what does phenylephrine hci treat
phenylephrine-injection Index. Featured: phenylephrine hydrochloride (NeoSynephrine, Neofrin) Main Article. Phenylephrine hydrochloride injection (NeoSynephrine, Neofrin) is a prescription drug used for the maintenance of blood pressure during treatment of vascular failure in shock, drug-induced high blood pressure, and PSVT during anesthesia.