Vilazodone, marketed as the antidepressant drug Viibryd^®, is a serotonin reuptake inhibitor for treatment of major depressive disorder. Suitable uses for this Certified Spiking Solution^® include as starting material for calibrators and controls in antidepressant testing methods by LC/MS or GC/MS for clinical toxicology, urine drug testing, or forensic analysis applications.