7. A process of manufacturing a drug delivery system comprising: mixing
predetermined quantities of a progestogen selected from the group consisting of desogestrel, 3-ketodesogestrel, and mixtures thereof with predetermined quantities of excipients and converting the mixture into dosage units each containing 70 to 80 µg of desogestrel, 3-ketodesogestrel,
or mixtures thereof and packaging 28 of said dosage units into a kit.

8. The process of claim 7 wherein said mixture is converted into dosage
units selected from the group consisting of capsules and tablets.