Drug allergies do not require allergen testing because drug allergies are allergic reactions caused after taking medications, with fairly clear causes, eliminating the need for allergen testing.

Allergens are the causes of allergic reactions. If the cause of an allergy is unclear, it is necessary to go to a hospital to check for allergens. The main focus of allergen testing includes food, pollen, etc., but this is unnecessary for medications. Commonly, skin testing can be conducted for medications to see if any allergic reactions occur. If there is an allergic reaction, the medication should not be used again. If the medication must be used, desensitization methods can be adopted to provide drug treatment.