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Intralipid


Lipid emulsion or fat emulsion refers to an emulsion of lipid for human intravenous use. It is often referred to by the brand name of the most commonly used version, Intralipid, which is an emulsion of soy bean oil, egg phospholipids and glycerin, and is available in 10%, 20% and 30% concentrations. The 30% concentration is not approved for direct intravenous infusion, but should be mixed with amino acids and dextrose as part of a total nutrient admixture.


Intralipid and other balanced lipid emulsions provide essential fatty acids, linoleic acid (LA), an omega-6 fatty acid, alpha-linolenic acid (ALA), an omega-3 fatty acid. The emulsion is used as a component of intravenous nutrition for people who are unable to get nutrition via an oral diet.

Lipid emulsions are effective in treating experimental models of severe cardiotoxicity from intravenous overdose of local anaesthetic drugs such as bupivacaine.

They have been effective in people unresponsive to the usual resuscitation methods. They have subsequently been used off-label in the treatment of overdose from other fat-soluble medications.

Propofol is dissolved in a lipid emulsion for intravenous use. Sometimes etomidate (the vehicle for etomidate is propylene glycol) is supplied using a lipid emulsion as a vehicle.

Intravenous lipid emulsions have been used experimentally since at least the 19th century. An early product marketed in 1957 under the name Lipomul was briefly used in the United States but was subsequently withdrawn due to side effects. Intralipid was invented by the Swedish physician and nutrition researcher Arvid Wretlind, and was approved for clinical use in Sweden in 1962. In the United States, the Food and Drug Administration initially declined to approve the product due to prior experience with another fat emulsion. It was approved in the United States in 1972.


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