pācana: what the term means and how it is translated
pācana पाचन is an Ayurvedic technical term. It is rendered into English in 10 different ways, which is the reason this page exists: the renderings do not agree, and the difference between them changes what the term is taken to mean.
| Transliteration | pācana |
|---|---|
| Devanagari | पाचन |
| Also written | pācanam, pācana karma, āmapācana, dīpana-pācana (the combined action) |
| Category, as gathered | therapeutics / dravyaguna action |
| Grouped here under | Pharmacology and the action of substances |
| Classical citations | 5 |
| Citations checked | 2026-10-08 |
How it is translated, and whether the translation holds
Each rendering is given with the source that uses it. The assessment is ours.
Digestion
WHO International Standard Terminologies on Ayurveda (2022) · ITA-2.6.30 · terminology-standard
WHO's PHYSIOLOGICAL sense, description verbatim: 'The fundamental function of transformative factors in the gastrointestinal tract.' Note this is a completely different sense from the therapeutic one below, and WHO gives them separate term IDs under the same Sanskrit headword.
Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that licence permits. It is deliberately absent from the downloadable dataset, which is offered under CC BY 4.0 and invites the modification a NoDerivs licence forbids.
Digestive action
WHO International Standard Terminologies on Ayurveda (2022) · ITA-6.2.6.8 · terminology-standard
WHO's THERAPEUTIC sense, description verbatim: 'A drug which directly acts on products of incomplete digestion, transformation or metabolism (ama) but does not kindle digestive fire'. The 'but does not kindle digestive fire' clause is the whole definition and reproduces Śārṅgadhara exactly.
Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that licence permits. It is deliberately absent from the downloadable dataset, which is offered under CC BY 4.0 and invites the modification a NoDerivs licence forbids.
Stimulating digestive fire or appetizing action
WHO International Standard Terminologies on Ayurveda (2022) · ITA-6.2.6.7 (dīpanam) — the contrast term · terminology-standard
Given for contrast; verbatim: 'A therapeutic action which kindles digestive fire without directly acting on the products of incomplete digestion, transformation or metabolism (ama). It also denotes the procedure for preparing mercury to amalgamate other substances.' WHO thus records a third, rasaśāstra sense of dīpana.
Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that licence permits. It is deliberately absent from the downloadable dataset, which is offered under CC BY 4.0 and invites the modification a NoDerivs licence forbids.
Haemostasis by chemical cautery.
WHO International Standard Terminologies on Ayurveda (2022) · ITA-9.6.109 (pācanam, in the surgical chapter) · terminology-standard
A THIRD WHO entry under the same Sanskrit headword, in surgery: 'A method haemostasis using local applications such as bhasma, sprays or dustings.' Three distinct WHO term IDs share the lemma pācanam. Any term-mapping pipeline must disambiguate by context.
Reproduced unaltered and attributed from the WHO International Standard Terminologies on Ayurveda, which is what that licence permits. It is deliberately absent from the downloadable dataset, which is offered under CC BY 4.0 and invites the modification a NoDerivs licence forbids.
digestant (Pachana)
Sushruta Samhita, tr. Kaviraj Kunja Lal Bhishagratna (1907-1916) · Sūtrasthāna Chapter XXXVIII, p. 353 · public-domain-translation
Verbatim: 'and acts as a good digestant (Pachana).' Also at p. 356: 'It acts as a good digestant in respect of undigested lymph chyle, etc.', i.e. Bhishagratna understands the object of pācana to be āma-rasa.
Pachanam (process of setting up suppuration in the wound)
Sushruta Samhita, tr. Kaviraj Kunja Lal Bhishagratna (1907-1916) · Sūtrasthāna (haemostasis section), vol. I · public-domain-translation
Bhishagratna's rendering of the surgical homonym, listed among the four measures for stopping bleeding alongside sandhāna, skandana and dahana. Independent confirmation of the sense WHO codes at ITA-9.6.109, though Bhishagratna glosses it as suppuration rather than chemical cautery, the two glosses differ and that difference is worth recording.
drugs which assist in digesting undigested food, without increasing the appetite
Charaka Samhita, tr. Avinash Chandra Kaviratna (1896-1913) · Cikitsāsthāna Lesson XV (= Ca.Ci.15.75), in-text gloss · public-domain-translation
Kaviratna's in-text parenthetical. His companion footnote on dīpana reads verbatim: 'Drugs that increase the appetite without aiding digestion of undigested food, are called "Dipana" or "Dipaniya."' The two glosses together reproduce the Śārṅgadhara definitions precisely.
no NAMASTE code
NAMASTE / National AYUSH Morbidity Codes (NAMC) · searched the NAMC term list for 'pAcan': zero hits · terminology-standard · our paraphrase of the source, not its words
Expected: NAMC is a morbidity code set and does not code therapeutic actions.
no ICD-11 TM2 category
ICD-11 MMS v2026-01, TM2 · classification · our paraphrase of the source, not its words
ICD-11 TM2 codes conditions, not interventions.
carminative / digestive / ama-digesting
Textbook dravyaguṇa usage · secondary-literature · our paraphrase of the source, not its words
'Carminative' is common in older Indian pharmacological writing and is a category error; see mistranslations.
The classical passages
Each citation gives its address so a reader can check it in a printed edition, our account of what the passage establishes, and the result of reading it against its source.
Śārṅgadhara Saṃhitā (Sanskrit)Pūrvakhaṇḍa 4 (Dīpana-pācanādi-kathanam):1-2 · checked against the source
तत्र दीपनद्रव्यलक्षणम् पचेन्नामं वह्निकृच्च दीपनं तद्यथा मिशिः १ पाचनदीपनपाचनद्रव्ययोर्लक्षणे पचत्यामं न वह्निं च कुर्याद्यत्तद्धि पाचनम् नागकेशरवद्विद्याच्चित्रो दीपनपाचनः २
THE canonical definition, and a clean triple contrast. dīpana does not digest āma but kindles agni (example: miśi/fennel). pācana digests āma but does not kindle agni (example: nāgakeśara). citraka is both. This is the source WHO's ITA-6.2.6.7 and 6.2.6.8 descriptions reproduce almost word for word, and the source Kaviratna's 1890s glosses independently match.
Charaka SaṃhitāCikitsāsthāna 15:75 (Kaviratna prints 74) · checked against the source
If undigested food adheres to the 'Pakkaçaya' (that part of the stomach where digestion takes place), it should be expelled by such drugs as are called 'Dipana.' When the 'ama Rasa' (i. e., the undigested juice of the food taken) spreads over the whole body, fasting and the administration of 'Pachana' (i. e., drugs which assist in digesting undigested food, without increasing the appetite) are prescribable.
Public-domain English for the clinical rule: dīpana for localised āma in the gut, laṅghana plus pācana for āma that has spread systemically. The Sanskrit reads 'शरीरानुगते सामे रसे लङ्घनपाचनम्'.
Charaka Saṃhitā (Sanskrit)Cikitsāsthāna 15:75 · checked against the source
लीनं पक्वाशयस्थं वाऽऽप्यामं स्राव्यं सदीपनैः। शरीरानुगते सामे रसे लङ्घनपाचनम्॥७५॥
Sanskrit fixing the verse number and showing that pācana is prescribed as a compound with laṅghana (laṅghana-pācana), not as a standalone action.
Aṣṭāṅga Hṛdaya (Sanskrit)Sūtrasthāna 14 (Dvividhopakramaṇīya):13 · checked against the source
vibandha-gauravodgāra-hṛl-lāsādibhir āturān | madhya-sthaulyādikān prāyaḥ pūrvaṃ pācana-dīpanaiḥ || 13 ||
Vāgbhaṭa prescribes pācana-dīpana as the first step for patients presenting with constipation, heaviness, eructation and nausea, before other measures. Chapter fixed by the file's own internal variant markers (14.14cv, 14.14dv) immediately following.
Sushruta SaṃhitāSūtrasthāna XXXVIII:prose, p. 353 of Bhishagratna vol. I · checked against the source
The group under discussion destroys the deranged Shleshma, cures uterine and vaginal disorders, purifies the breast milk of a mother, and acts as a good digestant (Pachana).
Public-domain English attestation of pācana as a drug-group property in Sushruta's gaṇa chapter. Bhishagratna renders it 'digestant' and does not distinguish it from dīpana anywhere I could find.
Not to be confused with
- dīpana
- The defining contrast, and the one the whole Śārṅgadhara chapter exists to draw. dīpana kindles agni without acting on āma; pācana acts on āma without kindling agni. Kaviratna, Śārṅgadhara and WHO all agree. Clinical writing that uses 'dīpana-pācana' as a single hyphenated action erases it, though Śārṅgadhara himself names citraka as a drug that is both, so the compound is legitimate for some dravyas.
- pācana (physiological digestion)
- WHO ITA-2.6.30 uses the same lemma for the bodily process of digestion, not a therapeutic action. Two senses, two term IDs.
- pācana (surgical)
- A third sense entirely: WHO ITA-9.6.109 'Haemostasis by chemical cautery', and Bhishagratna's 'process of setting up suppuration in the wound'. In a surgical context the word means ripening or cauterising, not digesting. Note WHO's and Bhishagratna's glosses of this surgical sense do not agree with each other.
- laṅghana
- Fasting/lightening. Ca.Ci.15.75 prescribes them together (laṅghana-pācana) for systemic āma, but they are distinct measures; laṅghana withholds, pācana acts.
- āmapācana
- Usually treated as a synonym, but it specifies the object. Since Śārṅgadhara's definition already makes āma the object, the compound is pleonastic, worth noting rather than treating as a separate action.
- anulomana
- Śārṅgadhara Pū.Kh.4.4 defines anulomana separately ('having effected pāka of the malas, breaking the obstruction, it carries them downward'). It includes a pāka step and is therefore easily confused with pācana.
Renderings that do not hold
- carminative. A pharmacological class defined by relief of flatulence. It has no relation to the Śārṅgadhara criterion (digests āma, does not kindle agni), and many classical pācana dravyas are not carminative. Common in older Indian materia medica in English.
- digestive / digestive stimulant. 'Digestive stimulant' is precisely dīpana, the contrast term. Using it for pācana inverts the one distinction the classical definition exists to make. Bhishagratna's 'digestant' has the same ambiguity.
- appetiser. WHO explicitly attaches 'appetizing action' to dīpana (ITA-6.2.6.7), not pācana, and Kaviratna's gloss says pācana works 'without increasing the appetite'.
- detoxifier. Follows from the 'āma = toxin' error and turns a specific digestive action into a marketing category.
Open questions
Recorded rather than resolved. Each one is something this entry cannot currently settle.
- Does WHO's ITA-9.6.109 gloss of surgical pācana as 'chemical cautery' match the Sanskrit, or is Bhishagratna's 'suppuration' the better reading?
- Is there any assay or biomarker by which a candidate drug could be classed as pācana rather than dīpana?
- Does any text earlier than Śārṅgadhara give the pācana/dīpana definitional contrast, or is Śārṅgadhara its origin? Kaviratna's Charaka gloss reproduces it but is a 19th-century translator's note, not the mūla.
How to cite this entry
Age Ayurveda Nighantu, pācana
, https://nighantu.ageayurveda.com/lexicon/pachana/, CC BY 4.0.
The whole lexicon is downloadable from the index.
Machine-readable source: Markdown.
Data exported 2026-10-08.
Educational reference only. A term entry explains what a word means and how it has been translated. Nothing here is advice, and nothing here describes how any condition should be treated.