11 doctors weighed in:
Why doesn't local anesthesia spread to the whole body?
11 doctors weighed in

Dr. Scott Mackinnon
Anesthesiology
7 doctors agree
In brief: "Local" is why
"local" anesthesia does just that-a small dose of a numbing agent is injected near a nerve, that, when in a certain concentration, blocks impulses through that nerve.
The result is numbness and weakness in the distribution of that nerve. This resolves as the local anesthetic is 'washed out" by blood and the localized concentration now will decrease-allowing the nerve to work again.

In brief: "Local" is why
"local" anesthesia does just that-a small dose of a numbing agent is injected near a nerve, that, when in a certain concentration, blocks impulses through that nerve.
The result is numbness and weakness in the distribution of that nerve. This resolves as the local anesthetic is 'washed out" by blood and the localized concentration now will decrease-allowing the nerve to work again.
Dr. Scott Mackinnon
Dr. Scott Mackinnon
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Dr. Richard Pollard
Anesthesiology
1 doctor agrees
In brief: Placement
Local anesthetics are placed directly around nerves, or in limited areas of the body.
Once placed there is no mechanism to transport the medications. To make it around the body a drug needs to be placed in the bloodstream.

In brief: Placement
Local anesthetics are placed directly around nerves, or in limited areas of the body.
Once placed there is no mechanism to transport the medications. To make it around the body a drug needs to be placed in the bloodstream.
Dr. Richard Pollard
Dr. Richard Pollard
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Dr. David Edsall
Anesthesiology
In brief: It does
All drugs sread out inside the body.
Imagine a pinch of slat on ur finger. It will taste salty. Nwo spread over all ur body . No more salty taste. Increase the pinch a lot and it will be salty. To nmb a nurve just put a pinch near it. When it spreads out no more numb. Increase the dose 100x and the body is numb all over but first you get heart changes and seizures.

In brief: It does
All drugs sread out inside the body.
Imagine a pinch of slat on ur finger. It will taste salty. Nwo spread over all ur body . No more salty taste. Increase the pinch a lot and it will be salty. To nmb a nurve just put a pinch near it. When it spreads out no more numb. Increase the dose 100x and the body is numb all over but first you get heart changes and seizures.
Dr. David Edsall
Dr. David Edsall
Thank
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