(1) Pharmacological effects. Phenylephrine is a powerful alpha stimulator with little or no effect on beta-receptors.
(2) Indications. Phenylephrine has a variety of uses. These include:
(a) Nasal decongestant.
(b) Vasopressor. The drug is used as a vasopressor for hypotension associated with spinal anesthesia and neurogenic shock.
(c) Mydriatic. The drug is used to produce mydriasis (dilatation of the pupil).
(3) Cautions and warnings. The drug is contraindicated in hypertension and existing ventricular tachycardia. Phenylephrine can induce cardiac irregularities.
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Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...