Please consider this case:
Jane, a 55-year old female patient of yours with diatype-2 diabetes, comes in to review her recent bloodwork. She is currently taking Metformin 500mg twice daily. Her last A1C was 7.6, and today, it is 8.1. She tells you that she hasn’t been taking her Metformin every single day – in fact, she thinks she has been missing it for the past month or so.