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PHILADELPHIA (CBS) — For the first time, federal health regulators have given a marijuana-based drug the green light.

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On Monday, the FDA approved a medication from GW Pharmaceuticals called Epidiolex, which treats two rare forms of childhood seizures.

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The strawberry-flavored syrup contains CBD, a purified form of a chemical in the cannabis plant that does not get users high.

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TheFDA approval is a milestone that could spur more research into a drug that remains illegal under federal law.