SPL Set ID: ba5a1237-4d23-441a-808e-96b97045fbe2

Scopolamine transdermal system is designed for continuous release of scopolamine following application to an area of intact skin on the head, behind the ear. Each system contains 1.3 mg of scopolamine base. Scopolamine is (9-methyl-3-oxa-9-azatricyclo [3.3.1.0 2,4 ]nonan-7-yl) 3-hydroxy-2-phenylpropanoate. The empirical formula is C 17 H 21 NO 4 and its structural formula is: Scopolamine has a molecular weight of 303.35 and a pKa of 7.55 to 7.81. The scopolamine transdermal system is a circular, 0.28 mm thick, 2.5 cm 2 film with four layers. Proceeding from the visible surface towards the surface attached to the skin, these layers are: (1) a backing membrane of tan-colored, aluminized, polyester film; (2) a drug layer of scopolamine, light mineral oil, isopropyl palmitate, crospovidone, and polyisobutylene; (3) a microporous polypropylene membrane that controls the rate of delivery of scopolamine from the system to the skin surface; and (4) a contact layer formulation of mineral oil, polyisobutylene, isopropyl palmitate, crospovidone, and scopolamine. A release liner of siliconized polyester, which covers the adhesive layer, is removed before the system is used. Cross section of the system: Chemical Structure Image