I am on a number of psych meds, have been for years. A common routine is that if I stand up after having taken my Seroquel (1000mg) earlier I get a rapid heart rate. I have a history of tachycardia controlled with daily metoprolol, so I assume that somehow Seroquel affects my heart to allow the tachycardia. Then recently I was put on Prazosin to help with nightmares so I can hopefully get off or lower my Seroquel. This has however made my post Seroquel tachycardia and sound of my pulse in my ears dramatically worse. Anybody with ideas of what might be going on?