Those beta blockers are supposed to be real good for what you have. I don't think that one pill is going to drop your pressure, you need to have it build up in your system. Get a home blood pressure monitor, take the pill and monitor your pressure every day. If you see it getting too low call your doctor. It's not going to crash in one day, it will get lower and lower gradually. If you get a monitor you will be able to see it and not be so upset.