A REGIMEN is a systematic plan for therapy. It is a set of instructions or guidelines that are designed to help a person achieve a desired outcome. It typically involves a combination of diet, exercise, and lifestyle changes. Regimens are often used in medical treatments, such as cancer treatments, to help the patient manage their condition and improve their overall health. They can also be used in mental health treatments, such as cognitive behavioral therapy, to help the patient develop healthier habits and behaviors.