Allergic Reactions to Medication
A true allergy to a medication is different than a simple adverse reaction to the drug. The allergic reaction occurs when the immune system, having been exposed to the drug before, creates antibodies to it. On subsequent exposure to the drug these antibodies cause release of histamines. If severe, this reaction can result in a life-threatening situation known as anaphylactic shock.
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Review Date : 7/5/2002
Reviewed By : A.D.A.M. Medical Illustration Team
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