The patient is instructed to take nothing by mouth, which means to abstain from eating and drinking (fasting), with the exception of drinking the barium sulfate suspension.
Nil per os (Latin), a medical instruction (NPO), for patients who may not take any substances orally for various reasons
Qasr al-Nil Bridge | Nil Ratan Sircar Medical College and Hospital | Nil per os | Nil Karaibrahimgil | One Nil | Generał Nil | De mortuis nil nisi bonum |