I am now 10 weeks into my champix course and considering the end. On the .5mg x 2 daily I was OK, when I increased to the 1mg x 2 daily and after about 3 days I went though 4 days of intense withdrawal - the tummy cramps, the sleepiness, intense anxiety, trance etc... so much so that I couldn't drive during this time, in fact I couldn't do anything so I basically I tried to sleep through it.... after about 3 weeks I started to feel better although still feeling high anxiety (ie. evil butterflies in my tummy).
The butterflies have now settled (by about 8 weeks in) and I feel more relaxed but I am still getting regular 'craves' throughout the days. Some of these 'craves' are very strong. I have been doing a massive amount of reading about people's experiences ending the champix course. Some end it as directed whilst others cut down. BUT a lot of those who have ended the course (either early or on time) say they have done so having been a couple weeks with no withdrawal symptoms at all.
This is the hint: if on champix and still experiencing any kind of withdrawal, think carefully before deciding to end the course....
I believe that many of the symptoms attributed to champix are withdrawal symptoms....champix does make me queasy etc.... BUT being off the ciggies is well worth it - after all, it's only a few weeks of my life compared to the future not smoking....