phenylephrine: Definition, Uses, and Clinical Overview
phenylephrine is a medication that stimulates alpha-1 adrenergic receptors. In eye care, it is most commonly used as an eye drop to enlarge the pupil and reduce surface redness. It is also used in other medical settings (such as nasal decongestion) in different formulations. In ophthalmology and optometry, phenylephrine is mainly a diagnostic and peri-procedural tool.