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Insulin glargine, marketed under the names Lantus, among others, is a long-acting basal insulin analogue, given once daily to help control the blood sugar level of those with diabetes. It consists of microcrystals that slowly release insulin, giving a long duration of action of 18 to 26 hours, with a "peakless" profile (according to the insulin glargine package insert). Pharmacokinetically, it resembles basal insulin secretion of non-diabetic pancreatic beta cells. Sometimes, in type 2 diabetes and in combination with a short acting sulfonylurea (drugs which stimulate the pancreas to make more insulin), it can offer moderate control of serum glucose levels. In the absence of endogenous insulin--type 1 diabetes, depleted type 2 (in some cases) or latent autoimmune diabetes of adults in late stage--insulin glargine needs the support of fast acting insulin taken with food to reduce the effect of prandially derived glucose.
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Medical uses
The long-acting insulin class, which includes insulin glargine, do not appear much better than neutral protamine Hagedorn (NPH) insulin but have a significantly greater cost making them, as of 2010, not cost effective. It is unclear if there is a difference in hypoglycemia and not enough data to determine any differences with respect to long term outcomes.
Mixing with other insulins
Unlike some other longer-acting insulins, glargine must not be diluted or mixed with other insulin or solution in the same syringe. However, this restriction has been questioned.
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Adverse effects
Cancer
As of 2012 tentative evidence shows no association between insulin glargine and cancer. Previous studies had raised concerns.
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Pharmacology
Mechanism of action
Insulin glargine has a substitution of glycine for asparagine at N21 (Asn21) and two arginines added to the carboxy terminal of B chain. The arginine amino acids shifts the isoelectric point from a pH of 5.4 to 6.7, making the molecule more soluble at an acidic pH and less soluble at physiological pH. The isoelectric shift also allows for the subcutaneous injection of a clear solution. The glycine substitution prevents deamidation of the acid-sensitive asparagine at acidic pH. In the neutral subcutaneous space, higher-order aggregates form, resulting in a slow, peakless dissolution and absorption of insulin from the site of injection. It can achieve a peakless level for at least 24 hours.
Acceptance and repartition in the body
Insulin glargine is formulated at an acidic pH 4, where it is completely water-soluble. After subcutaneous injection of the acidic solute (which can cause discomfort and a stinging sensation), when a physiologic pH (approximately 7.4) is achieved the increase in pH causes the insulin to come out of solution resulting in the formation of higher order aggregates of insulin hexamers. The higher order aggregation slows the dissociation of the hexamers into insulin monomers, the functional and physiologically active unit of insulin. This gradual process ensures that small amounts of insulin glargine are released into the body continuously, giving an almost peakless profile.
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History
The development of insulin glargine was conducted at Sanofi-Aventis's biotechnology competence center in Frankfurt-Höchst. Sanofi supplies the product to over 100 countries and more than 3,5 million patients worldwide. This makes Lantus Germany's largest and most important export pharmaceutical product. Sanofi-Aventis increased its turn-over with Lantus around 28% to 2,45 Billion EUR, therefrom 130 Million EUR in Germany, where approx. 1.8 million people with diabetes use the product. In 2007 Lantus was the 15th highest selling pharmaceutical product in Germany.
The investment in the production of Lantus and insulin-pen-manufacturing in Frankfurt-Höchst cost 700 Million EUR. In 2008 a new manufacturing plant was established for further insulin-pen manufacturing with an investment of 150 Million EUR. At Sanofi-Aventis the production of Lantus created 3000 jobs in Berlin and Frankfurt-Höchst.
On June 9, 2000 the European Commission formally approved the launching of Lantus by Sanofi-Aventis Germany Ltd. in the entire European Union. The admission was prolonged on June 9, 2005.
A three-fold more concentrated formulation, brand name Toujeo, was introduced after FDA approval in 2015.
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Patent expiry
Patent protection for insulin glargine expired in most countries in 2015. Insulin glargine from competitor Eli Lilly became available in most countries during 2015, under the brand names Basaglar (as a follow-on in the US) and Abasaglar (as a biosimilar in the EU). Biosimilar insulin glargine has only been released in 100U/mL strength to date, and biosimilar equivalents in the 300U/mL strength of Toujeo are yet to launch.
Source of the article : Wikipedia
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