Yeas!!  you can prescribe pharmaceutical medicine in Emergency after completing BNYS..

Source CCRYN.....!!

Hello student ,

Bachelor in Naturopathy and Yoga Science doctors can not do practice allopathy because during their course study they has been taught about the modern medicines of allopathy so how could they practice this . But as per the government guidelines you can give allopathy medicine only in emergency if you have good knowledge about that . As only qulified doctors of any particular field can only prescribe about any medicine or can practice for their partivular course  .

Hope this will help you !