The type of poison is primarily based on positive primary standards like beginning, base, houses, potency and so forth. Some of the ayurvedic classics and texts in medieval length have labelled all of the poisons into classes as mahavisha and upavisha basing on their toxicity and efficiency.
Upavisha is the organization of drugs, that are less poisonous in nature and now not so lethal but produce sure toxic symptoms on consumption or management. The signs and symptoms produced inside the frame because of upavisha are much less toxic, less extreme, commonly not life-threatening and their toxicity can be controlled through therapeutic measures.

Extensively ‘vishas’ are labelled Into 3 sorts viz. sthavara, jangam and kritrima. ‘Sthavara vishas’ are the ones which belong to minerals or to a group of poisonous herbs, even as ‘jangama vishas’ is received from the animal country. the ‘kritrima vishas’ are fashioned because of undesired compounding of drugs. The various toxic herbs- tuberous and / or root poisons are more poisonous.