Why do you have to be careful with pt. getting allergy tested who is taking Beta Blockers?
-hold Beta Blockers for 48 to 72 hours
-You want the Beta blockers to be "open" in case the person has an allergic reaction, so you can give Epinephrine which is an Adrenergic drug that targets Alpha1, 2 and Beta 1, 2 receptors. If the pt. has blocked these receptors, the Epinephrine will not be able to impact the Alpha/Beta receptors to reverse the anaphalaxic shock