Some side effects can include:
skin redness/irritation at the application site, nausea, vomiting, upset stomach, constipation, bloating, breast swelling and tenderness, nipple discharge, headache, back pain, joint pain, weight changes, acne, skin color changes, increased facial hair, thinning scalp hair, cold symptoms (stuffy nose, sneezing, sinus pain, sore throat), changes in your menstrual periods, break-through bleeding
More serious side effects can also include:
mental/mood changes (such as depression, memory loss), breast lumps, unusual vaginal bleeding (such as spotting, breakthrough bleeding), increased or new vaginal irritation/itching/odor/discharge, severe stomach or abdominal pain, persistent nausea or vomiting, yellowing eyes or skin, dark urine, swelling hands/ankles/feet, increased thirst or urination.
If any side effects become to severe during treatment, consult with your doctor on ways to manage these side effects. Speak with your doctor if you experience and serious effects to ensure proper and safe treatment.