Order Value £0.00

Trimethoprim product information

Trimethoprim belongs to a class of medicines called antibiotics. It is particularly used in urinary tract infections, including cystitis, which is a bladder infection. Trimethoprim works by stopping the growth of the organisms responsible for the infection.

How to take

It is important to follow the directions being specified by your doctor. The usual dose for bacterial cystitis is to take one tablet daily, for 3-14 days, depending to the type and severity of the infection. 

Side effects of trimethoprim

Like all medicines, trimethoprim can cause some side effects, although not everyone gets them.
The most common side effects include feeling or being sick, and itchy skin rash. Side effects are usually mild but if you are concerned, you should consult a doctor or pharmacist for advice. 
Long term use of trimethoprim, although not the case here, is associated with some blood disorders. If you experience unexplained bruising, nose bleeds, sore throat or infection, you should stop taking it and seek urgent medical advice.


During a consultation with Medicinesbymailbox, you will be asked to complete an online assessment questionnaire to determine your suitability for the medication. You should NOT take aciclovir without consulting a GP if you:
  • Are allergic to trimethoprim
  • Are pregnant
  • Have any blood disorders
  • Have severe liver or kidney disease
Breastfeeding women may take trimethoprim. However, you may want to speak to a doctor of pharmacist for advice before taking it.

Some medications can interact with how trimethoprim works, for example antibiotics such as rifampicin, the blood thinning medicine warfarin and digoxin which is used for heart conditions. If you are taking other medications that you are unsure, please consult a doctor or pharmacist.

Patient information leaflet

The 'patient information leaflet' that is provided with the medication should be read before taking the tablets.