It is unpredictable. I quit repeatedly with little withdrawal. (And feeling quite good went back to the bad behaviour.) Not this last time. Took myself to the ER my BP was 211/98. Yikes! Extremely dangerous. This happened on day 3. Spent night in the hospital to get the BP back down. Am on one of the benzo group of drugs and am doing much better. Going back to doc on day 6 tomorrow. And I "only" drank beer.