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Common side effects of SULFAMETHOXAZOLE-TMP.

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Hi! So recently I've been put on a new antibiotic. Have taken 3 so far. It's called sulfamethoxazole-tmp. I was wondering how common the side effects are.

Category: Internal Medicine Specialist

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Category: HIV- AIDS Specialist
 27 Doctors Online

Thank you for your query at
I understand your concern.
TMP-SMX or Cotrimoxazole is the main name of the antibiotic you mentioned, and is mostly well tolerated.
It has a low side effect profile with most common complaints being vomiting, headache, diarrhoea, rash ( very rare), and sometimes hyperkalemia in patients on other potassium sparing medicines.
It is a safe drug, and used for resistant UTIs.
Are you experiencing any side effects, let me know and I can help you further.

Patient replied :

Great, thank you for your help. I'm not having any side effects currently. Does the hyperkylemia normally only happen if one is already taking other medication or vitamins with potassium? Sorry, I'm not a huge fan of new/different medications, so just wanted to know a little about everything!

I can understand.
Some patients take diuretics for hypertension, or kidney problems, so they are advised potassium sparing diuretics.
In such patients, it is possible if you Cotrimoxazole, that you develop hyperkalemia.

Dr. Jaydeep Tripathy
Category: HIV- AIDS Specialist
MBBS from Sri Ramachandra University in December 2011
M.Med (Family Medicine) - TNMGR University, Chennai
MBA-MPH in Public Health in March 2016, SRM University
Finished AFIH in March 2016, SRM University
MRCP ( UK ), Internal Medicine, Royal College of Physicians, June 2016
Fellowship in Diabetology from Martin Luther University in January 2017

Currently Resident Physician, in MD Radiodiagnosis - Kamakshi Memorial Hospital, Chennai
Dr. Jaydeep Tripathy and 4 other Medical Specialists are ready to help you

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