I drink a large bottle of vodka a day and take viibryd (vilazodone hydrochloride) and seroquel. is this bad?

Yes, for your health: Drinking that much vodka a day shows you're dependent on alcohol, and you also have a big tolerance. Your liver will ultimately pay the price, if other things don't kill you first. Effects on your personal life can be profound as well -- relationships, work, spiritual life, general health, etc. Drinking along with viibryd (vilazodone hydrochloride) & seroquel further worsens your outlook. Tell your doctor, please.

Depends on plan: This combination sounds like you have decided to plan your own death by taking out your liver & dying of alcohol related liver failure. To the extent that you are an adult with free will, you can make that choice and die with it.If you were actually asking if it is a rational behavior, i would have to say no. You need help & hope. I hope you can find both.