Briefly describe the warning words in the drug instructions.

A: According to the newly revised Regulations on the Administration of Drug Instructions and Labels, in order to ensure the safety of patients' medication, relevant "warnings" should be added to the drug instructions to remind them of the serious adverse reactions, contraindications, scope of application and potential hazards of the drug. For example, the "warning" of ceftriaxone sodium: "This product cannot be used in calcium-containing solutions such as Hartmann's and Ringer's. The combination of this product with calcium-containing preparations or calcium-containing products may lead to fatal consequences. "