 <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]  sun. Avoid tanning booths and sunlamps. Use sunscreen and wear protective clothing when outdoors. Tell your doctor right away if you get sunburned or have skin blisters/redness. Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products). Older adults may be more sensitive to the side effects of this drug, especially skin changes, nausea, decreased appetite, swelling of ankles/feet/hands, and QT prolongation (see above). Tell your doctor if you are pregnant or plan to become pregnant. You should not become pregnant while using vemurafenib. Vemurafenib may harm an unborn baby. Ask about reliable forms of birth control while using this medication and for 2 weeks after the last dose. If you become pregnant, talk to your doctor right away about the risks and benefits of this medication. It is unknown if this medication passes into breast milk. Because of possible risk to the infant, breast-feeding while using this medication and for 2 weeks after stopping treatment is not recommended. Consult your doctor before breast-feeding.The interactions of Vemurafenib Oral: Drug interactions may change how your medications work or increase your risk </s>