I am an almost 54 year old female and am taking propranolol extended release 80 mg for mitral valve stenosis. I have been taking only one capsule @ morning. My dr. actually prescribed two a day but I've only been taking one because of the side effects and trying to avoid the tiredness it causes. However, I'm thinking of starting the two a day once more to help me calm down at bedtime. Any suggestions or help from any of you would be appreciated. Thanks!!!