Abstract
The beta-adrenergic blocking agent, propranolol, has been recommended for both immediate treatment and long-term control of cyanotic spells in children with tetralogy of Fallot.1 It has also been suggested as the second drug of choice, after digitalis, in the management of paroxysmal supraventricular tachycardia.2 The use of propranolol in children with heart disease thus is increasing. We would like to call attention to the possible occurrence of hypoglycemia during periods of restricted oral intake in children receiving propranolol. The most frequently cited side effects of propranolol are bronchospasm, bradycardia, hypotension, and congestive heart failure.3 Although not usually considered a side effect, hypoglycemia has been reported.4,5
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