Placebo pills are inactive pills that usually contain no hormones. In birth control packs, they’re often included to help you keep the habit of taking a pill every day and to trigger a withdrawal bleed that can look like a period.

Quick scoop

  • They don’t provide birth control hormones in the inactive week of a pack.
  • They’re commonly found in 28-day pill packs , where the last week may be placebo pills.
  • Some packs use no placebo pills at all and instead have a hormone-free break.
  • Placebos are also used in medical research as “dummy” treatments to compare against real medicines.

Important note

The bleed during placebo pills is not a true menstrual period ; it’s a withdrawal bleed caused by stopping hormones temporarily. Some placebo pills may contain iron or vitamins , but they still don’t act like active hormone pills.

If you want, I can also explain why birth control packs include them or whether you can skip placebo pills safely.