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Nicotine absorption after pulmonary instillation.

D R Herrmann1, K M Olsen, F C Hiller

  • 1Division of Pulmonary and Critical Care Medicine, University of Arkansas for Medical Sciences, Little Rock 72205.

Journal of Pharmaceutical Sciences
|November 1, 1992
PubMed
Summary
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Nicotine absorption from the lungs in dogs shows equivalent total drug uptake compared to intravenous doses. However, tracheal instillation results in slower absorption and lower peak plasma nicotine concentrations.

Area of Science:

  • Pharmacokinetics
  • Respiratory System Physiology

Background:

  • Understanding nicotine absorption is crucial for evaluating smoking and vaping.
  • The tracheobronchial tree's role in drug delivery requires detailed investigation.

Purpose of the Study:

  • To compare nicotine absorption and pharmacokinetic profiles after intrapulmonary instillation at different airway levels versus intravenous administration.
  • To determine the impact of delivery site within the tracheobronchial tree on nicotine plasma concentrations and absorption rates.

Main Methods:

  • Gas chromatography was used to quantify plasma nicotine levels in eight mongrel dogs.
  • Nicotine (0.5 mg) was instilled into the trachea, a subsegmental bronchus, and a distal lung site.
  • An equivalent intravenous dose was administered for comparison.

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Main Results:

  • Peak plasma nicotine concentrations were significantly lower after tracheal (11.5 ng/mL) and subsegmental (18.2 ng/mL) instillation compared to intravenous (30.3 ng/mL) administration (p < 0.05).
  • Tracheal instillation yielded significantly lower peak concentrations than distal lung instillation (22.1 ng/mL) (p < 0.05).
  • Time to peak concentration was significantly longer after tracheal instillation (5.3 min) versus subsegmental (2.0 min) or intravenous (2.0 min) routes (p < 0.05).

Conclusions:

  • Total nicotine absorption, half-life, and clearance are comparable across all studied lung instillation sites and intravenous administration.
  • The lung facilitates equivalent nicotine absorption, but the specific airway site influences absorption rate and peak plasma levels.