What should you know about the progestogen-only pill (POP)?

Depending on the formulation, progestogen thickens cervical mucus so sperm have difficulty passing through, and may prevent ovulation. It is taken at about the same time each day, with no scheduled pill-free interval. Bleeding may become lighter, less predictable, more frequent, or stop.

The POP can suit people who should avoid oestrogen, but the right choice depends on your medical history, medicines, and pregnancy plans. It does not protect against sexually transmitted infections.

Take each tablet according to the instructions supplied with your pack. If you are late or miss a tablet, follow that product's missed-pill advice because the allowed timing window varies. Use backup contraception when the instructions recommend it, and ask a pharmacist if you are unsure.

Vomiting or severe diarrhoea can interfere with absorption. Check the pack guidance, and mention other medicines or herbal products before starting because some can reduce contraceptive protection. [Levonorgestrel](/materials/levonorgestrel/) is one progestogen used in hormonal medicines; the [Combined Pill](/treatments/contraception-and-family-planning/combined-pill/) contains both oestrogen and progestogen.

Seek prompt medical advice for severe lower abdominal pain, fainting, or a positive pregnancy test while using the POP, particularly if pain or bleeding is unusual. Arrange a review for bleeding that is heavy, persistent, or difficult to manage, or for symptoms that began after a new medicine.

Ask which POP formulation fits your health history, what time window applies to your brand, and how long to use backup contraception after starting or missing tablets.