If the commissioner of state health services has compelling evidence that an immediate danger to the public health exists as a result of the prescription of a dangerous drug by practitioners described by Section 483.001(12)(C), the commissioner may use the commissioner's existing emergency authority to limit the availability of the drug by permitting its prescription only by practitioners described by Section 483.001(12)(A), (B), or (D).
Tex. Health and Safety Code § 483.004