How long does it take for provera (medroxyprogesterone) 5mg to start working and how fast does it come out of one's system at the end of the dosage?

Provera (medroxyprogesterone): The effect of Provera (medroxyprogesterone) starts right away and builds over time. Most of the hormone is out of your system after 48 hours if taken as a pill. The injection, depopovera takes 4 months to leave the system.

Varies: If you are taking Provera (medroxyprogesterone) to bring on a period you will need to take it for about 10 days, then the period will come in 2-5 days after stopping it. If you're taking it to stop prolonged bleeding it can take a few days to many days to work. It is out of you body in a few days.