This document discusses medication adherence and strategies to improve it. It defines medication adherence as a patient conforming to a provider's recommendations regarding timing, dosage, and frequency of medication. Non-adherence is estimated to cost $100-300 billion annually and cause 125,000 deaths. The five dimensions of non-adherence are socioeconomic factors, condition-related factors, therapy-related factors, patient-related factors, and health systems factors. Strategies to improve adherence include simplifying regimens, imparting knowledge, modifying beliefs and behaviors, providing communication and trust, addressing biases, and evaluating adherence.