Thank you for your query at AskTheDoctor.com
I understand your concern.
One single dose will not cause any harmful side effects apart from a little nausea, and abdominal pain or vomiting.
There are very contradictory studies about the use of progesterone in men. So the effects can't really be predicted, as some studies claim, progesterone in limited doses actually help male libido.
However, since you took only one pill, nothing will happen.
Hope this was helpful,
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