भेषजं च द्विविधं च तत
स्वस्थस्योजस्कर किंचित किन्चिदार्तस्य रोगानुत II
Ref: Charaka Samhita Chikitsa Sthana :1/4
There are two type of Medicines.
1.Medicine which increases the Dynamic Glow of the body spiritually and Mentally.
2. Medicines which eliminates the ailments.
Acharya Susruta Explained in Sutra Sthana chapter 26 as :
नानाऔषधिभूतं जगतिकिंचिद द्रव्यमूप् लभ्यते I
In this world all the materials available can be used as Drug.Means, if you know the Dose, Duration and Effect of that Material (Dravya).You can use that Material (Dravya) as Medicine.
Acharya Charaka has explained ABHESAJA (Means that Material which has a life threatening effect or not eliminates ailments but provokes it )
अभेषजं च द्विविधं बाधनं सानुबाधनं II
Ref. Charaka Samhita Chikitsa Sthana :1/5
BAADHANA:Means that Material which provokes the ailments immediately like Poison,Burn,Accidental injury by any Material. We can understand it as acute onset.
Means that Material which progressively shows his ill effects.
We can understand it as Chronic ailments.