Hello Thanks for writing to HCM Although many users of this medication have experienced no or minor side effects, the use of Novelon may lead to the following common side effects: weight changes, headaches, dizziness, nausea, breast tenderness and enlargement, stomach cramps, appetite changes, vomiting, and vaginal spotting. Though common, these side effects can become more serious if one or several intensify or persist. In such an event, seek immediate medical attention i advice you to continue with novelon as suggested by your doctor for effective treatment of your para ovarian cyst Discuss this with your doctor and then decide Hope this helps Take Care.