MTP 071Ask the Allergist: Common Allergy Problems for the InternistClinical questions to be addressed:Can I prescribe other sulfa-containing drugs to a patient who has a history of drug allergy to a sulfa-containing antibiotic?If a patient reports an allergy to penicillin, how do I know whether they can take a cephalosporin?When should I consider allergen immunotherapy in patients with asthma?How can I treat a patient with chronic urticaria, and when should I look for an underlying disease?