What does evacuant mean?
An evacuant is an agent — typically a drug or preparation — that empties the body's contents, most commonly the bowels, making it essentially synonymous with purgative or laxative in medical vocabulary. The word also functions as an adjective describing anything with this evacuating effect, as in 'an evacuant remedy.' Rooted in Latin evacuare, 'to empty out,' it entered English medical usage in the seventeenth century and was once a standard category in materia medica, alongside terms like cathartics and aperients. Today it reads as distinctly old-fashioned: a modern pharmacist would say laxative, and even clinical literature prefers gentler terminology. Nevertheless, evacuant remains useful to readers of historical medicine, pharmacology, and older prescriptions, where it signals a deliberate act of purging the system — whether to relieve constipation, prepare a patient for surgery, or rid the body of perceived toxins.
A purgative or laxative agent that empties the bowels or removes waste from the body.
"The doctor prescribed a gentle evacuant before the colonoscopy."
Chiefly found in historical and formal medical contexts.
Having the effect of emptying or purging the body; purgative.
"Senna has long been valued for its evacuant properties."
Regular plural; used when referring to multiple such agents or preparations.
"Nineteenth-century formularies listed dozens of evacuants of varying strength."
Before modern pharmacy gave us gentle laxatives, doctors reached for 'evacuants' — a word that sounds like a sci-fi device but simply means something that empties you out.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of evacuant
Evacuant derives from the Latin verb evacuare, meaning 'to empty out,' formed from ex- ('out') and vacuus ('empty') — the same root that gives English 'vacuum' and 'vacant.' It passed into English in the early modern period as a term of medicine, where it named remedies believed to purge or empty the body of harmful humors. Its cognates include 'evacuate' and 'evacuation,' which broadened beyond medicine into general use.
How evacuant is actually used
A technical term of chiefly historical and medical register; in contemporary practice, words like 'laxative' or 'purgative' are far more common. 'Evacuant' survives mainly in older medical texts and pharmacological writing.
Easily confused with evacuant
An evacuee is a person evacuated from a place of danger, while an evacuant is a medical agent that empties the bowels.