When a person first begins drinking alcohol, two drinks produce relaxation and drowsiness. After 1 year, four drinks are needed to achieve the same relaxed, drowsy state. Why does this change occur?
a. The alcohol is less potent.
b. Tolerance develops.
c. Antagonistic effects occur.
d. Hypomagnesemia develops.
ANS: B
Tolerance refers to needing higher and higher doses of a drug to produce the desired effect. The potency of the alcohol is stable. Neither hypomagnesemia nor antagonistic effects would account for this change.
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