<qa>  What is the initial dose of study drug?Eligible subjects will be randomized in a 1:1 ratio to receive either enoximone or placebo at the Randomization Visit. The initial dose of study drug will be 25 mg t.i.d.3xday and will be administered immediately after randomization. Subjects who tolerate this initial dose will be continued on 25 mg t.i.d. for at least two weeks. After two weeks, eligible subjects will be titrated to 50 mg t.i.d. for the duration of the study. 