The purpose of this clinical research study is to learn whether aripiprazole has effect on the steady-state pharmacokinetics of escitalopram in healthy subjects. The safety and tolerability of aripiprazole and escitalopram co-administration will also be studied.

Inclusion Criteria:

• Healthy male and female subjects, ages 18 to 45. (WOCBP) must be using an adequate method of contraception to avoid pregnancy throughout the study and for up to 4 weeks after the study in such a manner that the risk of pregnancy in minimized.
• Body Mass Index (BMI) of 18 to 33 kg/m2 inclusive.

Exclusion Criteria:

• Subjects with a decrease in SBP of >=20 mm Hg and increase in HR of >=20 bpm after 2 minutes standing vs. 2 minutes supine at screening or with frank orthostatic hypotension at screening.
• Supine BP of 90/50 mm Hg or lower at screening.