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Researchers say they're close to making a non-addictive painkiller that's 50 times stronger than morphine.
It's called Blue 181 and it could be approved for use in about 5 years, according to news reports.
Researchers in Massachusetts are working on the pill.
They say it clings to a receptor that turns off pain without turning on an addictive high.
It's about to go into its first clinical trial.
