Psychotropic substances are chemicals that affect the mind and behavior. They can alter mood, perception, and cognitive functions, leading to changes in how a person thinks, feels, and acts. These substances include a wide range of drugs, such as antidepressants, anxiolytics, and hallucinogens, which are often used in medical settings or recreationally. These substances can be classified into different categories based on their effects. Stimulants increase alertness and energy, while depressants can relax the body and mind. Some psychotropic substances are legal and prescribed by doctors, while others are illegal and can pose significant health risks.