'(3) Subject to section 13 of this Act, the Minister may exercise the Minister's power to make regulations under this section so as to secure that it is not unlawful under this Act for a practitioner who is a registered nurse, or a practitioner who is a registered nurse belonging to a class of registered nurses, for the purpose of the practitioner's profession as a registered nurse, to prescribe, administer, manufacture, compound or supply a controlled drug if the Minister, after having had regard to the nature and purpose of the controlled drug (including any deleterious effects which may arise from the misuse thereof), is satisfied that it is reasonably safe to permit the practitioner, for the purpose of the practitioner's profession as a registered nurse, to prescribe, administer, manufacture, compound or supply that controlled drug.'.".