The abbreviation PO indicates administration by which route?

The abbreviation PO indicates administration by which route?

• A. By mouth
• B. By vein
• C. Inhalation
• D. Topical

Answer: (A)

PO stands for per os, a Latin term meaning “by mouth.” When a medication is labeled PO, it should be swallowed and absorbed through the gastrointestinal tract rather than being injected, inhaled, or applied to the skin. This distinguishes it from other routes such as intravenous (injected into a vein), inhalation (breathed in), or topical (applied to the skin). Oral administration is common and convenient, though its onset can be slower and it may be influenced by factors like food in the stomach and first-pass metabolism in the liver.

PO stands for per os, a Latin term meaning “by mouth.” When a medication is labeled PO, it should be swallowed and absorbed through the gastrointestinal tract rather than being injected, inhaled, or applied to the skin. This distinguishes it from other routes such as intravenous (injected into a vein), inhalation (breathed in), or topical (applied to the skin). Oral administration is common and convenient, though its onset can be slower and it may be influenced by factors like food in the stomach and first-pass metabolism in the liver.