A drug allergy occurs when your immune system overreacts to a medication and identifies it as harmful thereby triggering a protective response.
Symptoms can consist of rash, swelling, coughing, wheezing, difficulty breathing, and even passing out or shock.
An allergy to a medication does not have to happen the first time you take it. It can occur upon re-exposure later. There are other serious reactions to drugs that are mediated by different mechanisms.
It is important to know what kind of drug allergy you have so you can manage it correctly. The allergists at Highland Park Allergy and Asthma Specialists can help determine just that.