(CBS News) Methadone accounts for only 2 percent of painkiller prescriptions in the United States – but the drug is behind more than 30 percent of prescription painkiller overdose deaths, the Centers for Disease Control and Prevention announced Tuesday.

Methadone is commonly known for treating withdrawal symptoms from heroin addiction, but the drug is also prescribed for pain. Health officials say most of the overdose deaths are people who take it for pain – not heroin or drug addicts.

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