 Norgestrienone has been found to possess similar affinity for the progesterone receptor and androgen receptor, and in accordance, has some androgenic activity.The androgenic activity of norgestrienone is greater than that of other 19-nortestosterone derivatives due to the presence of the C9(11) double bond, which enhances said activity.The ratio of progestogenic to androgenic activity appears to be much lower for norgestrienone that it is for other 19-nortestosterone progestins such as norethisterone and levonorgestrel.