Epinephrine is used to treat severe reactions such as anaphylaxis. A healthcare provider can diagnose hives after examining the affected person and listening to an account of the event. Hives are not contagious. Both oral antihistamines and oral corticosteroids can have side effects, such as drowsiness, dry mouth, constipation and the inability to urinate. Antihistamines, especially the older ones such as diphenhydramine, can cause more severe reactions in the elderly.
Hives generally clear up without any long term problems.
It is important to identify the cause, however, and treat any underlying conditions. If hives occur frequently, a healthcare provider should be consulted. By visiting this site, you agree to the terms and conditions of our Visitor Agreement .