estradiol and levonorgestrel - Generic Medications

Climara Pro (estradiol/levonorgestrel transdermal system) is an adhesive-based matrix transdermal patch designed to release both estradiol and levonorgestrel, a progestational agent, continuously upon application to intact skin. The 22 cm 2 Climara Pro system contains 4.4 mg estradiol and 1.39 mg levonorgestrel and provides a nominal delivery rate (mg per day) of 0.045 estradiol and 0.015 levonorgestrel. Estradiol USP has a molecular weight of 272.39 and the molecular formula is C 18 H 24 O 2 . Levonorgestrel USP has a molecular weight of 312.4 and a molecular formula of C 21 H 28 O 2 . The structural formulas for estradiol and levonorgestrel are: The Climara Pro transdermal system comprises 3 layers. Proceeding from the visible surface towards the surface attached to the skin, these layers are: 1. A translucent polyethylene backing film. 2. An acrylate adhesive matrix containing estradiol and levonorgestrel. 3. A protective liner of either siliconized or fluoropolymer coated polyester film. The protective liner is attached to the adhesive surface and must be removed before the system can be used. The active components of the transdermal system are estradiol and levonorgestrel. The remaining components of the transdermal system (acrylate copolymer adhesive and polyvinylpyrrolidone/vinyl acetate copolymer) are pharmacologically inactive. Chemical structure diagram patch