Researchers at John Hopkins University School of Medicine in Baltimore, Md., found that the long-lasting form of the drug, known as a "depot" formulation, blocks the effect of opioid drugs, such as heroin and morphine, and prevents withdrawal symptoms for as long as six weeks.

"I believe the depot medication offers promise as a way to make effective treatment more accessible to opioid-addicted patients without the need to worry that the treatment medication itself might be misused or abused," said Dr. George E. Bigelow, lead author of the study.

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