What causes a Drug Allergy?
A drug allergy occurs when the immune system reacts to a medication, mistakenly identifying it as a threat. Common causes include:
- Antibiotics – penicillin, sulfonamides, and cephalosporins
- Nonsteroidal anti-inflammatory drugs (NSAIDs) – ibuprofen, aspirin
- Chemotherapy drugs – platinum-based drugs, paclitaxel
- Vaccines – rare allergic responses to components
- Other medications – anticonvulsants, biologics, or contrast agents used in imaging
The reaction may be immediate or delayed, depending on the immune response and the type of drug.
What are the risk factors?
You may be more likely to develop a drug allergy if you:
- Have a personal or family history of allergies or asthma
- Have experienced previous drug reactions
- Take multiple medications at the same time
- Have other immune system disorders
- Are exposed to high doses or prolonged courses of certain drugs
