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How long for the antibiotic Trimethoprim to work for bacterial bladder/UTI infection?

Posted by sweetie

Im female and 20. I had a bubble bath about 5 days ago, which I knew I shouldn't have had because I used to have previous kidney problems (completely now healed) and when I have a bath the perfume always makes me get an inflammation/infection.


So I had a long hot bubble bath with very perfumed products. Around that time and after I had no symptoms at all, apart from going more and more often to go to the toilet.


The day before yesterday I was starting to go to the toilet every 10-15 mins and I felt like I really couldn't empty my bladder at all, and sometimes the urine was leaking out a bit aswell. I got a fever (around 37.5 - 38 on digital thermometer) aches and pain in my lower abdomen and back and feeling a little unwell.


Yesterday I felt worse, I felt very ill and my pains were very uncomfortable and I still couldnt stop going to the toilet to pee, but hardly anything at all was coming out. So I went to my doctors last night and she didn't really know what was wrong. She took a urine sample from me and tested it with a dipstick, but it showed no infection, so she said it could just be an irritation/inflammation of the bladder? Yet I had a slight fever aswell..... She ruled out thrush and things like that, because I have not had any bad itching.


So I took my first tablet last night at about 8.30pm and I have been drinking alot of water and Cranberry juice, also not eating junk food, caffeine or alcohol. I took my second tablet this morning at 8.30 and I will take my next one at dinnertime, maybe between 6 - 8.30pm, would that be ok?


So I don't feel any different today, still feeling hot and then shivering cold, some aches in lower abdomen and back, full bladder feeling, frequent urination - although maybe a little less today, and a slight nauseous feeling and headache.


So how long will it take for this to work and will I feel worse before I get better? I only have a 3 day course to take.

Answers (1)
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Simple cystitis will improve greatly within 24 hours of starting antibiotics. Trimethoprim will cure cystitis infections in about 90% of cases. It is the antibiotic doctors prescribe most frequently for cystitis. If symptoms are not improving in the first 24 hours, or have not gone completely at the end of 3 days, medical advice is needed. If symptoms worsen rather than improve medical advice is needed straight away. In your case I would seek medical advice from your MD or GP immediately.

Further information on Trimethoprim from Dr Fox website.

NOTICE: The information provided on this site is not a substitute for professional medical advice, diagnosis, or treatment. Never delay or disregard seeking professional medical advice from your physician or other qualified health provider because of something you have read on Wellsphere. If you have a medical emergency, call your doctor or 911 immediately.
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