I think you need to discuss
what options you have to return to the
Cardizem CD results.
Is this a beta blocker? Metoprolol
is also a generic that is widely available and inexpensive. Calcium channel blockers can also be used to lower BP. Both of these also lower HR, which I think you don't need, but it you do well on a lower HR then anything over 40 at rest should be fine.