abstract |
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. |