How long does it take for citalopram to get completely out of your system upon quiting after taking 20mg daily for one year? 165lb 5'8 white male

6-8 days: You should not stop it abruptly but should gradually taper it off to be kindest to your body and brain. But to answer your question the half life of citalopram is 35 hours and it would be out of your system in approximately 6-8 days. The side effects from stopping it so suddenly however take longer than that to vanish. Talk to your provider if possible about wisest path on this.