Per os

Per os

Per os (P.O.) is an adverbial phrase meaning literally from Latin "by mouth" or "by way of the mouth." The expression is used in medicine to describe a treatment that is taken orally. The abbreviated P.O. is often used on medical prescriptions.

P.O. is also occasionally (and grammatically incorrectly) rendered per orem, which is sometimes corrupted to per oram.

Pronunciation

*British: pər'əoυs
*U.S.: pər'oυs

ee also

*Nil per os
*List of Latin phrases
*Medical prescription
*List of abbreviations used in medical prescriptions


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