The present invention is concerned with a kit containing a plurality of hormone units for use in a contraceptive method which consists of two alternating consecutive phases, sometimes referred to as a sequential method or sequential regimen. More particularly the present invention relates to a kit containing a plurality of daily hormone units for use in a contraceptive method which consists of two alternating consecutive phases - an estrogenic and a progestogenic phase - of administering a sequence of said hormone units to a female of childbearing capability, the plurality of daily hormone units consisting of:

a) one or more daily hormone units, for use during the estrogenic phase, containing synthetic estrogen or a combination of synthetic estrogen and biogenic estrogen in a therapeutically effective amount to inhibit ovulation and
b) at least 10 daily hormone units, for use during the progestogenic phase, containing a combination of biogenic estrogen and progestogen in a therapeutically effective amount to inhibit ovulation and to transform the endometrium from a proliferative into a secretory state.