Hi, I had PSVT , have a normally low BP and was taking 25mg of metoprolol
2X day. When I first started it, it caused me to be photosensitive, which I found out on a trip to the tropics and had to hide from the sun!...It also made me very fatigued, lethargicand unable to focus. Others have no problem with that dose. I don't take meds usually,and am a lightweight, everyone has different metabolism, physical make up, so you will have to find what works for you.