Common
Nothing by mouth
Withholding oral ingestion of food and fluids for medical purposes
Nothing by mouth
Nothing by mouth is an American medical instruction meaning to withhold food and fluids. It is also known as nil per os (npo or NPO), a Latin phrase that translates to English as "nothing through the mouth". Nil by mouth is the term used in the UK (NBM), nihil/non/nulla per os, or complete bowel rest. A liquid-only diet may also be referred to as bowel rest. NPO is one of the abbreviations that is not used in AMA style; "nothing by mouth" is spelled out instead. NPO except medications may be abbreviated to NPOEM.
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