 5. Previous and concomitant treatments: use of prohibited therapies Antihistaminic agents,Theophylline, Cromolyn sodium, Corticosteroids, Decongestants, Immunotherapy, Systemic antibiotics, any cytochrome P450 3A4 inhibiting or inducing drug e.g. ritonavir, ketoconazole, itraconazole, erythromycin, cimetidine, rifampicin, St. Johns wort Hypericum perforatum etc., Tricyclic antidepressants and MAO inhibitors ; and use of any medication considered to have an influence on the outcome of the study during the EEC session, at the discretion of the Investigator andor designee. 