Certainly, a person with license (irrespective of the type of physician's license) should be allowed to write prescription, as he/she was allowed license on some basis. It'll be great to have a supervisor's name on it, but sometimes, supervisors are busy, so at that time, one should be able to prescribe medicine in need, if they have a license issued by CPSA. That person should be responsible for writing prescription totally. In case, there's a supervisor available, one should discuss with him and then prescribe.