reg·i·men / ˈrejəmən; ˈrezh-/ • n. 1. a prescribed course of medical treatment, way of life, or diet for the promotion or restoration of health: a regimen of one or two injections per day a treatment regimen.2. archaic a system of government.

regimen (rej-i-men) n. (in therapeutics) a prescribed systematic form of treatment, such as a diet or a course of drugs, for curing disease or improving health.