Check with your local doctor if any side effects begin to take place or get worse. These side effects include; bloating, diarrhea, gas, headache, a change in your sex drive, lightheadedness, stomach pain, nausea, and weight changes. You may want to seek medical treatment if more serious side effects manifest themselves including, severe allergic reactions such as rash, hives, itching, shortness of breath, tightness in the chest, swelling of the mouth, face lips or tongue, adnormal bleeding from the vagina, breast lumps or breast pain, pain in the lower legs, severe headache, severe or persistent stomach ache, sudden shortness of breath or swelling, unusual vaginal discharge, vomiting, weakness or yellowing of the skin and eyes.