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Four important factors for producing maximum therapeutic efficacy of these drugs are identified. ''Deshasampat'' (collecting the plant from appropriate habitat), ''kalasampat'' (collecting the drugs in the appropriate season), ''gunasampat'' (collecting the plants when they are enriched with excellent attributes like ''rasa'', ''guna'', ''virya'', etc.) and ''bhajanasampat'' (storage of drugs in appropriate container).
 
Four important factors for producing maximum therapeutic efficacy of these drugs are identified. ''Deshasampat'' (collecting the plant from appropriate habitat), ''kalasampat'' (collecting the drugs in the appropriate season), ''gunasampat'' (collecting the plants when they are enriched with excellent attributes like ''rasa'', ''guna'', ''virya'', etc.) and ''bhajanasampat'' (storage of drugs in appropriate container).
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==== Pharmacokinetic of Drugs ====
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==== Pharmacokinetics of Drugs ====
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Drugs (used for emesis and purgation) which are ''ushna'' (hot), ''tikshna'' (sharp), ''sukshma'' (subtle), ''vyavayi'' (those pervading the entire body before getting digested) and ''vikasi'' (those causing looseness of joints), by virtue of their own potency, reach the heart and circulate through the vessels. Because of their ''agneya'' nature (predominance of ''agni mahabhuta'', or fire element), they liquefy the compact form of (adhered) ''doshas'' (morbid material), and because of their sharpness (''tikshna'' attribute) they separate the adhered ''doshas'' located in the gross and subtle channels of the entire body.  Like honey kept in the pot smeared with fat, the morbid material, after separation, moves floating without adhesion in the body which has been oleated (by the administration of oleation therapy). Because of its nature to move through subtle channels and to flow (towards the gastrointestinal tract), this morbid material reaches the stomach, and gets propelled by ''udana vayu''. Because of the predominance of ''agni'' and ''vayu mahabhutas'' in these (emetic) drugs, and because of their specific action (''prabhavajanya'') to move upwards, the morbid material gets expelled through the upward tract (mouth). On the other hand, purgative drugs, because of the predominance of ''prithvi'' and ''jala mahabhutas'', and because of their specific action, (''prabhavajanya'') move downwards to expel the morbid material through the downward tract (anus). Combination of both these attributes result in the expulsion of the morbid material through both the upward and downward tracts.  
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Drugs (used for emesis and purgation) which are ''ushna'' (hot), ''tikshna'' (sharp), ''sukshma'' (subtle), ''vyavayi'' (those pervading the entire body before getting digested) and ''vikasi'' (those causing looseness of joints), by virtue of their own potency, reach the heart and circulate through the vessels. Because of their ''agneya'' nature (predominance of ''agni mahabhuta'', or fire element), they liquefy the compact form of (adhered) ''doshas'' (morbid material), and because of their sharpness (''tikshna'' attribute) they separate the adhered ''doshas'' located in the gross and subtle channels of the entire body.  Like honey kept in the pot smeared with fat, the morbid material, after separation, moves floating without adhesion in the body which has been oleated (by the administration of oleation therapy). Because of its nature to move through subtle channels and to flow (towards the gastrointestinal tract), this morbid material reaches the stomach, and gets propelled by ''udana vayu''. Because of the predominance of ''agni'' and ''vayu mahabhutas'' in these (emetic) drugs, and because of their specific action (''prabhavajanya'') to move upwards, the morbid material gets expelled through the upward tract (mouth). On the other hand, purgative drugs, because of the predominance of ''prithvi'' and ''jala mahabhutas'', and because of their specific action, (''prabhavajanya'') move downwards to expel the morbid material through the downward tract (anus). Combination of both these attributes result in the expulsion of the morbid material through both the upward and downward tracts.
    
==== Similarities/ Dissimilarities of ''virya'' ====
 
==== Similarities/ Dissimilarities of ''virya'' ====