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Switching from Beta Blocker to calcium channel blocker

Hi-I currently take metoprolol succinate er 37.5 mg per day.  I have a new cardiologist who is suggesting I go to a calcium channel blocker-cardizem- for my PACs.  Couple of questions:
1.  Isn't it dangerous to stop taking beta blockers cold turkey?
2.  Has anyone made this switch, and which one worked better for you?
3.  I also take simvastatin (Zocor) for my cholesterol as I am a Type II diabetic,  the drug interaction checkers I've seen show that cardizem and simvastatin have  amoderate drug interraction-any recommendations I could mention to my doc?

Thanks for your help!
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