This multiple ascending dose study assesses the safety, tolerability and pharmacokinetics of NP10679 when delivered intravenously in escalating dose levels in comparison to placebo.

NP10679 is a pH dependent inhibitor of the GluN2B subtype of the NMDA receptor. Compounds of this drug class are hypothesized to be beneficial in a number of central nervous system disorders, including brain ischemia associated with stroke, subarachnoid hemorrhage, severe pain, major depression and substance abuse disorders. This study uses a double blind, adaptive design approach to evaluate the safety, tolerability and pharmacokinetics of 5 once daily doses of NP10679 when delivered intravenously in three escalating dose levels in comparison to placebo

Inclusion Criteria:

• Male and female subjects aged 18 to 55 years
• Ability to understand the requirements of the study, provide written informed consent, abide by the study restrictions, and agree to return for the required assessments.
• If of child bearing potential (both men and women) must agree to use 2 forms of contraceptive methods for the duration of study.

Exclusion Criteria:

• Clinical laboratory values greater than or equal to 2 times the upper limit of normal.
• Recent history (within 2 yrs) or current tobacco use.