Pharmaceutical policy may also attempt to shape and inform prescribing. Prescribing may be limited to physicians or include certain classes of health care providers such as nurse practitioners and pharmacists. There may be limitations placed on each class of provider. This may take the form of prescribing criteria for a drug, limiting its prescribing to a particular type of specialist physician for example (such as HIV/AIDS drugs to physicians with advanced training in this area), or it may involve special drug lists that a specific type of health care provider (such as a nurse practitioner) may prescribe from.Hattingh, Laetitia, John S. Low, and Kim Forrester. Australian pharmacy law and practice. Elsevier Health Sciences, 2013. p219
