Drug that constricts blood vessels, raising blood pressure; dilates the pupils of the eyes, and relieves nasal congestion. It is given by injection to raise blood pressure and is combined with other drugs in many nasal sprays and eyedrop preparations to relieve symptoms of allergy and the common cold (e.g., runny nose).
A drug that constricts blood vessels. It is given by injection to increase blood pressure, in a nasal spray to relieve nasal congestion, and in eye-drops to dilate the pupils. Irritation may occur when applied.
A decongestant medication employed to alleviate symptoms associated with seasonal allergic rhinitis (hay fever; see allergic rhinitis) and the ordinary cold. When utilized as eye drops, it serves to widen the pupils for eye examinations. Extended use of the nasal preparations in high doses may lead to headaches and blurred vision. Abrupt discontinuation of the drug could exacerbate nasal congestion. As such, it is not advisable to use phenylephrine for more than a week.