TRENTON, N.J. (AP) — Drugmaker Pfizer Inc. said Monday that a late-stage patient study found an extended-release version of its pain drug Lyrica relieved pain better than a dummy pill in some patients, but the improvement didn’t last much longer.

The study, funded by the New York-based drugmaker, is one of three late-stage patient tests aimed at gaining approval of Lyrica for another use, as a long-term daily pill to limit pain from fibromyalgia. That’s a chronic condition, affecting more than 5 million Americans, involving bouts of widespread pain and tenderness.