A Study To Examine The Safety, Tolerability And Pharmacokinetics Of PF-02545920 In Psychiatrically Stable Subjects With Schizophrenia

15 mg (2 mg X 2d, 5 mg X 2d, 8 mg X 3 d, then 15 mg) Q12h

15 mg (5 mg X 2d, 10 mg X 2d, then 15 mg) Q12h

15 mg (5 mg BID for 7 days 10 mg BID for 7 days, then 15 mg BID for 4 days) Q12h

Placebo Q12h