side effects, that may go away during treatment, include nausea, vomiting, loss of appetite, diarrhea, constipation, upset stomach, gas, headache, or weight gain. if they continue or are bothersome, check with your doctor. contact your doctor immediately if you experience persistent sore throat or fever, easy bleeding/bruising, stomach pain, yellowing eyes or skin, dark urine, unusual tiredness or weakness, unusual or sudden weight gain, mental/mood changes, swelling of the hands or feet, or seizures. this medicine can cause low blood sugar (hypoglycemia). this effect may occur if you do not consume enough calories (from food, juices, fruit, etc). the symptoms include chills, cold sweat, blurred vision, dizziness, drowsiness, shaking, rapid heart rate, weakness, headache, fainting, tingling of the hands or feet, or hunger.