As a nurse, I must ensure that the patient is fully informed about the medications they are taking. Warfarin is a blood thinner, and sulfadiazine is an antibiotic. When teaching the patient about sulfadiazine, I would include the following statement: "Avoid prolonged exposure to sunlight, wear protective clothing, and apply a sunscreen to exposed skin." This is because sulfadiazine can increase sensitivity to sunlight, which can lead to sunburn and other skin damage. By following these precautions, the patient can reduce their risk of developing skin problems while taking sulfadiazine.