SPL Set ID: c35e019d-ec34-4e61-9400-a7ae7913e025

Erlotinib tablet, a kinase inhibitor, is a quinazolinamine with the chemical name N-(3-ethynylphenyl)-6,7-bis(2-methoxyethoxy) -4-quinazolinamine hydrochloride. Erlotinib tablet contains erlotinib as the hydrochloride salt that has the following structural formula: Erlotinib hydrochloride has the molecular formula C 22 H 23 N 3 O 4 •HCl and a molecular weight of 429.90. The molecule has a pKa of 5.35 at 25°C. Erlotinib hydrochloride is off white to pale yellow powder. It is slightly soluble in methanol and practically insoluble in acetonitrile and acetone. Aqueous solubility of erlotinib hydrochloride at 25˚C is dependent on pH with increased solubility at a pH of less than 5 due to protonation of the secondary amine. Over the pH range of 1.2 to 9.5, maximal solubility of approximately 0.15 mg/mL occurs at a pH of approximately 2. Erlotinib tablets for oral administration are available in three dosage strengths containing erlotinib hydrochloride (27.3 mg, 109.3 mg and 163.9 mg) equivalent to 25 mg, 100 mg and 150 mg erlotinib and the following inactive ingredients: colloidal silicon dioxide, crospovidone, hypromellose, lactose monohydrate, magnesium stearate, microcrystalline cellulose, polyethylene glycol, sodium lauryl sulfate, talc and titanium dioxide. Image