I'm on Seroquel, 400 mg, and it makes me really dizzy too. I too especially notice it during the night if I have to get up. I already had low blood pressure before starting it, so I'm not sure how much of it is me being me, and what's the Seroquel. I frequently have postural hypotension - blood pressure drops and I get dizzy, when I stand up, so I just have to pause for a few seconds after waking up, to adjust.

If it continues, I'd discuss lowering your dose with your prescriber.

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