I'm so sorry you had such scary experiences with tachycardia. I have had tachycardia in the past for which I consulted a cardiologist, but in my case it was likely not as a result of a medication, but more likely a combination of my mitral valve prolapse, anxiety, and often mood elevation. I have taken Seroquel XR for about 8 years now with no issues with tachycardia, thankfully, because Seroquel XR is a very beneficial medication for me. My treatment for tachycardia was begun about 13 years ago in the form of a beta blocker, which helps me beautifully. I was initially prescribed metroprolol and then later propranolol (Inderal). My current dose of propranolol is somewhat small with zero side effects that I am aware of.

Have you consulted with a cardiologist or at least a general practitioner on your tachycardia? Does your psychiatrist, cardiologist, and/or general practitioner confirm that Seroquel is in fact the culprit for your tachycardia?

I see that this is your very first post on PsychCentral, and that your username implies that your membership may only be for the purpose of scaring people about a specific medication. That concerns me, even if you can find articles to support your fears about Seroquel.

I could probably find scary articles about most medications, including non-psych meds. The truth is, some people do have unique reactions to meds, but not all. Ruling out medications based on such articles alone or rare experiences can be a pity, but I understand when people stop medications when a medication seems to clearly be a culprit of a serious side effect. I hope that you now have relief from tachycardia. If it returns while off Seroquel, I hope you do go to a general practitioner or cardiologist, if you haven't already. It's so important to rule out other causes.