Another way for a wide pulse rate is aorta (output vessel) insufficiency caused by regurgitation, (backflow of blood into the pumping chamber rather than pumped into circulation) is significant, there can be a drop in
diastolic pressure. This regurgitant flow causes
a decrease in
the diastolic blood pressure in the aorta, and therefore an increase in the pulse pressure (systolic pressure - diastolic pressure).
There is no evidence that your medication causes a wide pulse rate.