Question

drug tolerance is best defined as
○ a. a condition in which drug users need more of the chemical to achieve the same effects.
○ b. the pattern of symptoms a drug user experiences when he has not used the drug for some time.
○ c. the use of a drug that binds to a receptor causing an effect similar to a neurotransmitter.
○ d. the act of creating expectations of a drug effect, which influences amount of consumption.

Explanation:

Drug tolerance occurs when the body adapts to a drug, requiring higher doses to produce the same initial effect. Option a describes this accurately. Option b refers to withdrawal symptoms. Option c is about an agonist - a drug mimicking a neurotransmitter. Option d is related to placebo - like effects based on expectations.

Answer:

A. a condition in which drug users need more of the chemical to achieve the same effects.