Study to Evaluate Safety and Tolerability of FK949E in Patients With Major Depressive Disorder

This is a dose-titration study. In low-dose-group, patients receive prescribed dose on Day 5 after 3-step dose increases. In high-dose-group patients receive prescribed dose on Day 7 after 4-step dose increases. Patients receive prescribed dose of FK949E for 7 days in each group. The dosage period is 12 days in low dose group and 14 days in high dose group.