High Quality Content by WIKIPEDIA articles! Vilazodone (marketed as Viibryd) is an SSRI antidepressant developed by Clinical Data for the treatment of major depressive disorder. The chemical compound was originally developed by Merck KGaA (Germany). By 2009 two phase III clinical trials with positive results had been completed. Vilazodone was approved by the FDA for use in the United States to treat major depressive disorder in 10 mg, 20 mg, and 40 mg doses on January 21, 2011.