Study Evaluating the Pharmacokinetics of Venlafaxine Extended-Release (ER) and Desvenlafaxine Succinate Sustained-Release (DVS SR) 50 mg in Healthy Subjects

A Randomized, Open-Label, Two-Period, Parallel Group, Crossover Study to Evaluate the Pharmacokinetics of Venlafaxine Extended-Release and DVS SR in Healthy Subjects Who Are Extensive or Poor Cytochrome P450 2D6 Substrate Metabolizers

The purpose of this study is to determine if the relative difference in Pharmacokinetics (PK) between extensive metabolizers (EMs) and poor metabolizers (PMs) is the same with desvenlafaxine SR and venlafaxine ER when a single dose is administered.

Inclusion Criteria:

• Healthy men and women aged 18 to 55 years. Healthy as determined by the investigator on the basis of medical history and physical examination, laboratory test results, vital signs, and 12-lead electrocardiogram (ECG).
• History of being a nonsmoker for at least 1 year.
• Subjects have to be either extensive CYP2D6 metabolizers with a normal complement of 1 or 2 fully active enzyme gene alleles or poor CYP2D6 metabolizers (lack of active enzyme gene alleles) via genetic testing of a blood sample.

Exclusion Criteria:

• Presence or history of any significant cardiovascular, hepatic, renal, respiratory, gastrointestinal, endocrine, immunologic, dermatologic, hematologic, neurologic, or psychiatric disease or any severe conditions of the ears, eyes or throat (such as glaucoma or increased intraocular pressure).
• Known or suspected alcohol abuse or consumption of more than 2 standard units per day (a standard unit equals 12 ounces of beer, 1½ ounces of 80-proof alcohol, or 6 ounces of wine) within the past 6 months.
• Known or suspected current abuse of prohibited drugs or other substances. Use of any hormonal therapy within 30 days before study day -1 until the end of the partial inpatient confinement period.