What is a drug allergy?
A person who has a drug allergy develops allergic symptoms because the immune system over-reacts to a drug. The immune system is made up of special cells that fight infection. When the body is exposed to the drug, the cells release chemicals into the bloodstream. The chemicals cause inflammation of the skin, nose, throat, lungs or intestines.

What are the symptoms of a drug allergy?
Common symptoms of drug allergy reactions include rashes, swelling, eye redness, itching, wheezing, and diarrhea.

How does the doctor treat a drug allergy?
Treatment of a drug allergy may include epinephrine injections, antihistamines, corticosteroids, and other medications that diminish the allergic response. Allergy shots may be helpful in some individuals.