Without looking at he clock I know it's time for my next dose when I quit feeling like I have a hangover. Nausea, vomiting, extremely thirsty, dull headache that doesn't go away, loss of appetite. I've been taking Chantix for 5 days. Definitely don't have much urge to smoke but that may be the nausea. Haven't noticed any mood swings or depression. No strange dreams. Kinda wish I had that side effect! I've tried everything for the nausea. Taken pills before, after eating or without eating. I always take with water. No difference in nausea only the amount of vomiting. If the Chantix continues to keep me from smoking (I'm down to 10 cigs a day and only smoke partials vs. over a pack a day) it will have been worth it. I'm hoping the side effects will diminish as time goes on