A name for a wide variety of chemical substances capable of altering the function of your mind and body in significant ways. These can include over the counterThese are drugs available at pharmacies without a prescription. Though they tend to be less powerful than illicit or prescription drugs, they can still be abused. The most commonly abused OTC substances include cough medicines, cold medicines, and motion sickness pills. More prescriptions, alcoholAn organic compound used in many products, most notably intoxicating drinks. Alcohol addiction is known as alcoholism. The first 12-step program was devised to deal with that malady. More, and controlled substances. Most drugs are either physically and/or psychologically habit-forming.