 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST]  to have your red blood cell count/hemoglobin level tested regularly to reduce the chance of this side effect. Rarely, this medication may suddenly stop working well after a period of time because your body may make antibodies to it. A very serious anemia can result. Tell your doctor right away if symptoms of anemia return (such as increased tiredness, low energy, pale skin color, shortness of breath). Tell your doctor right away if you have any serious side effects, including: symptoms of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/sudden weight gain). Get medical help right away if you have any very serious side effects, including: seizures. This medication may rarely cause serious (sometimes fatal) problems from blood clots (such as heart attack, stroke, blood clots in the legs or lungs). You may be at increased risk for blood clots if you are severely dehydrated, or have a history of blood clots, heart/blood vessel disease, heart failure, stroke, pregnant, or if you are immobile (such as on very long plane flights or being bedridden). If you use estrogen-containing products, these may also increase your risk. Before using this medication, if </s>