The medical abbreviation "NPO" stands for "nil per os", which is a Latin phrase that means "nothing by mouth". In medical settings, "NPO" is often used as an instruction to a patient not to eat or drink anything for a certain period of time.
For example, a patient might be instructed to be "NPO" for several hours before a medical procedure, to ensure that their stomach is empty and reduce the risk of complications such as aspiration. Similarly, a patient with certain medical conditions might be instructed to be "NPO" for a period of time to help manage their symptoms.
It's important to follow instructions to be "NPO" carefully, as eating or drinking when instructed not to can cause complications or interfere with medical procedures. If you have any questions or concerns about being "NPO", it's important to talk to your healthcare provider.