500
This can be instilled into the nares to decrease nasal congestion.
What is phenylephrine or neosenephrine?
Most recumbent horses develop nasal edema. Airway obstruction during recovery may also be caused by problems such as laryngospasm, laryngeal hemiplegia, dorsal displacement of the soft palate, kinking of the head, or foreign bodies. Airway obstruction can lead to pulmonary edema, hemorrhage, and death.