Which injection route is used to deliver medication directly into the bloodstream?

Which injection route is used to deliver medication directly into the bloodstream?

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

Answer: (B)

Delivering medication directly into the bloodstream is achieved through the intravenous route. This method places the drug into the venous system, allowing almost immediate entry into systemic circulation for rapid effect and precise control of dosing. The other routes require the drug to be absorbed first: intramuscular injections go into muscle tissue and then diffuse into blood vessels, giving a slower onset; subcutaneous injections enter the fatty layer under the skin and absorb even more slowly; oral administration involves swallowing the drug, where it must be absorbed through the digestive tract and may undergo first-pass metabolism before reaching the bloodstream.

Delivering medication directly into the bloodstream is achieved through the intravenous route. This method places the drug into the venous system, allowing almost immediate entry into systemic circulation for rapid effect and precise control of dosing. The other routes require the drug to be absorbed first: intramuscular injections go into muscle tissue and then diffuse into blood vessels, giving a slower onset; subcutaneous injections enter the fatty layer under the skin and absorb even more slowly; oral administration involves swallowing the drug, where it must be absorbed through the digestive tract and may undergo first-pass metabolism before reaching the bloodstream.