supraventricular tachycardia
"I have had SVTs for about 18 years and was switched from Calan SR to this drug.  I had no issues for about 4 years until recently when I was told that Cartia had been discontinued.  Now I am on Diltiazem for 3 months and have already had 2 episodes in a month.  I am going to try my hardest to get back on Cartia"