Propranolol
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"Well, I must be a really bad case.  Seems like 10-20 mg does the trick for most people.  I'm a singer/guitarist.  I took 10 mg the first time one hour before performance...didn't work.  Next time took 20 mg....didn't work.  Next time I'll try 30 mg.  I'm only 5'3", 103 pounds."