Thanks, that may be the reason my shift to Atenolol from Metoprolol
seemed to require a lower dose. I haven't eaten grapefruit
for a few days and it appears my side-effects from Atenolol have subsided.
I will continue to take a slightly lower dose, now at 25 mg morning 12.5 mg night, then go back to the 25 mg morning and night. As discussed in another post by me on the BB subject I was experiencing very low HR when in bed, and some serious dizziness.