lamotrigine er - Medication Listings

Lamotrigine, USP an AED of the phenyltriazine class, is chemically unrelated to existing AEDs. Lamotrigine's chemical name is 3,5-diamino-6-(2,3-dichlorophenyl)-as-triazine, its molecular formula is C9H7N5Cl2, and its molecular weight is 256.09. Lamotrigine is a white to pale cream-colored powder and has a pKa of 5.7. Lamotrigine is very slightly soluble in water (0.17 mg/mL at 25°C) and slightly soluble in 0.1 M HCl (4.1 mg/mL at 25°C). The structural formula is: [Lamotrigine extended-release tablets] Lamotrigine extended-release tablets, USP are supplied for oral administration as 25 mg, 50 mg, 100 mg, 200 mg, 250 mg, and 300 mg tablets. Each tablet contains the labeled amount of lamotrigine and the following inactive ingredients: glyceryl monostearate, hypromellose, lactose monohydrate, magnesium stearate, methacrylic acid copolymer dispersion, polyethylene glycol, polysorbate 80, triethyl citrate, titanium dioxide and water. Apart from this: 25 mg tablet contains D&C yellow #10 aluminum lake, iron oxide red and iron oxide yellow. 50 mg tablet contains D&C yellow # 10 aluminum lake, FD&C blue # 2, ferric oxide yellow. 100 mg tablet contains D&C yellow # 10 aluminum lake, D&C red # 27, ferric oxide yellow. 200 mg tablet contains FD&C blue # 2 aluminum lake, ferrososferric oxide. 250 mg tablets contains carmine, FD&C blue # 2 aluminum lake, ferrososferric oxide. 300 mg tablet contains FD&C blue # 2 aluminum lake, ferric oxide yellow, ferrosoferric oxide. Lamotrigine extended-release tablets, USP contain a modified-release eroding formulation as the core. The tablets are coated with a modified enteric coating to enable a controlled release of drug in the acidic environment of the stomach. The combination of modified-release core and the modified enteric coating are designed to control the dissolution rate of lamotrigine over a period of approximately 12 to 15 hours, leading to a gradual increase in serum lamotrigine levels. FDA approved dissolution specification differs from the USP dissolution specification.

Lamotrigine, an AED of the phenyltriazine class, is chemically unrelated to existing AEDs. Lamotrigine’s chemical name is 3,5-diamino-6-(2,3-dichlorophenyl)- as-triazine, its molecular formula is C 9H 7N 5Cl 2, and its molecular weight is 256.09. Lamotrigine is a white to pale cream-colored powder and has a pK a of 5.7. Lamotrigine is very slightly soluble in water (0.17 mg/mL at 25°C) and slightly soluble in 0.1 M HCl (4.1 mg/mL at 25°C). The structural formula is: [Chemical Structure] Lamotrigine Extended-Release Tablets, USP are supplied for oral administration as 25-mg (yellow), 50-mg (green), 100-mg (orange), 200-mg (blue), 250-mg (purple), and 300-mg (gray) tablets. Each tablet contains the labeled amount of lamotrigine and the following inactive ingredients: hypromellose, lactose monohydrate, magnesium stearate, methacrylic acid and ethyl arcylate copolymer dispersion, mono- and di-glycerides, polysorbate 80, silicon dioxide(25- and 50- mg tablets only), sodium hydroxide, sodium lauryl sulfate, titanium dioxide, triethyl citrate, iron oxide black(50- and 300- mg tablets only), iron oxide red(100- and 250- mg tablets only), iron oxide yellow(25-, 50-, 100- mg tablets only), FD&C Blue No. 2 Aluminum Lake(200- and 250- mg tablets only). Tablets are printed with edible black ink (black ink is composed of ferrosoferric oxide, propylene glycol and shellac). Lamotrigine Extended-Release Tablets, USP contain a modified-release formulation as the core. The tablets are coated with a clear enteric coat to enable a controlled release of drug in the acidic environment of the stomach. The combination of this and the modified-release core are designed to control the dissolution rate of lamotrigine over a period of approximately 12 to 15 hours, leading to a gradual increase in serum lamotrigine levels. FDA approved dissolution test specifications differ from USP.