Double Blind, Randomized, 3 Week Inpatient Study To Evaluate The Safety & Efficacy Of PF-02545920 Compared With Placebo

A Phase 2, Multicenter, Double-blind, Randomized, Fixed Dose, Parallel Group, 3-week Inpatient Treatment Study To Evaluate The Safety, Efficacy And Pharmacokinetics Of Pf-02545920 Compared With Placebo In The Treatment Of Acute Exacerbation Of Schizophrenia

To assess the efficacy and safety of an investigational compound PF-02545920 for the treatment of schizophrenia. PF-02545920 will be more effective than placebo in reducing symptoms associated with schizophrenia.

Inclusion Criteria:

1. Have a current diagnosis of schizophrenia.
2. Increase in symptoms over the past 2-4 weeks.
3. Willing to remain inpatients for the duration of the trial.

Exclusion Criteria:

1. Evidence or history of clinically significant medical problems.
2. Females of childbearing potential.
3. A primary psychiatric diagnosis other than schizophrenia.
4. A diagnosis of substance abuse or dependence in the last 6 months.