Cefdinir
"Got prescribed Cefdinir for Strep Throat and sinus infection and ear infection. I have a penicillin allergy that cause hives and hallucinations and it shows up on day 10 of taking penicillin. My doctor is aware I have this allergy. They prescribed Cefdinir and said that I will have a 10% chance of being allergic to this as well. So I got the prescription filled and took it like I was supposed to. On day 10 I woke up and my face is swollen, and wheezing. Discontinued taking the medication.  I took some benadryl and ibuprophen and it didn't touch my reaction. I went to the doctor the next morning and they ended up giving me an Epi shot in my arm and a steroid shot in my hip and prescribed Predisone for 4 days after that. Anaphylactic reaction."