Classification of pharmaco-therapeutic referrals is a way of organizing drugs and treatments for certain types of illnesses. It helps doctors and pharmacists decide which drugs and treatments are the best for the patient based on their illness. For example, if someone has cancer the pharmaco-therapeutic referral system might recommend a certain type of chemotherapy or radiation therapy. The system divides different drugs and treatments into categories, making it easier for doctors and pharmacists to decide which one is the best.