The commissioner may purchase and distribute anti-toxins, serums, vaccines, immunizing agents, antibiotics and other pharmaceutical agents which the commissioner deems advisable to prevent, prepare for, or respond to an outbreak of communicable disease or other serious threat to the public health. Any medications distributed in the event of a public health incident declared pursuant to N.H. Rev. Stat. § 508:17-a shall be exempt from labeling in accordance with N.H. Rev. Stat. § 318:47-b. State employees and other persons acting under the authority and direction of the commissioner may carry out the activities authorized under this section.