14.2 A heroin addict has entered a rehabilitation program that requires that she take methadone. Methadone is effective in this situation because it:

A. Is an antagonist at the morphine receptors.

B. Has less potent analgesic activity than heroin.

C. Is longer acting than heroin; hence, the withdrawal is milder than with the latter drug.

D. Does not cause constipation.

E. Is nonaddictive.

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