Pfizer

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said the Food and Drug Administration approved Lyrica for treating fibromyalgia, one of the most common chronic, widespread pain conditions in the U.S.

Lyrica is the first medication cleared by the FDA for treating the condition. Pfizer said more than 6 million Americans have fibromyalgia.

Fibromyalgia is usually accompanied by poor sleep, stiffness and fatigue. People with the condition also report experiencing deep tenderness, soreness and flu-like aching.