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Related Concept Videos

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response01:15

Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response

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Circadian rhythms are cyclic changes that are crucial in plasma drug concentrations. Various standard circadian parameters, including core body temperature, heart rate, and other cardiovascular factors, directly impact disease states and the therapeutic response to drug therapy.
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
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Dosage Interval and Administration Route: Determination Methods01:19

Dosage Interval and Administration Route: Determination Methods

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A medication’s effectiveness largely depends on its appropriate dosage and the route of administration. Dosage ensures that a sufficient drug concentration is maintained in the bloodstream to elicit the desired therapeutic effect without causing toxicity. The route of administration affects the drug's bioavailability, rate of absorption, and onset of action, which are crucial for achieving optimal therapeutic outcomes. Drug dosage calculations are critical to tailoring therapy to...
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Dosage Regimen: Fixed Dose01:01

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Fixed-dose regimens are a common approach to administer drugs to achieve and maintain desired levels of the drug in the body. In this dosing strategy, a specific amount of medication is given at regular intervals, often multiple times a day, to ensure a consistent drug concentration in the bloodstream.
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A drug dosage regimen describes the specific instructions and schedule for administering a drug to a patient. It considers factors such as drug dosage, frequency, route of administration, and duration of treatment. Designing an appropriate dosage regimen for a patient aims to achieve a target drug concentration at the site of action.
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Understanding how a drug's concentration fluctuates within the body over time is crucial in pharmacokinetics, particularly with multiple oral doses. A graphical representation of multiple oral dosages provides insight into these dynamics. Typical accumulation curves of a drug's concentration in the body reveal a sawtooth pattern, indicating periodic peaks and troughs correlating with each dose administration and the drug's subsequent elimination.The plasma concentration at any time during an...
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Chronopharmacokinetics: Time-Dependent Pharmacokinetics01:20

Chronopharmacokinetics: Time-Dependent Pharmacokinetics

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Related Experiment Video

Updated: Mar 28, 2026

Technical Aspect of the Automated Synthesis and Real-Time Kinetic Evaluation of [11C]SNAP-7941
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[What is the correct time to take medication?].

Niels P Riksen1, David M Burger

  • 1Radboudumc, Nijmegen.

Nederlands Tijdschrift Voor Geneeskunde
|December 18, 2015
PubMed
Summary

Time significantly impacts drug efficacy and dosing. Understanding pharmacokinetics and pharmacodynamics, including steady-state and chronotherapy, is crucial for optimal patient treatment.

Area of Science:

  • Pharmacology
  • Internal Medicine
  • Vascular Medicine

Background:

  • Time is a critical factor in clinical practice for pharmacists and physicians.
  • Drug dosage recommendations rely on pharmacokinetic parameters like elimination half-life.
  • Drug level monitoring is most useful after achieving the steady-state phase.

Purpose of the Study:

  • To illustrate the importance of time in daily clinical activities.
  • To highlight the role of time in pharmacokinetics and pharmacodynamics.
  • To showcase the application of time-dependent drug administration strategies.

Main Methods:

  • Review of daily activities of a hospital pharmacist/clinical pharmacologist and an internist/vascular medicine specialist.
  • Analysis of time-dependent factors in drug dosing and administration.

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  • Consideration of pharmacodynamic time effects, such as chronotherapy.

    • Main Results:

    • Elimination half-life dictates dosage timing and steady-state achievement.
    • Pharmacodynamic effects vary with administration time, impacting drug efficacy.
    • Specific cardiovascular drugs demonstrate time-dependent therapeutic benefits.

    Conclusions:

    • Integrating time-based considerations into clinical practice optimizes drug therapy.
    • Understanding chronopharmacology enhances patient outcomes.
    • Time is an indispensable element in effective medication management and vascular medicine.