I think the course is available at Institute of aviation medicine, bangalore. It basically deals with changes to the body due to various forces in an aircraft/ spacecraft.
Eg. Spatial disorientation.
Job profile would include medical fitness for pilots, airline doctor stationed at airport( pre flight alcohol tests) , safety bfriefing of the crew regarding in flight emergencies and first aid training, passenger health issues (rarely) ,You can check the syllabus as well as the thesis work of previous students at rguhs website to get an idea of what it entails.Jobs: difficult as it is mostly the government sector (Indian Air Force) that employs as well as private airlines. Few opportunities.
Hope this helps.
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