Polyvinyl alcohol in prescription materials of transdermal drug delivery preparations

Analysis: This group examined the composition of prescription materials of transdermal drug delivery preparations. The commonly used materials of transdermal drug delivery preparations are divided into controlled release membrane materials, skeleton materials, pressure-sensitive adhesives, backing materials, drug storehouse materials and anti-sticking materials. Ethylene-vinyl acetate copolymer is usually used as a controlled release film material. Some natural and synthetic polymer materials are often used as skeleton materials, such as hydrophilic polyvinyl alcohol and hydrophobic polysiloxane. Commonly used pressure-sensitive adhesives include polyisobutylene, polyacrylic acid and silicone rubber pressure-sensitive adhesives. Backing material: The commonly used backing material is multilayer composite aluminum foil, and other backing materials that can be used include polyethylene terephthalate, high density polyethylene, polystyrene, etc. Release materials are commonly used as polymer films, such as polyethylene, polypropylene, polystyrene and polycarbonate. The material of the drug storehouse can be a single material, or an ointment, gel or solution made of various materials, such as carbomer, hydroxypropyl methylcellulose, polyvinyl alcohol, etc. And various pressure-sensitive adhesives and skeleton materials can also be used as drug storehouse materials. Therefore, the answer to this question should be B.