Repaglinide Teva

Intellectual property

After several attempts to file for U.S. patent protection, a filing was made in March 1990 which eventually became U.S. Patents 5,216,167 (June 1993), 5,312,924 (May 1994) and 6,143,769 (November 2000). After filing its NDA for repaglinide in 1997, Novo Nordisk applied for patent extension under the Hatch-Waxman Act. This process, called patent term restoration, allows drug patents to be extended based on the time that a drug spent in clinical trials and in the approval process. Previously it had been decided by the U.S. Patent and Trademark Office that the expiration date of U.S. Patents 5,216,167 and 5,312,924 would be 5 September 2006. In February 2001 Prandin’s patent life was extended to 14 March 2009 in response to Novo Nordisk’s patent term restoration application, with U.S. Patent 5,216,167 having been reissued as RE37035.

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Prior to the end of repaglinide’s patent term, Novo Nordisk obtained a new patent, U.S. Patent 6,677,358 (January 2004), covering the combination therapy of repaglinide together with the generic anti-diabetic drug metformin. This new patent was due to expire June 2018. In January 2011, a federal court ruled Novo Nordisk’s new patent invalid on the grounds of obviousness, and unenforceable on the grounds of inequitable conduct on the part of Novo Nordisk’s patent attorneys.

Drug interactions

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Repaglinide is a major substrate of CYP3A4 and should not be administered concomitantly with gemfibrozil, clarithromycin or azole antifungals such as itraconazole or ketoconazole. Administration of both repaglinide and one or more of these drugs results in an increase in plasma concentration of repaglinide and may lead to hypoglycemia. Co-administration of repaglinide and clopidogrel (a CYP2C8 inhibitor) may lead to a significant decrease in blood glucose levels due to a drug-drug interaction. In fact, using these drugs together for even ONE DAY can cause repaglinide levels to increase over 5-fold…and may lead to significant hypoglycemia.
Repaglinide should not be combined with sulfonylurea, because they have the same mechanism of action.

History

Precursor drugs to repaglinide were invented in late 1983 by scientists at Dr Karl Thomae GmbH, a German drug manufacturer located at Biberach an der Riß in southern Germany which was acquired by Boehringer Ingelheim in 1990. The drug that became repaglinide was later licensed by Boehringer to Novo Nordisk, which filed an Investigational New Drug application for the compound with the Food and Drug Administration (FDA) in April 1992. Novo Nordisk filed its New Drug Application (NDA) for Prandin in July 1997 and it was quickly approved, gaining FDA approval in December 1997. The drug was the first of the meglitinide class. It was branded Prandin because its quick onset and short duration of action concentrates its effect around meal time (the prandium was the Roman meal which is comparable to the modern lunch).

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Фармакокинетика

После приема внутрь репаглинид быстро абсорбируется из ЖКТ, при этом Cmax достигается через 1 ч после приема, затем уровень репаглинида в плазме быстро снижается и через 4 ч становится очень низким. Не было отмечено клинически значимых различий фармакокинетических параметров репаглинида при его приеме непосредственно перед приемом пищи, за 15 и 30 мин до еды или натощак.

Связывание с белками плазмы составляет более 90%.

Vd составляет 30 л (что согласуется с распределением в межклеточной жидкости).

Репаглинид почти полностью биотрансформируется в печени с образованием неактивных метаболитов. Репаглинид и его метаболиты выводятся преимущественно с желчью, менее 8% — с мочой (в виде метаболитов), менее 1% — с калом (в неизмененном виде). T1/2 составляет около 1 ч.

History

Precursor drugs to repaglinide were invented in late 1983 by scientists at Dr Karl Thomae GmbH, a German drug manufacturer located at in southern Germany which was acquired by in 1990. The drug that became repaglinide was later licensed by Boehringer to Novo Nordisk, which filed an application for the compound with the (FDA) in April 1992. Novo Nordisk filed its (NDA) for Prandin in July 1997 and it was quickly approved, gaining FDA approval in December 1997. The drug was the first of the meglitinide class. It was branded Prandin because its quick onset and short duration of action concentrates its effect around meal time (the was the Roman meal which is comparable to the modern lunch).

Drug interactions

Repaglinide is a major substrate of and should not be administered concomitantly with , or such as or . Administration of both repaglinide and one or more of these drugs results in an increase in plasma concentration of repaglinide and may lead to . Co-administration of repaglinide and clopidogrel (a CYP2C8 inhibitor) may lead to a significant decrease in blood glucose levels due to a drug-drug interaction. In fact, using these drugs together for even ONE DAY can cause repaglinide levels to increase over 5-fold…and may lead to significant hypoglycemia.
Repaglinide should not be combined with , because they have the same mechanism of action.

Pharmacokinetics

Absorption: repaglinide has a 56% bioavailability when absorbed from the gastrointestinal tract. Bioavailability is reduced when taken with food; the maximum concentration decreases by 20%.

Distribution: The protein binding of repalglinide to albumin is greater than 98%.

Metabolism: repaglinide is primarily metabolized by the liver — specifically CYP450 2C8 and 3A4 — and to a lesser extent via glucuronidation. Metabolites of repaglinide are inactive and do not display glucose-lowering effects.

Excretion: repaglinide is 90% excreted in the feces and 8% in the urine. 0.1% is cleared unchanged in the urine. Less than 2% is unchanged in the feces.

Intellectual property

After several attempts to file for U.S. protection, a filing was made in March 1990 which eventually became U.S. Patents 5,216,167 (June 1993), 5,312,924 (May 1994) and 6,143,769 (November 2000). After filing its NDA for repaglinide in 1997, Novo Nordisk applied for patent extension under the . This process, called patent term restoration, allows drug patents to be extended based on the time that a drug spent in clinical trials and in the approval process. Previously it had been decided by the that the expiration date of U.S. Patents 5,216,167 and 5,312,924 would be 5 September 2006. In February 2001 Prandin’s patent life was extended to 14 March 2009 in response to Novo Nordisk’s patent term restoration application, with U.S. Patent 5,216,167 having been reissued as RE37035.

Prior to the end of repaglinide’s patent term, Novo Nordisk obtained a new patent, U.S. Patent 6,677,358 (January 2004), covering the combination therapy of repaglinide together with the generic anti-diabetic drug . This new patent was due to expire June 2018. In January 2011, a federal court ruled Novo Nordisk’s new patent invalid on the grounds of obviousness, and unenforceable on the grounds of inequitable conduct on the part of Novo Nordisk’s patent attorneys.

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Pharmacokinetics

Absorption: repaglinide has a 56% bioavailability when absorbed from the gastrointestinal tract. Bioavailability is reduced when taken with food; the maximum concentration decreases by 20%.

Distribution: The protein binding of repalglinide to albumin is greater than 98%.

Metabolism: repaglinide is primarily metabolized by the liver — specifically CYP450 2C8 and 3A4 — and to a lesser extent via glucuronidation. Metabolites of repaglinide are inactive and do not display glucose-lowering effects.

Excretion: repaglinide is 90% excreted in the feces and 8% in the urine. 0.1% is cleared unchanged in the urine. Less than 2% is unchanged in the feces.

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Мужчина
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