The chance of having side effects from Altavera is rare, but if you do develop them, expect them to be mild. Women may find they experience fluid retention (especially in the feet and ankles), breast tenderness, bloating, headaches, vomiting, or nausea. Most of these symptoms will disappear in about three months after your body gets used to Altavera.
Otherwise, the other big side effect to be on the lookout for is changes to your menstrual cycle. At first, you might find your periods are lighter or that you skip them entirely. This is normal, but just let your doctor know if you miss more than two periods in a row, as this could mean you're pregnant.