Final answer:
The nurse should dispose of the medication with a witness.
Step-by-step explanation:
The misuse of medication refers to the inappropriate or incorrect use of medications, which can have negative consequences for the individual's health.
When the client tells the nurse that he does not want to take the medication, the nurse should dispose of the medication with a second nurse as a witness. This is done to ensure proper accountability and prevent any potential harm or misuse of the medication.