<unk> , sold under the brand name Brevibloc, is a cardioselective beta1 receptor blocker with rapid onset, a very short duration of action, and no significant intrinsic sympathomimetic or membrane stabilising activity at therapeutic dosages. It is a class II antiarrhythmic.<unk>  decreases the force and rate of heart contractions by blocking beta-adrenergic receptors of the sympathetic nervous system, which are found in the heart and other organs of the body.<unk>  prevents the action of two naturally occurring substances: epinephrine and norepinephrine. It was patented in 1980 and approved for medical use in 1987.
Esmolol
Sotalol
Nadolol
Dobutamine
Adenosine
Isoprenaline
Milrinone
Labetalol