Re: HCTZ and racing heart'
HCTZ could cause tachycardia if the dose were high enough to cause some dehydration. You would notice the heart rate increase mostly when upright, less so when lying or sitting. Coupled with being taken off a beta blocker recently, that could be aggravating the situation. Another choice of med for high BP (is that why you were taking these?) is a calcium channel blocker, which lowers BP and pulse rate, but works differently and doesn't cause the same side effects as beta blockers and diuretics.