Raynaud's phenomenon in hypertensive dialysis patients taking a sustained-release propranolol formulation

Five dialysis patients with residual hypertension were treated with a new sustained-release formulation of propranolol (160 mg per capsule) in a dosage of 1 to 2 capsules per day. Four of these patients developed persistent cold, numb, blue and clumsy fingers. The symptoms resolved when the drug was withdrawn.