Phenylephrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood
vessels can cause nasal congestion (stuffy nose).
Phenylephrine nasal is used to treat nasal congestion and sinus pressure caused by allergies, the
common cold, or the flu. Phenylephrine may be used to treat congestion of the tubes that drain fluid
from your inner ears, called the eustachian (yoo-STAY-shun) tubes.
Phenylephrine nasal may also be used for other purposes not listed in this medication guide.