A Medical Science Liaison (MSL) Pharmacist is a healthcare professional who serves as a scientific expert and bridge between pharmaceutical companies and healthcare providers. They communicate complex medical and clinical data to physicians, researchers, and key opinion leaders (KOLs) to support the safe and effective use of medications. MSL pharmacists often engage in discussions on disease states, emerging therapies, and clinical trials while ensuring compliance with regulatory guidelines. Their role is non-promotional, focusing on education, relationship-building, and scientific exchange. They typically work in specialized fields such as oncology, cardiology, or rare diseases to provide in-depth expertise.