Phenylephrine HCl Injection 2mL Vial is a potent sympathomimetic agent that primarily acts as a selective alpha-1-adrenergic receptor agonist. This pharmacological action makes it effective in constricting blood vessels, thereby increasing vascular resistance and raising blood pressure.

• Vasoconstriction: By stimulating alpha-1-adrenergic receptors, phenylephrine causes the contraction of blood vessels, which is useful in treating low blood pressure (hypotension) during surgical procedures and other settings where blood pressure support is necessary.
• Nasal Decongestant: Although primarily used intravenously in this form, phenylephrine's vasoconstrictive properties make it effective in reducing swelling in nasal passages, thereby relieving nasal congestion in other formulations.
• Ophthalmic Uses: In ophthalmology, phenylephrine is used to dilate the pupil and facilitate eye examinations or surgeries.

Phenylephrine is generally used in acute care settings due to its potent effects and quick action. It is administered intravenously under strict medical supervision to manage the patient's blood pressure effectively.