In this video, Motley Fool health-care analyst David Williamson discusses the hidden winner of today's big FDA decision not to approve generic OxyContin despite a patent running out this week.

Big Pharma Pfizer sells an abuse-resistant, instant-acting version that will now avoid generic competition, but the hidden winner is the company whose technology makes the drug possible -- Acura Pharmaceuticals. This small cap popped more than 50% intraday, before settling with a 33% gain. Watch and find out what this means for investors.

David Williamson owns shares of Pfizer. Follow David on Twitter @MotleyDavid.

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