What is drug abuse and drug addiction?

Drug abuse, also known as substance abuse, involves the repeated and excessive use of chemical substances to achieve a certain effect. These substances may be “street” or “illicit” drugs, illegal due to their high potential for addiction and abuse. They also may be drugs obtained with a prescription, used for pleasure rather than for medical reasons.
Different drugs have different effects. Some, such as cocaine or methamphetamine, may produce an intense “rush” and initial feelings of boundless energy. Others, such as heroin, benzodiazepines or the prescription oxycontin, may produce excessive feelings of relaxation and calm. What most drugs have in common, though, is overstimulation of the pleasure center of the brain. With time, the brain’s chemistry is actually altered to the point where not having the drug becomes extremely uncomfortable and even painful. This compelling urge to use, addiction, becomes more and more powerful, disrupting work, relationships, and health.
Prescription drug abuse
Prescription drug abuse is just as dangerous as street drug use. When used appropriately, prescription drugs can have beneficial effects medically or psychologically. Prescription drugs in the opiate family, such as vicodin (hydrocodone) and oxycontin, are often prescribed for chronic pain or recovery from surgery. Benzodiazapines, such as valium or Xanax, are prescribed to treat anxiety. The problem arises when these drugs begin to be used ‘off label’. Furthermore, prescription drugs provide an easy access point to other family members susceptible to abuse.