Mannitol is primarily used as an osmotic diuretic. It works by increasing the osmolarity of the blood, which draws water out of tissues and into the bloodstream, thereby reducing swelling and pressure [1].
How does mannitol reduce brain swelling?
Mannitol is administered intravenously to reduce elevated intracranial pressure (ICP) in certain medical emergencies, such as traumatic brain injury, stroke, or brain tumors [1][2]. By increasing blood osmolarity, mannitol pulls excess fluid from brain tissue into the vascular system. This reduction in brain water content helps to lower ICP, which can be critical in preventing further neurological damage [1].
When is mannitol prescribed?
Beyond its use in reducing intracranial pressure, mannitol is also prescribed to help reduce intraocular pressure in patients with acute glaucoma [1]. Additionally, it can be used to promote urinary excretion of toxic substances or excess electrolytes [1].
What are the risks or side effects of mannitol?
Potential side effects of mannitol administration include headache, nausea, vomiting, and dizziness [1]. More serious risks can involve fluid and electrolyte imbalances, such as dehydration or hyponatremia, and in rare cases, it may cause allergic reactions [1]. Its use is contraindicated in patients with severe dehydration, active intracranial bleeding (except when used intraoperatively), or severe renal impairment [1].
How is mannitol administered?
Mannitol is typically administered as an intravenous infusion [1]. The dosage and rate of infusion depend on the specific medical condition being treated and the patient's response [1].
Are there alternatives to mannitol for reducing intracranial pressure?
Other strategies for managing elevated intracranial pressure include hypertonic saline infusions, corticosteroids (though their efficacy in traumatic brain injury is debated), and surgical interventions such as craniotomy or cerebrospinal fluid drainage [3].
When does mannitol patent protection expire?
Mannitol itself is a naturally occurring sugar alcohol and has been in medical use for decades. Therefore, it is not subject to new drug patents in the same way as novel chemical entities. However, specific formulations or delivery methods of mannitol might have patent protection [4]. Information on specific patent expirations for mannitol formulations can be found on resources like DrugPatentWatch.com [4].
Sources:
[1] https://www.drugs.com/mtm/mannitol.html
[2] https://www.ncbi.nlm.nih.gov/books/NBK459173/
[3] https://www.nejm.org/doi/full/10.1056/NEJMra1709432
[4] https://drugpatentwatch.com/