Study Evaluating the Safety, Tolerability, Pharmacokinetics (PK), and Pharmacodynamics (PD) of SAM-315 in Healthy Adults

Inclusion criteria: * Men and women of nonchildbearing potential aged 18 to 45 years * Body mass index in the range of 18 to 30 kg/m2 and body weight ≥50 kg. * Healthy as determined by the investigator on the basis of medical history, physical examination, clinical laboratory test results, vital signs, and digital 12-lead electrocardiogram (ECG). Alanine aminotransferase (ALT), aspartate aminotransferase (AST), and creatinine levels must be within the upper limit of normal for eligibility. Exclusion criteria: * Any significant cardiovascular, hepatic, renal, respiratory, gastrointestinal, endocrine, immunologic, dermatologic, hematologic, neurologic, or psychiatric disease. * Any clinically important deviation from normal limits in physical examination, vital signs, digital 12-lead ECGs, or clinical laboratory test results. * Consumption of any caffeine-containing products (e.g., coffee, tea, chocolate, or soda) or alcoholic beverages within 48 hours and, grapefruit, grapefruit-containing products is prohibited 72 hours before study day 1.