Metoprolol works by blocking the action of a chemical called Nor-adrenaline, which is released from nerves in the heart to control its rhythm, Metoprolol also blocks another chemical called adrenaline, which is a hormone(chemical signal carried in the blood) that has similar effects to Nor-adrenaline, Metoprolol does this by stopping these chemicals from attaching (binding) to sites, called beta-receptors, in the heart so that they cant produce their effects.
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