I am currently taking 40 mg of citalopram. my psychiatrist and i have decided to cross taper me to viibryd (vilazodone hydrochloride). should i start by taking 20 mg citalopram?

?????: So you and your psychiatrist plan to cross-taper you from citalopram to Viibryd (vilazodone hydrochloride) (BTW, I commend you for knowing how to spell it), but (s)he didn't give you verbal or written instructions on how to go about it? I mean, that's what cross-tapering MEANS. I always write it out for my patients as clearly as I can. It's your MD's ethical obligation to give you unambiguous instructions on how to do it.