allergic urticaria
"Have taken Vistaril for nearly 30 years for hives that seem to be associated with exposure to hot/cold temperatures or emotional stress. A 5mg dose rapidly eliminates hives and has a lasting effect for 2-3 days. My doctor gives me an annual prescription for 30, 25mg tablets which I cut into four pieces. I only take 1/4 tablet therefore this very small dose completely resolves the hives for several days with minimal side effects consisting of slight drowsiness. For me, it is a marvelous medicine. Cost, even without insurance is extremely small."