I was in the ER with stomach pain, nausea, hyperhydrosis. For the nausea Zofran was injected into my IV and within very few seconds my left arm turned blotchy purple and began to itch. The only drug on the list for contraindications that I take is tramadol, but I am allergic to penicillin, sulfa, aspirin. What is there in a Zofran injection that might have caused this reaction?