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Pfizer Reports Top-Line Results From Two Lyrica® Capsules CV Phase 3b Studies

Pfizer Inc. (NYSE:PFE) announced today top-line results from two phase 3b, placebo-controlled studies with Lyrica ® (pregabalin) Capsules CV in patients with fibromyalgia (FM) and painful diabetic peripheral neuropathy (DPN), respectively. The fibromyalgia study, A0081275 met its primary endpoint, showing a reduction in pain associated with fibromyalgia in patients who were treated concurrently with antidepressant therapy for comorbid depression. Separately, the painful DPN study, A0081269 did not meet its co-primary endpoints by sufficiently reducing DPN pain and DPN pain on walking compared to placebo.

A large number of people living with fibromyalgia also suffer from depression and take antidepressant medications. The fibromyalgia study (A0081275) was a multicenter, double-blind, randomized, placebo-controlled, two-way cross-over study of Lyrica in the treatment of FM pain in patients taking concurrent antidepressant therapy for comorbid depression. The study enrolled 197 patients diagnosed with both fibromyalgia and comorbid depression who were taking a stable dose of a single antidepressant medicine (either a selective serotonin reuptake inhibitor or a serotonin–norepinephrine reuptake inhibitor) for their depression for at least three months prior to the study. In each of the two double-blind treatment periods, patients were randomized to receive Lyrica (300 or 450 mg) or placebo twice per day during a six-week treatment phase, followed by a two-week washout period, and then crossed over to the opposite treatment for an additional six weeks.

The study met its primary endpoint, showing a statistically significant greater reduction in fibromyalgia pain in patients receiving Lyrica compared to patients receiving placebo assessed by diary-based, daily pain scores. The safety profile of Lyrica was consistent with previous studies and current product labeling. The most common adverse events in this study included dizziness, somnolence and constipation.

Patients who have painful DPN can also have pain while walking. The study in patients with painful DPN who also had pain on walking (A0081269) was a multicenter, double-blind, randomized, placebo-controlled cross-over efficacy and safety study. The co-primary endpoints were DPN pain assessed by diary-based, daily pain scores and pain on walking assessed after walking 50 feet on a flat surface. The study enrolled 205 patients who were randomized to receive Lyrica (150 or 300 mg/day) or placebo during a six-week double-blind phase, followed by a two-week, washout period, and then crossed over to the opposite treatment for an additional six weeks.

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