a 24-year-old man developed high-degree atrioventricular ( a-v ) block with a pulse rate of 40 beats per minute and hypertension following an overdose of a combination decongestant cold medication that contained phenylpropanolamine , phenylephrine , chlorpheniramine , and phenyltoloxamine .
C0020538
hypertension
C0031469
phenylephrine