I Was Recently Put On CARVEDILOL 25 MG By My

I was recently put on CARVEDILOL 25 MG by my cardiologist after the cost of Zetia skyrocketed. I was instructed to take one half tablet twice a day. Now I find myself drowsy and and unable to sit down and watch tv or drive without getting very sleepy. I had triple bypass 15 years ago and have good control of my blood pressure and cholesterol and hate to make changes that might put me at risk. Any suggestions?