Furadantin and uti

My 4 year old daughter is taking furadantin for a UTI and after the first dose in the evening she did not want to eat her dinner. Later in the night she complained of stomach ache, but was able to fall asleep. By the morning she was still complaining of stomach upset and headache. She ate only two bites of her breakfast and then I gave her another dose. Twenty minutes later she began crying with terrible stomach pains.

My daughter is on it for a UTI and is awaiting a VCUG. She has had a horrible reaction with terrible red hives on her entire body. She also wakes up at night crying in pain. We had to swicth meds.