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Measurement of Bioavailability: Pharmacodynamic Methods

Pharmacodynamic methods provide insights into a drug's effects on physiological processes over time and play a crucial role in understanding bioavailability and therapeutic efficacy. These methods can be broadly classified into acute pharmacological and therapeutic response approaches, each with distinct mechanisms and applications.The acute pharmacological response method directly correlates a drug's physiological effects, such as ECG or pupil diameter changes, to its time course in the body.
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It is not uncommon for complete drug pharmacokinetic profiles to remain elusive in pharmacokinetics. This necessitates certain educated assumptions by pharmacokineticists to determine appropriate dosage regimens without comprehensive pharmacokinetic data from animal or human studies. One prevalent assumption is setting the bioavailability factor, denoted as F, to 1 or 100%. This assumption caters to the scenario where a drug doesn't achieve full systemic absorption, resulting in the patient...
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Terbutaline pharmacokinetics in cows: preliminary data.

Melanie J Boileau1, Kevin E Washburn, Cyril R Clarke

  • 1Department of Veterinary Clinical Sciences, Oklahoma State University Center for Veterinary Health Sciences, College of Veterinary Medicine, 1 BVMTH, Stillwater, Oklahoma 74078, USA. melanie.boileau@okstate.edu

Canadian Journal of Veterinary Research = Revue Canadienne De Recherche Veterinaire
|December 30, 2006
PubMed
Summary

This study investigated terbutaline pharmacokinetics in cows. Terbutaline was rapidly eliminated from the bloodstream after intravenous administration in cattle.

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Area of Science:

  • Veterinary Pharmacology
  • Animal Science
  • Drug Metabolism

Background:

  • Terbutaline is a beta-agonist used in human medicine.
  • Its pharmacokinetics in cattle, particularly post-parturition, are not well-established.
  • Understanding drug behavior in cattle is crucial for effective treatment.

Purpose of the Study:

  • To determine the serum pharmacokinetics of terbutaline in healthy cows.
  • To evaluate terbutaline's elimination profile after intravenous administration at different doses.
  • To establish reference pharmacokinetic parameters for terbutaline in cattle.

Main Methods:

  • Intravenous administration of terbutaline (5 microg/kg and 0.5 mg/kg) to near-term pregnant beef cows post-parturition.
  • Serum samples collected at various time points post-administration.
  • Terbutaline concentrations quantified using high-performance liquid chromatography with fluorescence detection (HPLC-FLD).

Main Results:

  • Terbutaline exhibited rapid elimination from the bloodstream in cattle.
  • Peak serum concentration (Cmax) was 708.22 ng/mL at the 0.5 mg/kg dose.
  • Half-life (t1/2) was 6.93 minutes, and residence time (MRT) was 6.75 minutes.
  • Serum concentrations fell below the limit of detection within 30 minutes post-administration.

Conclusions:

  • Terbutaline is quickly eliminated following intravenous administration in cattle.
  • The drug's rapid clearance suggests limited systemic accumulation.
  • Further research may explore alternative administration routes or formulations for sustained effects in cattle.