Retinoids (such as acitretin or oral isotretinoin), ovulatory stimulants (such as clomiphene), prostaglandins (such as dinoprost) plus thalidomide and lenalidomide are Schedule 4 medicines that have special risks associated with their use. Treatment may only be initiated by a medical practitioner with the appropriate qualifications and expertise. The medical practitioner must hold a warrant to prescribe the medicine, and must endorse each prescription with their warrant number.
A medical practitioner who does not hold a warrant may only prescribe these medicines when acting in accordance with the direction of the warrant holder who usually treats the patient. In this case, the prescriber must endorse the prescription with the warrant holder’s name and warrant number.