title: In vitro and in vivo evaluation of a novel nonscrotal matrix-type transdermal delivery system of testosterone.
abstract: A matrix-type testosterone (TS) transdermal delivery system for nonscrotal skin was developed with DuroTak 87-2510 as an adhesive polymer. When 3% dodecylamine was used in combination with 10% span 80, the in vitro rat permeation rate increased from 2.29 microg/cm2/hr to 6.51 microg/cm2/ hr as the TS loading dose increased from 2% to 6%. The maximum flux of experimental patch was about 14-fold higher than that of Testoderm. Release kinetics of TS from the patches was proportional to t1/2 following the Higuchi equation, and the release rate of TS increased as TS loading dose increased. Also, a good linear relationship between the skin permeation rate and the release rate was observed, which implies that the release rate is the rate-limiting process of the skin permeation. In vivo study showed that the plasma concentration of TS promptly increased and reached the peak level within 3-6 hours of application of the experimental patch. Area under the curve (AUC0 approximately 48) and Cmax also linearly increased in a dose-dependent manner up to 6% of TS. These results demonstrate the feasibility of developing a nonscrotal matrix-type transdermal delivery system of TS.
authors.affiliation: College of Pharmacy, Pusan National University, Pusan, South Korea.
authors.forename: Hong
authors.initials: H
authors.lastname: Zhao
authors.forename: Chi-Ho
authors.initials: CH
authors.lastname: Lee
authors.forename: Suk-Jae
authors.initials: SJ
authors.lastname: Chung
authors.forename: Chang-Koo
authors.initials: CK
authors.lastname: Shim
authors.forename: Dae-Duk
authors.initials: DD
authors.lastname: Kim
mesh_terms: D000279:Administration, Cutaneous; D000588:Amines / Q000494:pharmacology; D000728:Androgens / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics; D000818:Animals; D019540:Area Under Curve; D002851:Chromatography, High Pressure Liquid; D016503:Drug Delivery Systems / Q000379:methods*; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012869:Skin Absorption / Q000187:drug effects; D013501:Surface-Active Agents / Q000494:pharmacology; D013739:Testosterone / Q000008:administration & dosage* / Q000097:blood / Q000493:pharmacokinetics
chemical_list: D000588:Amines; D000728:Androgens; D013501:Surface-Active Agents; D013739:Testosterone; C003935:dodecylamine