Trimethoprim 200mg

Buy Trimethoprim for Cystitis

Good antibiotic treatment for cystitis if the first line treatment nitrofurantoin is not appropriate. Many urinary tract infections still respond well to Trimethoprim, however some bacteria that cause cystitis are becoming resistant to this antibiotic.

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  • Antibiotic for the treatment of cystitis
  • Many cystitis infections still respond well to trimethoprim
  • Alternative treatment when nitrofurantoin is not appropriate
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Trimethoprim belongs to a group of medicines known as antibacterials. They are used to kill a wide range of bacteria that cause infections in your body, primarily urinary and respiratory tract infections. This medicine can also be used for prevention of recurrent urinary tract infections.


Do not take Trimethoprim if you:

  • are allergic (hypersensitive) to trimethoprim or any of the other ingredients listed in the patient information leaflet
  • are pregnant
  • suffer from severe liver problems
  • suffer from any blood disorders such as anaemia
Pregnancy and Breastfeeding

Trimethoprim should not be used in pregnancy. DO NOT take Trimethoprim tablets if you are pregnant. If you are breastfeeding, ask your doctor for advice before taking this medicine.

Important Interactions

You must tell your doctor if you are taking, have recently taken or might take other medicines, in particular:

  • repaglinide, used to treat diabetes
  • procainamide, to treat abnormal heart rhythm
  • digoxin, to treat certain heart conditions
  • potassium supplements
  • medicines known as ACE inhibitors and angiotensin II antagonists (used to treat high blood pressure and certain heart conditions)
  • heparin (used to treat and prevent blood clots)
  • diuretics (water tablets such as furosemide, eplerenone, spironolactone, amiloride or triamterene)
  • rifampicin (antibiotic), used to treat TB
  • anticoagulants (to prevent clots from forming in the blood e.g. warfarin)
  • phenytoin, to treat epilepsy
  • pyrimethamine and dapsone, used to treat malaria
  • immunosuppressant drugs - used in cancer treatment (e.g. methotrexate) or to treat organ rejection after transplant (e.g. azathioprine or ciclosporin)
  • bone marrow depressants
  • spironolactone
Side Effects
  • hyperkalaemia (particularly in the elderly and in HIV patients) which is high levels of potassium in the blood (may result in abnormal heart rhythm)
  • headache
  • skin rashes
  • hives
  • thrush
  • nausea, diarrhoea, vomiting
Please Note

All medication can cause side effects. We have only listed a few to be aware of. Details of all side effects, including rare side effects to be aware of, are listed in the patient information leaflet (PIL). When completing your medical questionnaire, it is very important that you answer the questions truthfully. This is to ensure your doctor has a full picture of your medical history before prescribing. List all medicines you are already taking, including non-prescription and herbal medicines.


Whilst some cystitis infections may clear up of their own accord, you can ease symptoms by drinking 2-3 litres a day to flush the bladder and by taking cranberry tablets which are available from your pharmacy. Nitrofurantoin is the first line treatment antibiotic available.

Looking after your medicine

Do not take medicines after the expiry date stamped on the pack. Keep all medicines out of the reach and sight of children.

Medicines are only intended to be used by the person they are prescribed for. Do not give your prescribed medicine to anybody else, even if they have the same symptoms as you. Medicines can be harmful if used by anybody other than the person they have been prescribed for.

References Trimethoprim 200mg Patient Information Leaflet
British National Formulary: trimethoprim
Last reviewed & updated  27/04/2020   Authored  04/09/2009

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