Which of the following statements accurately describes why methadone is used to treat heroin addiction?

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Methadone,when administered in moderate or high daily doses,produces a cross-tolerance to other narcotics,thereby blocking their effects and decreasing the craving for heroin.The advantages of methadone are that it is long-acting and effective when taken orally,it does not produce a "high," it is inexpensive,and it has few known side effects.The main effect of this medication is that it decreases the craving for heroin; it is not a drug that clients come to prefer nor does it prevent further dependence on drugs.

Which of the Following Statements Accurately Describes Why Methadone Is