Less Serious Side Effects mild nausea, vomiting, bloating, stomach cramps breast pain, swelling, or tenderness dizziness freckles or darkening of facial skin increased acne or hair growth changes in weight vaginal itching or discharge skin itching or rash changes in your menstrual periods, decreased sex drive; or mild headache Serious Side Effects sudden numbness or weakness, especially on one side of the body sudden headache, confusion, pain behind the eyes, problems with vision, speech, or balance pain or swelling in one or both legs migraine headache swelling in your hands or feet, rapid weight gain symptoms of depression (sleep problems, weakness, mood changes) severe pelvic pain chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling; or nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice