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Glossary · Tier 2

Drug Hypersensitivity

Also known as: drug allergy, drug allergies, medication allergy, allergic drug reaction

Verified from MedlinePlus on 06-02-2026
Quick answer

Drug hypersensitivity is the clinical term for an allergic response to a medicine. It is distinct from a drug's known pharmacological side effects and reflects an immune-mediated reaction to the substance. The U.S. National Library of Medicine definition that follows gives the baseline framing used across MedivaScan glossary entries.

MedivaScan summary. The authoritative source quote follows below.

MedlinePlus definition

Drug allergies are a group of symptoms caused by an allergic reaction to a drug (medicine).

U.S. National Library of MedicineView on source ›Verbatim quote. Last verified 06-02-2026.
For information only. MedivaScan summarizes public FDA data and is not medical advice. Consult a healthcare professional before changing any medication. If you experience a serious reaction, contact your doctor or call 911.