Hi, Femilon tablet contains both ethinyl estradiol and desogestrel which is used to prevent pregnancy and irregular periods. It helps to prevent release of the egg and its fertilization by the sperm. It may also help to reduce the risk of ovarian cancer. It is a safe and effective medication if it is taken according to your doctor s advice. Side effects of Femilon tablets are nausea, vomiting, headache, sweating, irregular uterine bleeding, rashes, acnes, facial hair growth, delayed wound healing, stomach cramps, stomach upset, indigestion, vaginal discharge, vaginal bleeding, dizziness, weakness, tiredness, changes in weight, loss of appetite, changes in sexual desire, breast tenderness and enlargement, fatigue, mood swings, depression, restlessness, irritability, easily bruising or bleeding, spotting or bleeding between periods, allergic reactions etc. If such side effects persist for long or if they bother you, then you should consult your doctor immediately for medical help. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician