- (A) Most drugs produce increased tolerance with repeated uses—the need for increasing amounts
of a drug in order to produce the same physiological effects. This tolerance gradually changes the
levels of specific neurotransmitters in the brain, so when a person stops using the drug, withdrawal
symptoms occur as the body and brain readjust and compensate for altered levels of these
neurotransmitters. The other concepts listed in the answers are not related to the tolerance-
withdrawal cause-effect cycle.
marvins-underground-k-12
(Marvins-Underground-K-12)
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