 <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]  regularly and tell your doctor if the results are high. Vandetanib may cause a rare (possibly fatal) type of breathing problem (interstitial lung disease). Get medical help right away if you have sudden/worsening shortness of breath, cough, or fever. Vandetanib may also rarely cause a serious brain condition. Get medical help right away if you develop headaches, seizures, vision changes, confusion, or problems thinking. Get medical help right away if you have any serious side effects, including: signs of bleeding (such as bloody vomit, vomit that looks like coffee grounds, black/bloody stools), signs of a stroke (such as weakness on one side of the body, trouble speaking, sudden vision changes, confusion), sudden/severe pain in the stomach/chest/back. A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including: rash, blisters, peeling skin, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing, fever, joint pain. This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or </s>