Abstract
Sildenafil is used in infants and children mainly for the treatment of pulmonary hypertension associated with congenital heart disease. Some side-effects of sildenafil are similar to the symptoms and signs of congestive heart failure in children. We present a case of a two-month-old infant with supracardiac total anomalous venous connection and pulmonary hypertension, who presented with severe sweating and tachycardia after institution of sildenafil therapy. He improved dramatically on discontinuation of the drug.