Worth noting again: Before you consider taking any prescription medicine, confer with your doctor!
Beta blockers do help many cope with stage fright, but they are no substitute for sufficient practice--alone and with the group--and mental preparation, relaxation techniques, and all the other disciplines that comprise professional stagecraft.
That said, the anecdotal consensus seems to be that a low dose (10-40 MG, depending on body mass, individual response, etc.) take 30 minutes before the show should do the trick. The effective time frame is typically three hours.
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