Table 1.

Sample qualitative interview content areas, questions, and probes used during the study.

Content area	Sample probes
Current adherence strategies	How long have you been prescribed a diuretic or SGLT2ia? How have you tried to remember to take your medications? What kind of barriers do you face to taking your medications on time?
DPSb technology	What are your initial reactions to the digital pill? Are there design factors to the digital pill and Reader that prevent you from wanting to use it? Why would these factors prevent your use of digital pills?
DPS messaging components	Tell me about situations you would like to receive notifications about your adherence. What kind of messages would you want to receive in relation to the digital pill?
Data privacy and sharing	The digital pill allows your provider or study team to view your adherence. What do you think of this? What concerns do you have regarding the privacy of your adherence data? Who do you think should have access to your adherence data? Why?
Acceptance of and willingness to use the DPS	Given what you know, would you be willing to use the digital pill? Why or why not?

^aSGLT2i: sodium-glucose co-transporter 2 inhibitors.

^bDPS: digital pill system.