Drug therapy nonadherence rate in Canada in 2019, by therapy class

* Claimant refers to each person who submits a prescription drug claim, including all dependents who are eligible for coverage.
Therapy class refers to a grouping of medications based on their most common indication.
Adherence was calculated using the medication possession ratio (MPR), which is the sum of the days’ supply for all fills of oral medications in a particular period, divided by the number of days in the period, for any patient with three or more fills of the drug during the period. Patients with an MPR of less than 0.8 or 80% were considered nonadherent.