Desvenlafaxine data show significant improvement in symptoms of depression in adults vs. placebo

May 25, 2006

Madison, N.J., May 25, 2006 - Wyeth Pharmaceuticals, a division of Wyeth (NYSE:WYE), this week presented for the first time phase 3 data and results from other studies concerning its investigational drug for major depressive disorder (MDD), desvenlafaxine succinate (DVS-233), a novel serotonin-norepinephrine reuptake inhibitor (SNRI) at the 2006 American Psychiatric Association Annual Meeting in Toronto.

Overall, the phase 3 data results showed desvenlafaxine succinate significantly improved depressive symptoms in adult patients compared to placebo. In a separate study investigating QTc prolongation involving healthy adult female subjects, desvenlafaxine succinate 200 mg and 600 mg doses did not affect the QT interval at the study's primary endpoint at eight hours post dose. Studying a drug's effect on the QT interval is one of many methods used to help determine a drug's overall safety profile.

Wyeth Research discovered and developed desvenlafaxine succinate. In December 2005, Wyeth submitted a New Drug Application (NDA) to the U.S. Food and Drug Administration (FDA) for desvenlafaxine succinate for the treatment of MDD.

"The phase 3 data showed that desvenlafaxine succinate can help improve symptoms in adult patients suffering with depression," says Nicholas A. DeMartinis, M.D., Assistant Professor and Associate Director of Clinical Operations of the Neuropsychopharmacology Treatment Research and Training Center at the University of Connecticut Health Center and principal investigator of the clinical trial presented in the scientific session. "Because a substantial number of patients with depression do not respond to current antidepressant treatments, it is important that new treatments continue to be developed to provide patients and physicians with additional treatment options," Dr. DeMartinis adds.

"Wyeth is pleased to be able to report these promising findings that have the potential to add value to the management and treatment of major depressive disorder," says Philip Ninan, Vice President, Neuroscience, Global Medical Affairs. "As a leader in neuroscience, Wyeth is committed to its continuing development of medications that help address the unmet needs of people living with mental illness."

Abstract: Efficacy and Safety of Desvenlafaxine Succinate in the Treatment of Major Depressive Disorder

The results of the first study presented, a phase 3, multicenter, randomized, double-blind clinical trial of desvenlafaxine succinate in 461 adult patients with MDD, showed significant reduction in Hamilton Depression Rating Scale (HAM-D17) scores for the desvenlafaxine succinate 100 mg (p = .0038) and 400 mg (p=0.0023) dose groups versus the placebo group. For the 200 mg dose group, reduction in the HAM-D17 trended towards significance (p=0.0764).

All desvenlafaxine succinate dose groups showed significant improvement on the Clinical Global Impression-Improvement (CGI-I) scale, a secondary efficacy measure, versus placebo (p< 0.05). Additionally, the 100 mg desvenlafaxine succinate group demonstrated significant improvement versus placebo in depression-related pain scores utilizing the Visual Analog Scale-Pain Intensity (VAS-PI) scale (p=0.002).

Abstract: Randomized, Double-Blind, Placebo-Controlled Study of Desvenlafaxine Succinate in Major Depressive Disorder

The results of a second phase 3, randomized, double-blind, placebo-controlled study of desvenlafaxine succinate were also presented at the APA annual meeting. In this second study, 375 adult patients with major depressive disorder were randomized to receive desvenlafaxine succinate once-daily doses of 200 mg, 400mg, or placebo. Adjusted mean change from baseline in HAM-D17 total score, the primary efficacy measure, was significantly greater for the desvenlafaxine succinate 200 mg (p=0.002) and 400 mg (p=0.008) dose groups versus placebo. In addition, overall VAS-PI scores for the desvenlafaxine succinate 200 mg group were significantly better than placebo (p=.002). There was a trend toward significance for the desvenlafaxine succinate 400 mg group (p=0.053).

In the two phase 3 desvenlafaxine succinate clinical trials presented at the APA, adverse events, including nausea and increased blood pressure, were generally consistent with the SNRI class. The incidence of nausea was greatest during week 1 of treatment and decreased dramatically afterwards to rates that remained low for the remainder of the study. The most common treatment emergent adverse events (i.e, those reported by at least 10 percent of desvenlafaxine succinate patients, and twice the rate of patients on placebo) were abdominal pain, asthenia, anorexia, constipation, dry mouth, nausea, vomiting, dizziness, insomnia, nervousness, somnolence, sweating, tremor, vertigo, and abnormal ejaculation. Most of these adverse events in both studies were mild or moderate in severity.

Abstract: Double-blind, Placebo- and Moxifloxacin-controlled Crossover Study of the Effects of Desvenlafaxine Succinate on QT Interval in Healthy Adult Female Subjects

To help determine whether desvenlafaxine succinate had effects on the QT interval, a randomized, double-blind study of 71 healthy adult women (ages 18 to 55) was conducted. In the study, desvenlafaxine succinate 200 mg and 600 mg dose groups did not affect the QT interval at the primary endpoint at eight hours post dose. Because many drugs are known to be associated with a potential to prolong QT interval, the FDA developed guidance recommending that all manufacturers conduct a QT interval study to help determine whether any new agent may potentially prolong the QT/QTc interval, one of many important measures of cardiovascular safety.

Abstract: Desvenlafaxine: Preclinical Evidence for Serotonin and Norepinephrine Reuptake Inhibition, Antidepressant, and Antinociceptive Activity

According to research also presented during the APA, desvenlafaxine succinate exhibited activity in preclinical models of depression and anxiety.
Facts About Depression
Following are facts that substantiate the significant unmet patient need for additional antidepressant treatment options and the enormous societal impact of depression.

Depression is the most common serious mental disorder worldwide. More treatment options are needed.
Depression is both a physical and mental illness.

The most common symptoms include:Wyeth Is Committed to Neuroscience Research and Development

As a leader in neuroscience, Wyeth's discovery and development of desvenlafaxine succinate demonstrates its commitment to developing pharmaceutical products to help address the unmet needs of patients living with mental illness. In addition to the investigational compound desvenlafaxine succinate for major depressive disorder, the Company also has active research programs in mental health areas, including bipolar disorder, schizophrenia, and Alzheimer's disease.

About Antidepressants
Antidepressants increased the risk of suicidal thinking and behavior (suicidality) in short-term studies in children and adolescents with MDD and other psychiatric disorders. Anyone considering the use of any antidepressant in a child or adolescent must balance the risk with the clinical need. Patients who are started on therapy should be observed closely for clinical worsening, suicidality, or unusual changes in behavior. Families and caregivers should be advised of the need for close observation and communication with the prescriber.

About Wyeth Pharmaceuticals
Wyeth Pharmaceuticals, a division of Wyeth, has leading products in the areas of women's health care, cardiovascular disease, central nervous system, inflammation, transplantation, hemophilia, oncology, vaccines and nutritional products. Wyeth is one of the world's largest research-driven pharmaceutical and health care products companies. It is a leader in the discovery, development, manufacturing, and marketing of pharmaceuticals, vaccines, biotechnology products and nonprescription medicines that improve the quality of life for people worldwide. The Company's major divisions include Wyeth Pharmaceuticals, Wyeth Consumer Healthcare and Fort Dodge Animal Health.

The statements in this press release that are not historical facts are forward-looking statements based on current expectations of future events and are subject to risks and uncertainties that could cause actual results to differ materially from those expressed or implied by such statements. These risks and uncertainties include risks associated with the inherent uncertainty of the timing and success of product research, development and commercialization (including with respect to our pipeline products), drug pricing and payment for our products by government and third party-payors, manufacturing, data generated on the safety and efficacy of our products, economic conditions including interest and currency exchange rate fluctuations, changes in generally accepted accounting principles, the impact of competitive or generic products, trade buying patterns, global business operations, product liability and other types of litigation, the impact of legislation and regulatory compliance, intellectual property rights, strategic relationships with third parties, environmental liabilities, and other risks and uncertainties, including those detailed from time to time in our periodic reports filed with the Securities and Exchange Commission, including our current reports on Form 8-K, quarterly reports on Form 10-Q and annual report on Form 10-K, particularly the discussion under the caption "Item 1A, Risk Factors." We assume no obligation to publicly update any forward-looking statements, whether as a result of new information, future developments or otherwise.

Ketchum UK

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