<P> In general medicine , enteral administration ( Greek enteros , `` intestine '' ) is food or drug administration via the human gastrointestinal tract . This contrasts with parenteral nutrition or drug administration ( Greek para , `` besides '' + enteros ) , which occurs from routes outside the GI tract , such as intravenous routes . Enteral administration involves the esophagus , stomach , and small and large intestines ( i.e. , the gastrointestinal tract ) . Methods of administration include oral , sublingual ( dissolving the drug under the tongue ) , and rectal . Parenteral administration is via a peripheral or central vein . In pharmacology , the route of drug administration is important because it affects drug metabolism , drug clearance , and thus dosage . </P>
<P> In general medicine , enteral administration ( Greek enteros , `` intestine '' ) is food or drug administration via the human gastrointestinal tract . This contrasts with parenteral nutrition or drug administration ( Greek para , `` besides '' + enteros ) , which occurs from routes outside the GI tract , such as intravenous routes . Enteral administration involves the esophagus , stomach , and small and large intestines ( i.e. , the gastrointestinal tract ) . Methods of administration include oral , sublingual ( dissolving the drug under the tongue ) , and rectal . Parenteral administration is via a peripheral or central vein . In pharmacology , the route of drug administration is important because it affects drug metabolism , drug clearance , and thus dosage . </P>
drugs that are subjected to the first pass affect enter the body by which route
drugs that are subjected to the first pass affect enter the body by which route
the human gastrointestinal tract
the human gastrointestinal tract