In the present scenario, the available editions of Charaka Samhita contain eight Sthanas only. Charaka Samhita does not contain Uttara-Tantra like Sushruta Samhita and Samhitas of Vagbhata. On contrary, in the 12(th) chapter of Siddhi Sthana, Charaka has mentioned about Uttara-Tantra of Charaka Samhita. So, it is essential to emphasize on this issue, which was not explained in length by commentators of Charaka Samhita. Many controversies raised on the existence and recognition of Uttara-Tantra of Charaka Samhita. On the other hand, some scholars who belong to a later period have been mentioned certain references in their work, which are claimed to be from Uttara-Tantra of Charaka Samhita. After a thorough study and scanning of available literature, it is concluded that, Charaka Uttara-Tantra was existing up to the time of Nishchalakara (13(th) century AD). Nishchalakara has quoted a number of references in Ratnaprabha, which are from Uttara-Tantra of Charaka Samhita. Furthermore, there is a need to discuss about the existence of Uttara-Tantra of Charaka Samhita by further more detailed study and scanning of literatures of Ayurveda and allied literatures.
Keywords: Chakrapanidatta; Charaka Samhita; Nishchalakara; Ratnaprabha; Tika; Uttara Tantra.