ventricular tachycardia
"I went on Dyazide for high blood pressure; it was seriously high. It was still a little bit high so the doctor put me on Dyazide. My resting heart rate was also consistently above 100, probably around 120.  Now, I have normal blood pressure and normal resting heart rate.  There were no noticeable side effects.  I am very happy with my hypertension and tachycardia medicines."