SPL Set ID: a915f81c-370a-40cf-9a60-371cdf690164

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 9 H 7 N 5 Cl 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: Lamotrigine Tablets, USP are supplied for oral administration as 25 mg (light pink), 100 mg (light pink), 150 mg (light pink), and 200 mg (light pink) tablets. Each tablet contains the labeled amount of lamotrigine and the following inactive ingredients: colloidal silicon dioxide, lactose monohydrate, magnesium stearate, povidone, sodium starch glycolate, black iron oxide, iron oxide red and yellow iron oxide. Meets USP Dissolution Test 3. 1