Im on 200mg of xr seroquel (quetiapine) in the morning and 200mg at night, can i take 400mg at night? because 200mg sometimes gets forgotten and makes me sleepy.

Seroquel (quetiapine) Norms: Yes. Both doses 200 mg at night and 400 mg at night would probably work just fine for you. It is very common to have too much sedation to take this during the awake hours.

Talk to your doc: On this question, i really suggest you talk with your own psychiatrist. S/he may want to adjust your doses, if you explain the issues you're having. Most doctors want to work with patients so that they get the best symptom relief, with a minimum of side effects. It's possible taking it all at night may work, but your doctor may have other reasons to divide the doses. Be well.