Aripiprazole/sertraline (developmental code name ASC-01) is a combination formulation of aripiprazole (Abilify), an atypical antipsychotic, and sertraline (Zoloft), a selective serotonin reuptake inhibitor (SSRI), which was under development by Otsuka Pharmaceutical for the treatment of major depressive disorder (MDD).[1] It combines serotonin reuptake inhibition from sertraline and modulation of dopamine and serotonin receptors from aripiprazole.[2] In July 2017, it was in preregistration in Japan for the treatment of MDD. However, in September 2018, the regulatory submission in Japan for MDD was withdrawn.[3]