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Oh I did not make myself clear. They are available, of course, but they are rarely prescribed. Possibly it's a cost issue?I need to read the papers again. The reason I have some confidence that the conclusions are correct is that the hen is being used as a model for human disease and is the main model used for research into human ovarian cancer.
A lot of work goes in to establishing good models of human disease and this seems to be the accepted one!
I am astonished that progesterone-only contraceptives are not available in France. I mean truly astonished.
The combination pills obviously work, but the oestrogen content is where the risk is in terms of thrombosis for example. So the finding that progesterone-only pills work was a major breakthrough for women's health and what allowed many countries to feel comfortable making contraceptive pills available at the pharmacy without a prescription. I don't think anyone would say pills including oestrogen would be safe enough for over the counter use!
What's not available anymore are the so called third and fourth generation combined contraceptives, like the one I took for a decade. Containing those progestatives : Desogestrel, Gestodene, Norgestimate,
Drospirenone, Chlormadinone, Dienogest, Nomegestrol.