Editing Route of administration (section)

===Desired target effect===
Identical drugs can produce different results depending on the route of administration. For example, some drugs are not significantly absorbed into the bloodstream from the gastrointestinal tract and their action after enteral administration is therefore different from that after parenteral administration. This can be illustrated by the action of [[naloxone]] (Narcan), an antagonist of [[opiate]]s such as [[morphine]]. Naloxone counteracts opiate action in the [[central nervous system]] when given intravenously and is therefore used in the treatment of opiate overdose. The same drug, when swallowed, acts exclusively on the bowels; it is here used to treat constipation under opiate pain therapy and does not affect the pain-reducing effect of the opiate.