Progestogen-only pill brands: what to know

The mini pill, also called a progestogen-only pill or POP, contains a progestogen and does not contain oestrogen. Brand names are not interchangeable labels: two packs may contain different progestogens or give different instructions about when a late tablet matters. The active ingredient, strength and formulation are printed on the pack or its leaflet. Levonorgestrel is one progestogen used in contraception; the product information for a specific medicine should guide how it is taken.

Bleeding may become lighter, irregular or absent after starting a POP. This change can occur without meaning that the pill has stopped working, but missed or delayed tablets can affect protection depending on the product. Vomiting, severe diarrhoea and some medicines can also require individual advice.

Ask a pharmacist or clinician to compare the active ingredient and instructions on the old and new packs. Take the tablet at the same time each day, follow the leaflet for that exact brand, and use additional contraception if the leaflet or clinician advises it after a late or missed tablet. Do not rely on a familiar brand name if the packaging has changed. Tell the prescriber about breastfeeding, medicines for seizures or infections, and any health conditions that affect contraceptive choices.

Contact a clinician promptly if you may be pregnant, develop severe or persistent lower abdominal pain, or have bleeding that is heavy, prolonged or worrying. Seek urgent help for sudden chest pain, trouble breathing, coughing blood, or a painful swollen leg. These symptoms need assessment rather than a brand change or self-treatment.

Which active ingredient and formulation are in my pill? What should I do if I take it late, vomit or miss a dose? When would I need emergency contraception or a pregnancy test? Could any of my medicines or supplements change how it works?