What is "primodos"

Primodos was a hormone-based pregnancy test used in the 1960s and 1970s that consisted of two pills that contained norethisterone (as acetate) and ethinylestradiol. It detected pregnancy by inducing menstruation in women who were not pregnant. The presence or absence of menstrual bleeding was then used to determine whether the user was pregnant.

First made available for sale in the UK in 1959, it was withdrawn from sale in the UK in 1978.

Another hormonal pregnancy test called Duogynon was in use in Germany during the same general time period.