 <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]  than the risk of side effects. Careful monitoring by your doctor may decrease your risk. This medication may raise your blood pressure. Check your blood pressure regularly and tell your doctor if the results are high. Your doctor may control your blood pressure with medication. Lenvatinib may cause low blood calcium levels. Your doctor will check lab tests during treatment, and may direct you to take calcium and vitamin D. Tell your doctor right away if you have any serious side effects, including: signs of new or worsening kidney problems (such as change in the amount of urine, frothy urine), signs of heart failure (such as shortness of breath, swelling ankles/feet, unusual tiredness, unusual/sudden weight gain), signs of an underactive thyroid (such as weight gain, cold intolerance, slow heartbeat), muscle spasms, redness/pain/swelling/blisters on the palms of your hands or soles of your feet, easy bleeding/bruising, slow wound healing. Get medical help right away if you have any very serious side effects, including: symptoms of a heart attack (such as chest/jaw/left arm pain, shortness of breath, unusual sweating), signs of a stroke (such as weakness on one side of the </s>