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Family Physician
Family Physician, Doctor
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Experience:  Emergency Medicine and Family Practice for over 26 years
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Which drug administration route produces the most rapid drug

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Which drug administration route produces the most rapid drug response and has an almost immediate onset of action?

a. Topical
b. Inhalational.
c. Oral
d. Injectable
Unfortunately, the answer is a bit more complicated that one might imagine. The specific medication involved, the site of action and the specifics of the injection (intravenous, intramuscular, or subcutaneous) would alter the answer.

The two fastest would be inhalation (example nicotine inhaled into the lung has almost immediate effect ont the brain) and INTRAVENOUS injection (example would be epinepherine or adenosine given for heart rhythm problems)
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