- In the pre-index period, no claims for any of the cohort IMT medications, nor for any other Advair or budesonide/formoterol fixed dose combination, FSC combination medications, and may only have respiratory medication pharmacy claims for drugs included in the pre-index severity of illness assessment (Methylxanthines, Leukotriene Modifiers/Inhibitors, Omalizumab and Mast Cell Stabilizers).