Allergy, Asthma & Immunology Before Your Visit Preparing for Your VisitPlease print and fill out the new patient questionnaire prior to your appointment. downloadNew Patient Questionnaire Medications that Interfere with Allergy TestingMany common medications, especially antihistamines, interfere with allergy skin tests. Antihistamines are in many over-the-counter medications for allergies, colds and sinus problems. It is important to stop taking these medications at least one week prior to your visit so that skin tests can be performed.If you are currently experiencing significant skin symptoms such as hives or swelling, or if you were put on antihistamines for a severe allergic reaction, do not stop your antihistamine without contacting our office first. If you have any questions about medications not on this list that could interfere with skin testing, please contact our office. Oral MedicationsCall us if you are on more than 20 mg of prednisone or 16 mg of medrol per day. DO NOT stop taking unless directed by a physician.