Mannitol

Mannitol is a type of sugar alcohol used as a sweetener and medication. It is used as a low calorie sweetener as it is poorly absorbed by the intestines. As a medication, it is used to decrease pressure in the eyes, as in glaucoma, and to lower increased intracranial pressure. Medically, it is given by injection or inhalation. Effects typically begin within 15 minutes and last up to 8 hours.

Mannitol
Clinical data
Trade namesOsmitrol, Bronchitol, others
Other namesd-Mannitol, mannite, manna sugar
AHFS/Drugs.comMonograph
License data
Pregnancy
category
  • AU: B2
Routes of
administration
Intravenous, By mouth
ATC code
Legal status
Legal status
Pharmacokinetic data
Bioavailability~7%
MetabolismLiver, negligible
Elimination half-life100 minutes
ExcretionKidney: 90%
Identifiers
  • D-Mannitol
    (2R,3R,4R,5R)-Hexane-1,2,3,4,5,6-hexol
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
E numberE421 (thickeners, ...)
CompTox Dashboard (EPA)
ECHA InfoCard100.000.647
Chemical and physical data
FormulaC6H14O6
Molar mass182.172 g·mol−1
3D model (JSmol)
  • O[C@H]([C@H](O)CO)[C@H](O)[C@H](O)CO
  • InChI=1S/C6H14O6/c7-1-3(9)5(11)6(12)4(10)2-8/h3-12H,1-2H2/t3-,4-,5-,6-/m1/s1 Y
  • Key:FBPFZTCFMRRESA-KVTDHHQDSA-N Y
  (verify)

Common side effects from medical use include electrolyte problems and dehydration. Other serious side effects may include worsening heart failure and kidney problems. It is unclear if use is safe in pregnancy. Mannitol is in the osmotic diuretic family of medications and works by pulling fluid from the brain and eyes.

The discovery of mannitol is attributed to Joseph Louis Proust in 1806. It is on the World Health Organization's List of Essential Medicines. It was originally made from the flowering ash and called manna due to its supposed resemblance to the Biblical food. Mannitol is on the World Anti-Doping Agency's banned drug list due to concerns that it may mask other drugs.

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