SPL Set ID: 8b671fc9-8cb0-4406-a9ee-7c95086d6200

Rivastigmine transdermal system contains rivastigmine, USP, a reversible cholinesterase inhibitor known chemically as (S)- 3-[1-(dimethylamino) ethyl]phenyl ethylmethylcarbamate. It has an empirical formula of C 14 H 22 N 2 O 2 as the base and a molecular weight of 250.34 g/mol (as the base). Rivastigmine, USP is a viscous, clear, and colorless to yellow to very slightly brown liquid that is sparingly soluble in water and very soluble in ethanol, acetonitrile, n-octanol and ethyl acetate. The distribution coefficient at 37°C in n-octanol/phosphate buffer solution pH 7 is 4.27. Rivastigmine transdermal system is a patch for transdermal administration. The patch is a 4-layer laminate containing the backing layer, drug matrix, adhesive matrix and overlapping release liner (see Figure 1). The release liner is removed and discarded prior to use. Figure 1: Cross Section of the Rivastigmine Transdermal System Layer 1: Backing Film Layer 2: Drug Product (Acrylic) Matrix Layer 3: Adhesive (Silicone) Matrix Layer 4: Release Liner (removed at time of use) Excipients within the formulation include acrylic copolymers, dimethicone, silicone adhesive applied to a pigmented polyethylene polyester backing, and vitamin E. chem structure figure 1