Quinine-induced alterations in drug disposition

Area of Science:

• Pharmacology
• Drug Metabolism
• Clinical Pharmacology

Background:

• Drug interactions can alter pharmacokinetic profiles.
• Quinine and antipyrine are commonly studied drugs for interaction.
• Understanding drug disposition is crucial for safe and effective therapeutic use.

Purpose of the Study:

• To investigate the pharmacokinetic interaction between quinine and antipyrine in humans.
• To determine the effect of chronic quinine administration on antipyrine disposition.
• To explore the dose-dependent disposition of quinine.

Main Methods:

• Administered quinine chronically to healthy volunteers.
• Measured plasma antipyrine and quinine half-lives and disposition.
• Utilized a two-compartment open model for quinine disposition in dogs.

Main Results:

• Chronic quinine shortened plasma antipyrine half-life, indicating enhanced metabolism.
• A dose-dependent prolongation of quinine half-life was observed.
• Quinine's volume of distribution appeared to increase with dose.

Conclusions:

• Quinine enhances antipyrine metabolism.
• Dose and administration time significantly influence drug interactions.
• Further studies are needed to fully elucidate quinine's distribution effects.