I have been taking Cardizem cd 120mg for 19 years and and this is one of the only meds I can take for fast heart rate and blood pressure. I know this is a channel blocker but have tried beta blockers, water pills, capress patch (skin really irritated frm Patch adhesive). BUT-- the Brand Name not generic (Dilitiazem) has worked soo good for me, and pharmacys are having hard time getting it from maker Valeant. Been 3-4 months now and am 75 yrs old and sure don,t want to go through all the other try and see meds out there. What is with Valeant? that makes Cardizem Brand??