SPL Set ID: d28bec8f-762e-4f05-a20d-96a42970d6a7
1 drug(s) with this SPL Set ID
Estradiol Transdermal System, USP (twice-weekly) contains estradiol hemihydrate in a multipolymeric adhesive. The system is designed to release estradiol continuously upon application to intact skin. Five dosage strengths of estradiol transdermal system (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 2.5, 3.75, 5.0, 7.5, or 10.0 cm 2 and contains estradiol, USP hemihydrate equivalent to 0.41, 0.62, 0.82, 1.23, or 1.64 mg of estradiol, respectively. The composition of the systems per unit area is identical. Estradiol, USP hemihydrate is a white, crystalline powder, chemically described as Estra-1,3,5(10)-triene-3,17β-diol-hemihydrate. The structural formula is: The molecular formula of estradiol hemihydrate is C 18 H 24 O 2 • ½ H 2 O. The molecular weight is 281.39. Meets USP Drug Release Test 4. Estradiol transdermal system (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 polyolefin film printed with brown ink, (2) an adhesive formulation containing estradiol, silicone adhesive, acrylic adhesive, dipropylene glycol, povidone and oleyl alcohol, and (3) an oversized slit polyester release liner which is attached to the adhesive surface and must be removed before the system can be used. The active component of the system is estradiol. The remaining components of the system are pharmacologically inactive. Estradiol Structrual Formula Transdermal Patch Cross Section