A drug, such as cocaine, which stimulates the heart but does directly inhibit the heart’s ability to relax, would be considered a:

B: Sympathomimetic drugs are stimulant compounds which mimic the effects of agonists of the sympathetic nervous system such as epinephrine (adrenaline) and norepinephrine (noradrenaline) that is, they cause the heat to best faster. A sympatholytic (or sympathoplegic) drug is a medication which inhibits the functioning of the sympathetic nervous system. The choices C & D refer to slowing down the heart.