What arethethree classification of medicines for human use?

Medicines for human use can be classified into three main categories: prescription medications, over-the-counter (OTC) drugs, and controlled substances. Prescription medications require a doctor's authorization for use and are often used for specific conditions. OTC drugs can be purchased without a prescription and are typically considered safe for general use. Controlled substances are tightly regulated due to their potential for abuse and addiction, requiring special handling and prescription requirements.