Heroin and Methadone Are Cross-Tolerant.What Does This Mean

question 9

Multiple Choice

Heroin and methadone are cross-tolerant.What does this mean?

• A)They act on the same neurotransmitter receptors and, thus, a person addicted to one drug may become addicted to the other.
• B)They each produce the same level of high in users.
• C)They each produce a significantly different type and level of high in users.
• D)They do not act on the same neurotransmitter receptors; however, the level of tolerance developed will automatically cause a generalization to the other drug.

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