I'm on clozapine as well and have quite a few side effects, but nothing too serious. I'm tired 24/7 and sleep 12 hours whenever I can. I used to have the constipation but that went away over time. I do have increased sweating (esp. at night) and lots of drooling. I've gained quite a bit of weight on it too, but I've been steady weight wise for a few months now. I love how well it works though, I have been taking it as prescribed for 7 months (previously not being med compliant) and I have been stable for 7 months.