PO means oral, and is a form of drug delivery. Oral medications are usually in the form of tablets, capsules, and small pellets and pills. Patients take oral medication to treat their diseases, but the route of administration is to absorb the medication in the intestine, so the effect is slow, so it is recommended that patients must take the medication orally in a full course and regularly to treat the disease. If you have chronic diseases, such as hypertension, diabetes, etc., oral medication is generally preferred for treatment to avoid unnecessary damage due to long-term injections or intravenous infusions.