Nothing in our lives happens by chance, let alone without effort. This book represents that: focus, perseverance and dedication. From the beginning of my academic life, I was driven by my mother’s teachings to dedicate myself daily to expanding my knowledge. This work, published here, is the fruit of 18 months of hard work, study and new knowledge. It represents a correlation between the day-to-day work of my profession and the knowledge acquired and leveraged through my specialisation in Public Health Management. Medicines are classified in the health field as an important tool in the prevention, maintenance and recovery of health, so this work aimed to evaluate the evidence available in the literature on the compliance of drug prescriptions in both the public and private sectors. I would like to emphasise my thanks to my wonderful mother and magnificent wife, whose presence in my life gives me the strength to always seek personal and professional growth.