Table 5.

Observed Patient Medication Errors

Events for each of the eight patients who demonstrated overadherence	Detection Method
Patient took 2 extra doses gefitinib	MEMs
Patient took 5 extra doses gefitinib, also missed a dose of capecitabine, then took extra the following day	MEMs
Took extra dose gefitinib, held drug the next day	MEMs
Patient missed a dose of capecitabine, then took extra dose the next day	MEMs
Patient took multiple extra doses of gefitinib, also had 2 episodes of missing a dose of gefitinib, then taking two the following day.	Both
Patient took 3 extra days of capecitabine, took double dose gefitinib once	Diary
Patient took extra dose gefitinib in one day, held drug the next day	Diary
Patient took 1 extra dose of gefitinib	Diary

Caption: Description of the 8 different patients who demonstrated medication errors as part of adherence monitoring. Type of error is described, along with method of detection. Overall adherence rates may not reflect instances of overadherence, as ratios may have been balanced out by missed doses at other times.