Allergic reaction to a specific medication. The most common cause of drug allergies is penicillin.

a group of symptoms caused by an allergic reaction to a medication

an adverse reaction to a medication, often an antibiotic, that is mediated by the body's immune system

an immunologically mediated reaction that exhibits specificity and recurrence on re-exposure to the offending drug

a rare condition in which the body's immune system responds to a drug and causes adverse health effects

a specific type of reaction involving the same immune-system cells and chemicals that cause hay fever, peanut allergy and allergic contact dermatitis

a type of harmful (adverse) reaction to a medicine

a type of harmful, or adverse, drug reaction (such as a side effect or a reaction from taking more than one type of medicine)

hypersensitivity to a drug such as anaphylaxis, cutaneous reaction.

An abnormal sensitivity to a medication, usually manifested by rash and, sometimes, fever.