A, B, and C are all correct. The Aztecs believed the Spanish were fulfilling a prophecy from one of their gods (I forget which, but the god had light skin and would return from over the sea) and they welcomed them with gifts. The Spanish were carriers of small pox, which the Aztecs had no natural defense against.
My tables can be broken in half to make a 50 mg dose, which I have also used. I'd guess your 50 mg toprol xl can be split in half to give you a 25 mg tablet. I'm not suggesting what dose you should use, just saying I think you have a way to take 25 mg accurately if that's what is needed. I take the med to slow down my HR, driven by AFig.
In these studies, TOPROL-XL was administered once a day and immediate-release metoprolol was administered once to four times a day. A sixth controlled study compared the beta 1 -blocking effects of a 50 mg daily dose of the two formulations.sing an Emax model, the maximum effect is a 30% reduction in exercise heart rate, which is attributed to beta 1 -blockade. Beta1-blocking effects in the range of 30-80% of the maximal effect (approximately 8-23% reduction in exercise heart rate) correspond to metoprolol plasma concentrations from 30-540 nmol/L.