Mo. Rev. Stat. § 338.350
The Missouri board of pharmacy may make such rules and regulations, not inconsistent with law, as may be necessary to carry out the purposes and enforce the provisions of sections 338.330 to 338.370. Such rules and regulations shall not be contrary to or more restrictive than any laws or rules pertaining to practices which are regulated by the federal Food and Drug Administration or the federal Drug Enforcement Administration when the laws or rules specifically state what requirements must be met for compliance. As used in this section, rules of the federal government shall not include guidelines or policies that may be enacted by federal agencies. No rule or portion of a rule promulgated under the authority of this chapter shall become effective unless it has been promulgated pursuant to the provisions of section 536.024.
§ 338.350, RSMo