Pfizer is currently running trials for an extended-release, once-a-day version of its $4 billion blockbuster Lyrica. So far, the big pharma has seen mixed results, exceeding in treating fibromyalgia but failing to reduce epileptic seizure frequency, as it attempts to expand the drug's competitiveness against not just current foes like once-daily Cymbalta, but also future cheaper generics.

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David Williamson owns shares of Pfizer. Max Macaluso and The Motley Fool have no positions in the stocks mentioned above. Try any of our Foolish newsletter services free for 30 days. We Fools don't all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.