Used primarily in the treatment of medullary thyroid cancer, especially in cases where the cancer cannot be surgically removed or has spread to other parts of the body. It functions by inhibiting specific tyrosine kinases, including RET, VEGFR, and EGFR, which are involved in tumor growth and angiogenesis. By blocking these pathways, it helps slow down or stop the progression of the disease. It is taken orally and is often prescribed for patients with symptomatic or progressive disease. Its use requires careful monitoring due to potential side effects affecting the heart, lungs, and liver.