I suppose you've already checked the usuals like coursera, udacity, youtube courses etc.? "Medicine" is exteremely broad, but you can find some interesting intro courses to some of its aspects, e.g.:

https://www.coursera.org/courses?orderby=upcoming&search=medicine

Just some more general courses that sound interesting/useful:

Clinical Terminology for International and U.S. Students https://www.coursera.org/course/clinicalterminology

Understanding Research: An Overview for Health Professionals (looks extremely useful!) https://www.coursera.org/course/researchforhealth

Vital Signs: Understanding What the Body Is Telling Us https://www.coursera.org/course/vitalsigns

Clinical Problem Solving https://www.coursera.org/course/clinprobsolv

Introduction to Pharmacy https://www.coursera.org/course/intropharma

Introductory Human Physiology https://www.coursera.org/course/humanphysio

Plus many intro courses on genetics, neuropsychology etc.