Medication Anxiety - Hydroxizine

Got prescribed 25mg Hydroxizine. I’m told Hydroxizine is a powerful Benadryl.

My concern is Benadryl really tanks my BP and BPM. I’ve been given it before during outpatient procedures and staff has made comments about my BP and BPM being low while sitting down.

Anyone similar? I think I will try half a 25 and see how it goes..