Yasmin works by combining two hormones—drospirenone (a progestogen) and ethinylestradiol (an oestrogen)—which prevent the release of an egg from the ovaries. These hormones also change the cervical mucus to make it harder for sperm to enter the uterus and alter the endometrium to reduce the likelihood of implantation.

Excipients: Lactose monohydrate, maize starch, povidone K25, magnesium stearate, hypromellose, macrogol 6000, talc, titanium dioxide (E171), ferric oxide yellow (E172).

Common side effects may include nausea, headache, breast tenderness, mood changes, and changes in menstrual flow. Rare but serious risks include blood clots, stroke, and heart attack, especially in smokers over 35. Not suitable for women with a history of blood clots, certain cancers, or severe liver disease. Always read the patient information leaflet and consult a healthcare professional before starting.