Smoking cigarettes while using this medication increases your chance of having heart problems. Do not smoke while using this medication. The risk of heart problems increases with age (in women greater than 35 years of age) and with frequent smoking (15 cigarettes per day or greater).

Nausea, vomiting, headache, diarrhea, bleeding between menstrual periods (spotting), weight gain, acne, stomach cramps, rash, swelling or bloating, skin spots, breast tenderness, or difficulty wearing contact lenses may occur. If any of these effects persist or worsen, notify your doctor promptly. Tell your doctor immediately if any of these serious side effects occur: dizziness, flu-like symptoms (e.g., fever, cough, unusual weakness/fatigue, sore throat, muscle aches), mental/mood changes, trouble sleeping, hair loss, vaginal infections. Tell your doctor immediately if any of these unlikely but serious side effects occur: severe headache, pain in the lower legs or groin, trouble breathing, chest pain, vision changes, severe stomach pain, one-sided weakness, yellowing eyes or skin, lumps in the breast. If you notice any other effects not listed above, contact your doctor or pharmacist.

Do not share this medication with others. Keep all appointments with your doctor and the laboratory. Laboratory tests (e.g., potassium levels) may be performed to monitor for possible side effects to this medication. You should have a complete physical examination that includes blood pressure measurements and breast/pelvic examinations at regular intervals (e.g., once a year) or as directed by your doctor. Follow your doctor's instructions on how to examine your own breasts and report any lumps immediately. You should also be regularly screened for cervical cancer (e.g., Pap test).