Yasmin affects menstrual cycles by regulating hormone levels with a combination of estrogen and drospirenone, which helps create more predictable, lighter, and less painful periods for many users. It works by suppressing ovulation and stabilizing the uterine lining, so menstrual bleeding during the pill-free or placebo days is usually shorter and more regular than natural cycles. Some women may experience spotting or breakthrough bleeding in the first few months as the body adjusts, and over time Yasmin can also reduce symptoms like premenstrual bloating, acne, and mood swings due to its anti-androgenic and mild diuretic effects.