The nurse is preparing to administer the following medications. Which medication should the nurse question administering?  1. Cyanocobalamin (Cyanabin), vitamin B12, to a client diagnosed with...

The nurse is preparing to administer the following medications. Which medication should the nurse question administering?

 1. Cyanocobalamin (Cyanabin), vitamin B12, to a client diagnosed with end-stage chronic obstructive pulmonary disease. 2. Ferrous sulfate (Ferralyn), an iron supplement, to a client who is 22 weeks pregnant and is 2 days’ postoperative appendectomy. 3. AquaMEPHYTON (vitamin K) to a client who has an International Normalized Ratio of 4.0. 4. Calcium citrate (Citracal), a mineral, to a client who has a serum calcium level of 4.0 mEq/L.