Case series: propranolol liquid in the treatment of tachyarrhythmias in neonates and infants: potential for errors.

Oral propranolol therapy is commonly used for the prevention of tachyarrhythmias in infancy and childhood. Propranolol is commercially produced in four concentrations allowing varying volumes to be administered. However, quite often an alternative strength of propranolol liquid is issued without clear change in instructions or warning. This may lead to parents inadvertently administering the wrong dose.