This will be a three-site, block randomized (1:1 ratio) double-blind, placebo-controlled prospective cross-over study with 50 subjects. Patients will be randomized to receiving ziprasidone-washout-placebo or placebo- washout-ziprasidone for 13-weeks.
Primary and Secondary and safety outcomes: The primary outcome measure will be change from baseline Montgomery-Asberg Depression Rating Scale (MADRS) score to end of treatment. Safety outcomes will be determined by spontaneously reported adverse events on the case report form.
