Diane 35 Tablet contains ethinylestradiol and cyproterone acetate and is commonly used in women with PCOS (polycystic ovary syndrome). Although it is often prescribed for acne and excess hair growth, it is also helpful in regulating irregular periods. In PCOS, hormonal imbalance can cause unpredictable menstrual cycles, and this medicine works by balancing hormones, reducing male hormone effects, and helping restore a more regular cycle. Even if you do not have acne or unwanted hair growth, your doctor may prescribe it mainly for cycle regulation and to protect the uterine lining from long periods without bleeding. It is generally safe when used under medical supervision, but like all hormonal medicines, it may have side effects such as nausea, breast tenderness, mood changes, or a small risk of blood clots in some women. It is important to take it exactly as advised by your doctor and attend follow-up visits to monitor your response and ensure safety.