Protein Deficiency along with a beta blocker. Could this be harmful?

I'm about to begin a beta blocker for SVT (Toprol). My mom suffers from protein c & s deficiencies and had a stroke at a young age. She has recently told me that it's hereditary and that there is a strong chance me or my sister may also have it. I'm going to speak with my doctor about this on Monday but I'm wondering if they could be bad when combined (a beta blocker and a protein deficiency).