Therapeutical system for transdermal delivery of levonorgestrel

US6555131B1 · kind B1 · utility

Assignee

• Schwarz Pharma Ltd. · DE

Inventors

• Hans-Michael Wolff · Monheim, DE
• Christoph Arth · Düsseldorf, DE

Key dates

• Filing date: Mar 9, 2000
• Grant date: Apr 29, 2003
• Expiry date: Mar 9, 2020

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61P15/12
• WIPO field: Pharmaceuticals
• WIPO sector: Chemistry

Abstract

A stable therapeutical transdermal system for the transcutaneous delivery of levonorgestrel, alone or together with other sex steroid hormones, over a long time period is disclosed. A method of producing the transdermal system that avoids the use of solvents and avoids degradation of the steroid hormones also is disclosed.