I have low blood pressure, usually no higher than 100/60, often a bit lower. I was given an extremely small dose - but only when my systolic pressure was 100 or above. They eventually gave up on it altogether, not wanting to take any chances.
Carvedilol will lower blood pressure... if your Dad continues to respond to the dosage by fainting you should consult your doctor about lowering the dose...a slightly higher blood pressure is far better than falling and fracturing a hip.
Just for your information you can get the facts from the NIH web site on Carvedilol----- a direct quote from their web page is below.
"Carvedilol is in a class of medications called beta-blockers. It works by relaxing blood vessels and slowing heart rate to improve blood flow and decrease blood pressure"
The main effect of Carvedilol it is not to low the BP but to reduce the heart rate. Does he take other medication?
It normally takes 3-4 weeks to get used to the medication, anyway, if his body behaves like mine, days of low BP can appear at any moment .... I am on the same dose of it for more than 4 years and right now I am having days in 80/40 range, but I am in a lot of other medications.
Jesus.