My 18 year old daughter had a terrible allergic reaction to omnic...

My 18 year old daughter had a terrible allergic reaction to omnicef 2 weeks ago after a 10 day regimen. Sadly, it happened 2 weeks after my nephew had an allergic reaction to the same medicine. His situation did not end so well. He was taking the medicine for strep. The allergic reaction started with hives and got worse. After some aggressive research on my brother and sister-in-law's part, my nephew was diagnosed with an allergic reaction to omnicef followed by rheumatic fever. I should have refused the omnicef for my daughter, but who knew. My daughter is 2 weeks into annoying hives that continue to pop up in different places. Her feet are swollen and we are very concerned. She has taken steroids, Kenelog cream, benadryl, as well as prescription strength antihistamines. Tomorrow she is going to see another doctor to find out what is going on. Cefdinir/omnicef is no longer welcome in our extended family.