Is Avapro An Ace Inhibitor Or A Beta Blocker Or

Is Avapro an ace inhibitor or a beta blocker or in some other drug category? I've been taking for about 8 years and I do very well with it, I've had 2 severe outbreaks of hives, not related to food allergies, in the past 18 years and a doctor recently mentioned to me that an ace inhibitor blood pressure medicine could cause hives...