Progesterone-Only Pill

Short Term Contraception

The Progesterone-Only Pill (POP)

The progesterone-only pill (POP) is a form of oral contraceptive that contains progestin, a synthetic form of the hormone progesterone. This contraceptive pill is a suitable option for women who cannot take estrogen due to medical reasons. The POP primarily works by thickening the cervical mucus, which makes it difficult for sperm to reach the uterus and fertilise an egg. It also helps thin the lining of the uterus, making it less receptive to implantation.


The POP is taken orally once a day at the same time each day, without any breaks between packs. It is crucial to be consistent in taking the pill within a three-hour window to ensure its effectiveness. If the POP is taken correctly, its effectiveness in preventing pregnancy is over 99%.


In addition to its contraceptive effect, the POP offers several other benefits. It can help regulate menstrual cycles, reduce menstrual cramps, and lighten periods.

Side effects may be associated with the POP, and such can include irregular bleeding or spotting between periods, breast tenderness, headaches, and mood changes. Some women may experience a decrease in menstrual flow or the absence of periods altogether.

For individualised contraceptive guidance, contact the experienced team at The Butterfly Clinic to book an appointment.