Norgestrel, sold under the brand name Opill among others, is a progestin which is used in birth control pills.

[5][6] Side effects of norgestrel include menstrual irregularities, headaches, nausea, and breast tenderness.

[8] The most common side effects of the norgestrel include irregular bleeding, headaches, dizziness, nausea, increased appetite, abdominal pain, cramps, or bloating.

[6] The biological activity of norgestrel lies in the levo enantiomer, levonorgestrel, whereas the dextro isomer is inactive.

[21] Norgestrel was first introduced, as a birth control pill in combination with ethinylestradiol, under the brand name Eugynon in Germany in 1966.

[2][27] The FDA granted the approval to Laboratoire HRA Pharma which was acquired by Perrigo Company plc.

[3][4][5][7] Norgestrel is marketed under a variety of brand names including Cyclacur, Cryselle, Cyclo-Progynova, Duoluton, Elinest, Eugynon, Microgynon, Lo/Ovral, Low-Ogestrel, Logynon, Microlut, Minicon, Nordette, Neogest, Opill, Ogestrel, Ovral, Ovran, Ovranette, Ovrette, Planovar, Prempak, Progyluton, and Trinordiol among others.