Prescription adherence, as it is called, is a real problem. About half of prescriptions issued each year are either not filled or the medicine is not taken correctly. (See report.) So if someone has come up with a more effective method to ensure that patients take their drugs properly, that would be good news.
Along these lines, a curious new claim has recently adorned CVS circulars that asserts that “CVS customers are better than most at staying on their prescriptions*.”

That asterisk goes to a small footnote on the front page of their advertisement.
*MOUSE PRINT:
“Based on 2019 study of national retain chain customer prescription adherence for diabetes, hypertension and hyperlipidemia medications.”
Checking the CVS website for further details, the following is displayed:

So, out of curiosity, we asked the CVS PR folks for a copy of the study, who did it and paid for it, how competitors fared, and whether the study explicitly cited the three elements above as reasons for CVS customers’ superior adherence record. The company only responded with this statement:
CVS Pharmacy worked with an independent third-party firm to study data for the top dispensed prescriptions in the U.S. across different pharmacy competitors. That data was used to create a campaign educating our customers on the benefits of filling prescriptions at CVS Pharmacy.
All this seems to say is that CVS paid for the study. We are left guessing as to which competitors did better than CVS, and which did worse. But without seeing the actual study, we simply don’t know if the conclusions that CVS drew are substantiated by it.

