Final answer:
Sublingual administration is a method of drug delivery where the drug is placed under the tongue for absorption into the bloodstream, useful for drugs that are not easily absorbed by the GI tract.
Step-by-step explanation:
The drug form where the active ingredient is placed under the tongue and absorbed directly into the bloodstream is known as a sublingual administration. This route bypasses the gastrointestinal (GI) tract, providing an alternative for drugs that are not easily absorbed via the GI tract or for patients who are unable to take oral medications due to illness, such as vomiting or being intubated for a respirator. Sublingual administration can be more convenient than parenteral routes (intravenous or intramuscular injection) and allows for fast absorption into the circulation system, which is critical for certain conditions requiring rapid onset of action.