Drug allergy is a condition that occurs when the immune system reacts negatively to a medication. This can cause a range of symptoms, from mild hives and itching to life-threatening anaphylaxis. There are several synonyms for the term "drug allergy," including medication hypersensitivity, drug hypersensitivity, drug intolerance, and drug sensitivity. While these terms are often used interchangeably, they can sometimes signal different nuances in the patient's reaction to the medication. Regardless of the terminology, it's important to seek medical attention if you suspect you have a drug allergy, as the symptoms can escalate quickly and require immediate treatment.