Hi Hilery-
Yes...this could definitely be a side effect of Toprol XL.
Toprol is a combo of the diuretic hydrochlorothiazide and the beta blocker metoprolol
Some of the most common side effects are indeed dizziness--especially upon changing position (e.g., sitting or standing from lying down);
Also,unusual headache...
fatigue
tingling or numbness in your arms, legs, hands, or feet;
feeling thirtsy
nausea or decreased appetite;
diarrhea, constipation, gas
muscle weakness or cramps;
depression
The faintness and dizziness is more likely to be the diuretic component of the pill....
Talk to your doctor and see if he/she will entertain an alternative for you. There are many other ways to go, and most of us have chopped and changed different classes and/or dosages of meds at first, until we came up with one that didn't make us feel lousy.
Call the doc!
zuzu xx