For the purposes of this chapter, unless the context otherwise requires, "drug" means:
(1) Articles recognized in the official United States Pharmacopoeia, official Homeopathic Pharmacopoeia of the United States, or official National Formulary, or any supplement to any of them, unless the department shall determine that any such article is inconsistent with the provisions of this chapter or are not appropriate to conditions which exist in this state, and by regulation specifically excludes any such article;
(2) Articles intended for use, or used, in the diagnosis, cure, mitigation, treatment, or prevention of disease in man or other animals;
(3) Articles (other than food) intended to affect, or affecting, the structure or any function of the body of man or other animals; and
(4) Articles intended for use, or used, as a component of any articles specified in clauses (1), (2), or (3) of this section, but does not include mechanical devices or their components, parts, or accessories.