Propranolol decreases tachycardia and improves symptoms in the postural tachycardia syndrome: less is more.
Raj SR, Black BK, Biaggioni I, Paranjape SY, Ramirez M, Dupont WD, Robertson D. Propranolol decreases tachycardia and improves symptoms in the postural tachycardia syndrome: less is more. Circulation. 2009 Sep 01; 120(9):725-34.