I had a brief bout of A-Fib, and the ER put me on 15mg
Diltiazem every 6 hrs. My physician a couple of days later bumped that up to 30mg/6hrs. Around a week into taking the drug, I lost most of the sense of taste; sweet, sour, salt. Initially I just had a tiny sense of "savory" as the only thing I could taste. I began to not be able to eat, because everything made me sick to my stomach. I read in the Diltiazem side-effects that this is called "taste perversion".