In Philadelphia, some drug users are selling clean needles from needle exchange programs on the street. Researchers say the black market isn't necessarily a bad thing. ImageZoo/Corbis hide caption

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Among heroin addicts who are able to quit, 40 to 60 percent relapse within the first year — many within the first weeks of release from a treatment program. Diane Diederich/iStockphoto hide caption

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Morphine and oxycodone (the active ingredient in Oxycontin) are strong narcotic pain relievers on their own. Moxduo, a drug now up for FDA approval, would combine morphine and oxycodone in a single capsule. Rich Pedroncelli/AP hide caption

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The number of babies born with neonatal abstinence syndrome is rising in Tennessee, and lawmakers want to try a punitive approach. Katie Collins/PA Photos/Landov hide caption

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Xanax and Valium, prescribed to treat anxiety, mood disorders and insomnia, can be deadly when mixed with other sedatives. Dean812/Flickr hide caption

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Tyler BigChild, a board member of Vancouver's Drug Users Resource Center, is also part of its Brew Co-Op. The group teaches alcoholics how to make beer and wine, in the hopes that they'll stop risky behavior such as drinking rubbing alcohol. Portland Hotel Society hide caption

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As Vermont expands addiction treatment services, it is also coming to grips with one of the most difficult and emotional aspects of the problem: pregnant women addicted to opiates. iStockphoto hide caption

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Gabapentin, sold under the brand name Neurontin, helps some people cut down on drinking. iStockphoto.com hide caption

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Hydrocodone, sold as Vicodin and other brand names, may face tighter restrictions on prescribing and use. Toby Talbot/AP hide caption

itoggle caption Toby Talbot/AP