Rasashastra and Bhaishajya Kalpana subject mainly deals with the manufacturing of Ayurvedic medicines and knowledge of different types of Dravya.

Rasashastra is a very important branch of Ayurveda which deals with the knowledge of metals – minerals and manufacturing medicines from these Rasa Dravya. Ancient Acharya has mentioned the supremacy of Rasa Chikitsa from all the sciences at many places.

Generally the patient who suffers from diseases expects three things from any branch of treatment:

Rasaushadhi which is prepared by using mercury and other related drugs is highly effective and has capacity to fulfil these three expectations of the patients.

Due to different processes like Shodhana, Marana, Samskara etc, the material converts into Nano form which makes quick assimilation in small doses in the body. Due to its tasteless property, the patient can overcome the unpleasant taste of herbal drugs by using it. It gives quick result when compared to herbal drugs.

Mercury has miraculous properties and important place in various kinds of processing called Samskara for the purpose of converting lower metals into higher metal in alchemy. It is used for the incineration of metals and minerals for the elimination of their toxic components and generates therapeutic value. In the end product generally known as Bhasma usable for the body hence they can be used as Rasayana.

Bhaishajya Kalpana deals with fundamentals and preparatory methods of various Kalpana (dosage form) like Svarasa (juice), Kalka (paste), Kvatha (decoction), Hima, Phanta, Sneha Kalpana (Ghrita-Taila etc), Sandhana Kalpana (Asava-Arishta etc), Churna (powders), Ghana, Guggulu Kalpana, Vati (pills/tablet), Varti (suppositories), Avaleha, Aushadha Siddha Paniya,  Arka, Sharkara (syrup), Ksheerapaka, Satva, Masi, Lavana, Kshara, Kshara Sutra, Kritanna Kalpana, Lepa Kalpana, Malahara Kalpana etc.