INTRAVAGINAL USE OF 18-METHYL-15ß,16ß-METHYLENE-19-NOR-20-SPIROX-4-EN-3-ONES, INTRAVAGINAL RINGS COMPRISING 18-METHYL-15ß,16ß-METHYLENE-19-NOR-20-SPIROX-4-EN-3-ONES, AND USE THEREOF IN CONTRACEPTION

摘要

The present invention relates to intravaginal use of 18-methyl-15ß,16ß-methylene-19-nor-20-spirox-4-en-3-ones of the general formula (I), to an intravaginal ring comprising 18-methyl-15ß,16ß-methylene-19-nor-20-spirox-4-en-3-ones of the general formula (I) and its use in contraception.