Prescriptions can be written by any of the following licensed professionals: MD (medical doctor), PCP (Primary Care Physician), Psychiatrist, Dentist, Doctor of Osteopathy, Physician's Assistant, Nurse Practitioner, or Naturopathic Physician. Prescriptions from Chiropractors, Optometrists, Podiatrists, and Psychologists are not acceptable unless the prescriber is also a licensed MD or DO.