Hives More Condition_treatment How Long Will Hives Continue After An Allergic Reaction To Medication?

How long will hives continue after an allergic reaction to medication? - hives more condition_treatment

My 6-year-old daughter had an allergic reation to penicillanic yesterday and scans all hives. I give him Benadryl every 4 hours, but when it broke up with more. Who knows how long he can continue to go with them? Or I should do something to help?