Oral

Oral administration is the delivery of a substance by mouth so that it is swallowed and absorbed through the digestive tract.

It is the most common route for medicines and supplements because it is convenient, painless, and familiar. A swallowed compound must dissolve, survive stomach acid, cross the intestinal wall, and pass through the liver before reaching general circulation, a sequence that slows onset, lowers bioavailability, and introduces variability. Capsules, softgels, gummies, edibles, beverages, and swallowed oils all belong to this route. Anything held under the tongue and then swallowed is also largely oral in practice.

For cannabidiol, oral bioavailability is low and variable, and clinical studies show that taking it with a high-fat meal can raise exposure several-fold compared with a fasted state. Onset is typically slower and the duration longer than with inhaled or sublingual products. Prescription cannabidiol is an oral solution, and most of the published human safety data come from oral administration. Readers meet this term on labels, in study methods, and in comparisons between routes.