medication allergy symptoms
Signs and symptoms of a drug allergy often occur within an hour after taking a drug. Less commonly, reactions can occur hours, days or weeks later. Drug allergy symptoms may include: 1  Skin rash. 2  Hives. 3  Itching. 4  Fever. 5  Swelling. 6  Shortness of breath. 7  Wheezing. 8  Runny nose.