Definition of "phenylephrine" [phenylephrine]

• An adrenergic drug, C9H13NO2, that is a powerful vasoconstrictor and is used to relieve nasal congestion, dilate the pupils, and maintain blood pressure during anesthesia. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "One study123 evaluated short-term phenylephrine therapy in hyperdynamic septic patients who were not hypotensive at the time of drug administration."
• "An ingredient called phenylephrine has replaced pseudoephedrine in many OTC medicines, but some say they don't think it works as well at clearing congestion."
• "· Use decongestant nose drops such as phenylephrine"