Took lexapro (escitalopram) 20 about 7 mnths then changed to celexa 40.attempting to come completely off celexa. cut back to 20mg per gp. will this give me withdrawal?

How are you?: If you are now on the 20mg, you should be able to know within a week or two of making that change if just having cut the dose in half will cause any problems for you. Withdrawal symptoms are typically slight nausea and brief moments of light-headedness usually upon turning one's head quickly. Usually if you will have difficulty, i would expect it as you go lower on the dose.