A member asked:

Any reason why are most drugs given intravenous and not intra-arterial?

A doctor has provided 1 answer

Several reasons: Drugs given via an IV route have a chance to diffuse and dilute in the blood stream before hitting the capillaries of the periphery where they may have undesired effects. In addition the IV route has a first pass through the lungs which may successfully filter out particle that could hurt an peripheral arterial bed. IVs are also safer and more common.

Answered 2/5/2017

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