Carvedilol
Carvedilol is a beta-blocker that also blocks alpha-1 receptors, so it both slows the heart and relaxes blood vessels. The result is a lower heart rate, less force of contraction and reduced resistance in the arteries. It is used for high blood pressure and, on a doctor's supervision, for chronic heart failure.
It is taken with food, which slows absorption and reduces the light-headedness that can follow a dose. A slower pulse is expected pharmacology rather than a side effect, but it can be marked when it stacks with other heart-slowing medicines. The drug can mask the racing pulse and tremor that normally signal low blood sugar and can shift glucose readings, so glucose is worth monitoring, particularly in diabetes.
Stopping a beta-blocker abruptly can trigger rebound blood pressure and chest symptoms, so any wish to stop belongs with a doctor rather than a self-made decision. Fainting, a pulse that feels very slow, worsening breathlessness or swelling, or unexplained hypoglycaemia are reasons to see a doctor.
Reference information, not medical advice. Discuss any change with your doctor.