Cooperation between an allergist and general practitioner or another physician taking care of a patient is necessary in the case of suspicion of drug hypersensitivity. Medical history should contain information required in the diagnostic process, such as a name, a form and a dose of culprit drug, clinical symptoms, dynamics of the reaction and a list of all drugs taken at the same time. A specialist on allergology should create a diagnostic procedure scheme and a safe therapy for the patient. The patient should be delivered with a comprehensive information leaflet.