The present invention relates to a low-dosed oral dosage form for treatment and/or prophylaxis of diseases, especially of endometriosis, polycystic ovary syndrome and atopic dermatitis. More particularly, the present invention concerns oral dosage forms comprising up to 120 mg N-{[17-(5-Fluoropyridin-3-yl)estra-1,3,5(10),16-tetraen-3-yl]carbonyl}-N-methyl-β-alanine per day..