Final answer:
A pharmacist may only engage in prescribing when they have obtained informed consent from the patient.
Step-by-step explanation:
A pharmacist may only engage in prescribing when they have obtained informed consent from the patient. This means that the patient must be fully informed about the medication being prescribed, including its benefits, risks, and potential side effects, and they must give their voluntary consent to receive the medication. Informed consent is an important ethical and legal requirement in healthcare to ensure patient autonomy and protect them from potential harm.