Summary
The results are reported of the administration of dydrogesterone, 5 mg twice daily, to 49 patients with endometriosis. All but five patients were symptom‐free after nine months of therapy. Most subjective symptoms had disappeared within four to eight weeks; dyspareunia usually took longer. In 30 out of 32 patients who had a culdoscopy after one or two treatment courses, a ‘cure’ of endometriosis was confirmed. Ten out of nineteen infertile patients became pregnant following treatment. The only side‐effects were transient mastalgia and dizziness in two patients. No amenorrhoea or other disturbances of the menstrual cycle were reported.