Bactrim (co-trimoxazole) can be prescribed for patients diagnosed with urinary tract infection, ear infections or infections affecting other organs. Your health care provider may recommend this medicine for a number of other conditions - and you will need to follow those recommendations to make sure you benefit from the treatment. Make sure you tell your health care provider if you have AIDS, folic acid deficiency, severe allergies, asthma, glucose-6-phosphate dehydrogenase deficiency, liver disease, malnourishment, kidney disease, or if you are pregnant or breastfeeding. Some of those conditions may prevent you from safely taking Bactrim, while other ones will require a dose adjustment to make sure you do not get any health effects. Bactrim is sometime associated with a number of side effects, such as loss of appetite, spinning sensation, joint pain, dizziness, sleep problems, vomiting, upset stomach, swollen tongue, and some other ones that can be individual. There is no need to report any of the side effects mentioned, as they tend to go away on their own. They do need to be reported if they persist or start to interfere with your everyday life.