Sublingual and oral administration differ in the absorption rate, utilization rate and route of drug administration, as follows: 1. Oral administration can effectively absorb the drug and improve the utilization rate of the drug; oral administration is to put the drug into the mouth and swallow it into the stomach, and oral medication should be used for life; 2. Sublingual administration has a much lower absorption effect, and the drug components are absorbed directly into the blood through the sublingual mucosa, although it can quickly play a role, but the duration is short and the absorption rate is not high; sublingual administration means that the drug is contained under the tongue and can be absorbed into the blood directly through the capillaries under the tongue, and the drug is absorbed through the capillary walls, which can be absorbed completely and quickly; because the amount of drugs under the tongue is limited, it is mainly used for emergency treatment, and sublingual administration of nitroglycerin and other drugs when angina pectoris of coronary heart disease occurs can rapidly It can dilate the heart and blood vessels, thus improving the blood supply to the heart muscle, faster than oral drugs.