Mannitol is an osmotic diuretic used to reduce intracranial and intraocular pressure for treatment of cerebral edema, especially after head trauma.
Mannitol works by elevating blood plasma osmolality, resulting in enhanced flow of water from tissues, including the brain and cerebrospinal fluid, into interstitial fluid and plasma. It is an antiglaucoma agent and used for the promotion of diuresis before irreversible renal failure becomes established.