in a way that involves putting food substances or medicine into someone's digestive system (= the organs in the body where food is digested), rather than into the veins, for example

Some drugs cannot be used enterally because their effect on the digestive tract is unclear. 有些药物不能在肠内使用，因为它们对消化道的作用尚不清楚。

This drug should only be administered enterally.