Hello, Novelon is an oral contraceptive pill that contains a combination of two hormones, ethinyl estradiol and desogestrel. While mood swings are not a common side effect of this medication, they can occur in some individuals. The hormones in Novelon can affect the levels of neurotransmitters in the brain, such as serotonin and dopamine, which can in turn impact mood. Some women may experience mood changes, such as depression, anxiety, or irritability, when taking hormonal birth control. If you are experiencing mood swings while taking Novelon, it is important to talk to your healthcare provider. They may be able to suggest strategies to help manage your symptoms, such as lifestyle changes, therapy, or medication adjustments. In some cases, a different type of birth control may be recommended. It is important to continue taking your medication as directed while discussing any concerns or side effects with your healthcare provider. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Shah Hussain, General & Family Physician