Omnicell is an automatic medication and supply dispensing system that helps ensure patient safety by reducing medication mistakes. It helps monitor and control medication distribution, comply with regulatory standards, and improves patient care by reducing nursing administrative time. Key features include secure controlled access, ability to automatically calculate restock levels, and data capture of all item transactions. There are policies in place for access, restocking, and handling wasted and returned medications. Potential challenges include not being able to contain all patient medications and system failures causing locked access.