My daughter was prescribed Sulfatrim 200-40/5 during a ER visit where she was diagnosed with a urinary tract infection. I gave her her first dose (two teaspoons) around 6:00pm and the next morning when she woke up her eyes were blood red. She looked like she had an extreme case of pink eye, minus the itching, swelling and puss. It went away after about three days off of the meds. I will always look up any meds prior to given them to my child, even if they are prescribed by a physician.