How to use trimethoprim
As soon as you recognise the cystitis symptoms as previously diagnosed by your doctor, you should start the course of trimethoprim provided. Take one, 200mg tablet twice a day. The tablet should be swallowed with a full glass of water at the same time each day. If the cystitis you are suffering from is caused by a bacterial infection, your symptoms should improve within a couple of days, and you should complete the course to ensure all of the infection is treated. You should also drink lots of fluid.
It is possible that your symptoms are not caused by a simple bladder infection, however. If so, the treatment provided will not improve your symptoms and they may worsen. In this case, it is very important that you visit your GP immediately to investigate the cause. You should, however, continue the course of antibiotics unless your GP directs otherwise.
What are the side effects of trimethoprim?
Like all medicines, trimethoprim can cause side effects. Most commonly these include nausea, vomiting, diarrhoea or an allergic rash. It is possible to be allergic to trimethoprim, and this can cause anaphylaxis and other serious problems, so you should not take trimethoprim if you are allergic to it.
This antibiotic shouldn’t be taken if you have certain blood disorders, liver or kidney problems, or if you are taking certain medicines from your doctor, such as methotrexate.
You should consult the full list of side effects on the leaflet provided with your treatment prior to taking trimethoprim. Details of this can also be found here.