SPL Set ID: 839fe7ae-6835-4d6a-b6b1-ca7f062caa4f

Estradiol transdermal system, USP (twice-weekly) contains estradiol in a multipolymeric adhesive. The system is designed to release estradiol continuously upon application to intact skin. Five dosage strengths of estradiol transdermal system, USP (twice-weekly) are available to provide nominal in vivo delivery rates of 0.025, 0.0375, 0.05, 0.075, or 0.1 mg of estradiol per day via the skin. Each corresponding system has an active surface area of 2.7, 4.05, 5.40, 8.1, or 10.8 cm 2 and contains 0.405, 0.608, 0.810, 1.215, or 1.620 mg of estradiol USP, respectively. The composition of the systems per unit area is identical. Estradiol USP is a white, crystalline powder, chemically described as estra-1,3,5 (10)- triene-3,17β-diol. The structural formula is: The molecular formula of estradiol is C 18 H 24 O 2 . The molecular weight is 272.39 g/mol. Estradiol transdermal system, USP (twice-weekly) is comprised of 3 layers. Proceeding from the visible surface toward the surface attached to the skin, these layers are (1) a translucent polyethylene film (2) an adhesive formulation containing estradiol, acrylic adhesive, colloidal silicon dioxide, oleic acid, povidone, propylene glycol, and silicone adhesive and (3) a fluoropolymer coated polyester release liner which is attached to the adhesive surface and must be removed before the system can be used. Estradiol transdermal systems, USP (twice-weekly) are packaged with additional piece of protective film above the system within each pouch. This piece of protective film is removed and discarded at the time of use. The active component of the system is estradiol. The remaining components of the system are pharmacologically inactive. FDA approved drug release test specifications differ from USP. structure tds-layers