IV stands for which route of administration?

• A. Inhalation
• B. Intramuscular
• C. Oral
• D. Intravenous

Answer: (D)

Abbreviations for routes of administration tell you where the drug enters the body. IV stands for intravenous, meaning the drug is injected into a vein for rapid entry into the bloodstream and quick, controllable effects. This contrasts with inhalation, which delivers through the airways into the lungs; intramuscular, which places the drug into muscle tissue for slower absorption; and oral, which is swallowed and absorbed via the digestive system, often with first-pass metabolism reducing active drug amounts. In dentistry and pharmacology, intravenous administration is used when a fast onset and precise dosing are needed, such as for certain anesthesia or emergencies.