What causes vomiting while on Bactrim?
Patient: Hi my 9 yr. old daughter has been on bactrim for 3 days now for a bladder infection and strep throat, now before she was put on bactrim she had bugbites on her face, they started to clear up but now they look worse she also vomited twice today should I be worried? Doctor: Hello, yes Bactrim can cause vomiting. My advice would be to switch to amoxicillin which is a very good drug for both bladder infections and strep throat.  Stop the bactrim, and give ondansetron for the vomiting. Nothing to worry, she will get better soon. Hope this helped you.