Both: Hives or urticaria can be the result of drug reactions, allergies, or hereditary . You should probably see a dermatologist if they persist.
Answered 10/5/2013
4.8k views
Hives: When hives are caused by a drug, the mechanism is usually an allergic reaction. We generally would consider a hive reaction to be allergy rather than side effect.
Answered 10/5/2013
4.8k views
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