Diltiazem
"I began having SVT in 2011. It became debilitating with almost non-stop episodes occurring continuously throughout the day. Very frightening. At first I was prescribed Diltiazem at 120 MG. That worked for a couple of days. The SVT episodes returned, again non-stop. My dosage was increased to 180 MG per day, and that has worked for me. When my Medicare Advantage plan changed how it paid for Diltiazem, I couldn't afford that prescription. I was switched to Verapamil, which I had to take at 1/2 of a pill twice each day. It was not as effective as Diltiazem. The following year, I changed insurance plans, and was able to again take the Diltiazem 180 MG extended release capsule once per day. I don't think I have side effects."