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In page Combined oral contraceptive pill:

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Combined oral contraceptive pills are a type of oral medication that were originally designed to be taken every day at the same time of day in order to prevent pregnancy.[1][2] There are many different formulations or brands, but the average pack is designed to be taken over a 28-day period (also known as a cycle).[citation needed] For the first 21 days of the cycle, users take a daily pill that contains two hormones, estrogen and progestogen.[citation needed] During the last 7 days of the cycle, users take daily placebo (biologically inactive) pills and these days are considered hormone-free days.[citation needed] Although these are hormone-free days, users are still protected from pregnancy during this time.