Work out medication adherence rate instantly with clear inputs, formula shown and shareable results.
Divides days of medication supplied by days in the period to give the proportion of days covered, the standard adherence measure in pharmacy claims data.
Proportion of days covered
PDC (%) = days supplied / days in the measurement period x 100, capped at 100%
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
It is the level above which clinical benefit is generally maintained in cardiovascular and diabetes outcome studies.
The medication possession ratio can exceed 100% with early refills; PDC is capped and counts covered days only.