RT Book, Section A1 Trevor, Anthony J. A1 Katzung, Bertram G. A1 Kruidering-Hall, Marieke SR Print(0) ID 1123461491 T1 Drugs of Abuse T2 Katzung & Trevor's Pharmacology: Examination & Board Review, 11e YR 2015 FD 2015 PB McGraw-Hill Education PP New York, NY SN 9780071826358 LK accesspharmacy.mhmedical.com/content.aspx?aid=1123461491 RD 2021/03/07 AB Drug abuse is usually taken to mean the use of an illicit drug or the excessive or nonmedical use of a licit drug. It also denotes the deliberate use of chemicals that generally are not considered drugs by the lay public but may be harmful to the user. A primary motivation for drug abuse appears to be the anticipated feeling of pleasure derived from the CNS effects of the drug. The older term “physical (physiologic) dependence” is now generally denoted as dependence, whereas “psychological dependence” is more simply called addiction.