Table 5.

Comparison of different progestogen potencies determined experimentally with corresponding therapeutic oral doses

Progestin	Potency
	Experimental	Based on dose
Levonorgestrel	8	2–6.7 (0.15–0.5 mg)
Norethindrone	1	1 (1 mg)
MPA	0.1	0.1–0.4 (2.5–10 mg)
Dydrogesterone	0.02	0.05 (20 mg)
Progesterone	0.002	0.01–0.0033 (100–300 mg)

Potency values are relative to a value of 1 for norethindrone.