Anuktha dravyas

I am … PG SCHOLAR IN DRAVYAGUNA VIJNANA.
I have been getting doubts about anuktha dravyas (extra pharmacoepial drugs) as i have read anuktha dravya concept in sharangadhara samhitha chapter 1…but recently  got to know that even in dravyaguna anuktha dravya has been explained but the where abouts are unclear, so requsting your help to know about it.. please do help me about the same.