Beta blockers block the receptors for the physical effects of a person's natural fight or flight response. They are not sedatives, and they can't help anxiety of a purely psychological nature.
Beta receptors are found in a number of places in the body: heart, lung, arteries, brain and uterus, to name a few. Like a key in a lock, beta blockers chemically fit into beta receptors and prevent norepinephrine from binding to the receptors that cause the symptoms of the fight-or-flight response.
The degree of these effects depends on the dose and the individual's sensitivity to the medication. Peak effect occurs in one to one and a half hours. Ideally, this could allow a performer to play at his or her best, without the distraction or interference of excessive fight or flight symptoms.
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