Progestin-Only Pills: The Mini-Pill Explained
June 8, 2025

Description of the Method
Progestin-only pills, also known as the mini-pill, contain only progestin (no estrogen). They prevent pregnancy mainly by thickening cervical mucus and sometimes by stopping ovulation.
Effectiveness
With perfect use, the mini-pill is about 99% effective. With typical use, effectiveness is around 91% due to missed or late pills.
How to Get It
A prescription from a healthcare provider is required. Available at most pharmacies.
Side Effects
Possible side effects include irregular periods, spotting, breast tenderness, and headaches. Less risk of blood clots compared to combined pills.
Pros and Cons
Pros:
- Suitable for women who cannot take estrogen
- Can be used while breastfeeding
- Lower risk of blood clots
Cons:
- Must be taken at the same time every day
- Irregular bleeding is common
- Does not protect against STIs
Contraindications
Not recommended for women with unexplained vaginal bleeding, certain liver diseases, or a history of breast cancer.