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→Preamble of Kalpa Sthana of the Charaka Samhita
A healthy individual is an asset to any society (and contributes to making a healthy society), while a sick individual will be a liability to the family and society. To keep oneself healthy, Ayurveda laid down the principles of various lifestyles with regard to daily regimen (''dinacharya''), seasonal regimen (''ritucharya'') and modified lifestyles to cure the diseases. Physical exercise for the preservation of health begins with the adaptation of purification of body and mind along with intake of ''rasayana'' drugs (rejuvenating agents). Accumulation of ''malas'' (metabolic waste) at the level of cell, tissue or organ should be expunged out to facilitate the restoration of normal functioning of the body by five purificatory procedures (''shodhana karma'') often referred as [[Panchakarma]], namely ''vamana'' (emesis), ''virechana'' (purgation), ''asthapana basti'' (evacuative enema), ''anuvasana basti'' (restorative enema), and ''shirovirechana'' (errhines) are indicated for healthy as well as diseased. If ''malas'' are not taken out of the body, they cause diseases and decay (ageing) of the body. After purification procedures, ''jatharagni'' (gastro-intestinal digestive juices) becomes weak and may not digest the food normally. For restoration of this function, the food that is easily digestible is introduced and increased gradually over a period of time and this procedure is called ''samsarjana karma''. Details of pharmaceutical process of drugs employed in ''vamana'' and ''virechana'' procedures are given in this section and detailed therapeutic implications of all the ''shodhana'' karma in [[Siddhi Sthana]].
''Vamana'' and ''virechana'' therapies should be administered before administering ''basti'' (medicated enema therapy). Therefore, ''vamana'' and ''virechana'' drugs are first described in Kalpa Sthana before the description of therapy, which is described in detail under [[Siddhi Sthana]]. Generally, purgation therapy is administered only after the administration of emetic therapy and keeping this view the first six chapters are allocated for description of emetic drugs.
Six drugs are described for emesis and nine others are described for purgation. Six hundred recipes prepared from these drugs (Total 15 drugs) are for the use of physician of low caliber and intelligent physician can formulate many other recipes to suit the exact requirement of his patient. The formulations are prescribed according to disease in different dosage forms like ''kashaya'' (decoction), ''svarasa'' (juice), ''kalka'' (paste), ''churna'' (powder), ''peya'' (drinks), ''lehya'' (lickable), and ''bhojya'' (foods).
Ayurvedic classics have advocated to collect the medicinal plants according to part used and seasons in order to get desired pharmacological action and therapeutic benefits. Sushruta, Charaka and other acharyas advocate the collection of various parts of medicinal plants in different seasons. The logic behind such recommendations has been validated by recent modern scientific research.
In a study the variations in the phytoconstituents of ''Ashwagandha'' root was evaluated according to lunar cycles with regard to ''grishma'' and ''shishira ritu'' (summer and late winter season). In this study, total phenolic, flavonide and carbohydrate content of ''Ashwagandha'' root were found more in ''poornima'' (full moon day) samples. GAP (''Grishma Ashadha Poornima'', or the full moon night occurring in the ''Grishma-Ashadha'' season) samples showed maximum differentiation from rest of the samples with regards to TCA, TCW, TFW, MEx, WEX, pH etc. parameters. The ''Grishma-Jyeshtha Poornima'' (GJP) and GAP samples were found to be superior than ''Amavasya'' (new moon day) samples with regard to functional groups and with anoloid content respectively (Ref. 2016 Ancient Science of Life) . Such type of studies validate the concept of seasonal collection of drug delineated in Ayurveda classics like [[Charaka Samhita]] and [[Sushruta Samhita]].