NATS 1575 Lecture Notes - Lecture 7: Depressant, Methadone, Oxycodone
21 May 2017
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Document Summary
A drug- can be defined as a natural or synthetic substance that is used to produce physiological or psychological effects in humans or other higher order animals. Psychological dependence stems from conditioned use of a drug caused by emotional needs. Physical dependence is a physiological need for a drug brought about by regular use and characterized by withdrawal sickness when drug administration abruptly stops. The desire to avoid withdrawal sickness ultimately causes physical dependence or addiction. Marijuana and cocaine are common drugs of abuse whose regular use does not lead to physical dependence. Narcotics: the regular use of a narcotic drug will invariably lead to physical dependence, the most common source for these narcotic drugs is opium, extracted from poppies. Narcotic drugs- are analgesics, meaning they relieve pain by a depressing action on the central nervous system. This effects functions such as blood pressure, pulse rate and breathing rate.
