Depending on your history with prescription medications, your doctor may decide to have a skin test performed, especially if the use of penicillin is being contemplated. (Skin tests for penicillin allergy are among the most accurate.)
Given that drug allergies arise only after a medication has been prescribed, communication with your doctor and medical team is essential when a drug prescription is discussed. Your drug history should be in your chart if you receive medical care at one institution or office over time, but you should be personally aware of any allergies that you have experienced in the past and speak up about them when the time is appropriate. If your medical team fails to talk about possible adverse drug events with a particular prescription, raise the subject yourself.
It is recommended that if you have a drug allergy, you wear an ID bracelet that identifies it. An allergy ID bracelet can be especially helpful in situations where an emergency room visit or acute care is necessary.