<s>[INST] Hi, I was wondering how long after consumption of a food you are allergic to does it take for you to have a reaction? I had some egg by accident an hour or so ago, and I feel my throat getting tighter, I took two reactine but I was wondering if it will go away with this? [/INST] Welcome to Chat Doctor. The symptoms you described are definitely of food allergy, this time to an egg. It generally takes minutes to few hours to get symptoms of an allergy. You have taken an antihistamine Chat Doctor.  I would advise you to reach the nearest doctor and check your present status properly and get treated. I would also ask you to do an allergy profile test, to know what other food or things you are allergic to and be aware in the future. Hope my advice helped. Have a good life. </s>