While we all experience altered states of consciousness in the form of sleep on a regular basis, some people use drugs and other substances that result in altered states of consciousness as well. This section will present brief descriptions of the effects of some of the more well-known drugs commonly used today.
This figure illustrates various drug categories and overlap among them. (credit: modification of work by Derrick Snider)
To learn more about some of the most commonly abused prescription and street drugs, check out the Commonly Abused Drugs Chart and the Commonly Abused Prescription Drugs Chart from the National Institute on Drug Abuse.