Is there any law regarding administration of IV medications?

A 37-year-old patient is admitted for leg cellulitis and the doctor has prescribed IV antibiotic for her. As the nurse is about to administer IV antibiotic for the patient, the patient refuses and claim that she fears the pain caused by IV administration, and she thinks someone from the hospital wants to poison her. what is the relevant legal stand that the nurse must consider when deciding what to do next?

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