SPL Set ID: 9ab07d6b-ae4a-a310-5572-b266676cd29e

Lamotrigine extended-release tablets, 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 C 9 H 7 N 5 Cl 2 , and its molecular weight is 256.09. Lamotrigine USP is a white to pale cream-colored powder and has a pKa of 5.7. Lamotrigine USP is slightly soluble in acetone and in methanol. The structural formula is: Lamotrigine extended-release tablets, USP are supplied for oral administration as 25 mg (yellow), 50 mg (light green), 100 mg (orange), 200 mg (blue), 250 mg (purple) and 300 mg (grey) tablets. Each tablet contains the labeled amount of lamotrigine USP and the following inactive ingredients: D & C Red# 27 (250 mg), FD&C BLUE No. 2 (200 mg and 250 mg), hypromellose, iron oxide black (50 mg and 300 mg), iron oxide yellow (25 mg, 50 mg and 100 mg), iron oxide red (100 mg), lactose monohydrate, magnesium stearate, methacrylic acid copolymer, polyethylene glycol 400, talc, titanium dioxide and triethyl citrate. Tablets are printed with edible black ink which contains iron oxide black and shellac glaze. Lamotrigine extended-release tablets, USP contains modified release, erodible matrix as the core. The core tablet is coated with a modified enteric coat 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. Meets USP Dissolution Test 2 for Lamotrigine extended-release tablets USP, 25 mg, 50 mg, 100 mg, 200 mg and 300 mg and USP Dissolution Test is Pending for Lamotrigine extended-release tablets USP, 250 mg.