"i started out on 10mg of celexa, nothing happened. when i got to 20mg, i started feeling sick (i felt like i was going to vomit all the time) and irritated. once i got to 40mg, i began to feel impulsive and wired. i could barely sleep and i was doing risky things; even my friends said i wasn&#039;t myself! i got put on neurontin after this, i&#039;m glad i switched."