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Related Concept Videos

Dose-Response Relationship: Potency and Efficacy01:22

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The potency of a drug is the measure of its ability to produce a biological response and can be compared by looking at the half-maximum effective concentration or EC50 values of different drugs. A lower EC50 value indicates higher potency of the drug. In the dose–response curve of two antihypertensive drugs, candesartan and irbesartan, a significant difference is observed in their EC50 values. A lower EC50 value for candesartan indicates that it is more potent than irbesartan, as it...
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Dose-Response Relationship: Overview01:03

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Agonists can bind with and activate receptors, resulting in the formation of drug-receptor complexes. Once formed, these complexes catalyze many biochemical processes at the cellular level and subsequently induce a pharmacologic response. The degree of response is directly proportional to the fraction of activated receptors, which in turn, depends on the concentration of the drug at the receptor site as well as the sensitivity of the receptor. An increase in the administered dose contributes to...
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Dose Response Curve: Conventional Versus Nonmonotonic01:21

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The correlation between a drug's dosage and its impact on a biological system is a cornerstone of pharmacology and toxicology. Conventional dose–response curves, which include graded and quantal relationships, are key to this understanding. Graded dose–response curves depict the spectrum of a biological reaction to different doses within an individual, indicating that as the drug dosage increases, so does the intensity of the response. On the other hand, quantal dose–response...
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Dose-Response Relationship: Selectivity and Specificity01:25

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Drugs exert their therapeutic effects by interacting with receptors, enzymes, or ion channels that are present throughout the human body. The strength and duration of the interaction between a drug and its target receptor are characterized by the selectivity and specificity of the drug. Selectivity refers to a drug's strong preference for its intended target over other targets. For instance, isoprenaline, a non-selective β-adrenergic agonist, interacts with both β1- and...
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Pharmacokinetic–Pharmacodynamic Relationship: Intensity of Dose-Effect Relationship01:23

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Pharmacodynamics explores the relationship between drug concentration and its effect. In a quantal response drug, the duration of action better correlates with drug concentration, while for graded effect drugs, the intensity of response is more relevant. This intensity depends on the dose, drug removal rate, and the region of the concentration–response curve.The concentration–response curve can be divided into three regions. Region 3 (80–100% maximum response) demonstrates...
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Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship01:14

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For drugs producing a quantal response, onset occurs when plasma concentration reaches a minimum effective level (Cmin). The drug's action duration depends on how long the plasma concentration remains above Cmin.Two primary factors influence this duration: dose size and the rate of drug removal from the action site. Both depend on the drug's redistribution to poorly perfused tissues and elimination processes. A larger dose promotes rapid onset and prolongs the effect's duration.Consider a...
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High Content Screening Analysis to Evaluate the Toxicological Effects of Harmful and Potentially Harmful Constituents HPHC
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The H-ARS Dose Response Relationship (DRR): Validation and Variables.

P Artur Plett1, Carol H Sampson, Hui Lin Chua

  • 1*Indiana University School of Medicine, Indianapolis, IN; †Statistician, Rockville, MD; ‡University of Maryland School of Medicine, Baltimore, MD.

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PubMed
Summary
This summary is machine-generated.

Stressful medical countermeasure administration schedules in irradiated mice negatively impact survival. Dosing regimens must be considered when constructing radiation dose lethality response relationships for survival studies.

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Area of Science:

  • Radiation biology
  • Animal models
  • Pharmacology

Background:

  • Laboratory procedures on irradiated animals can induce stress, affecting survival.
  • Hematopoietic acute radiation syndrome (HARS) is a critical area of study.

Purpose of the Study:

  • To investigate the impact of varying medical countermeasure (MCM) administration schedules on survival in a murine model of HARS.
  • To determine if stress from MCM administration affects radiation dose-response relationships.

Main Methods:

  • 20 survival efficacy studies were grouped by MCM administration severity (Admn 1-3).
  • Radiation doses ranged from LD30/30 to LD95/30.
  • Radiation dose lethality response relationship (DRR) probit plots and Kaplan-Meier survival curves were analyzed.

Main Results:

  • The Admn 3 group (frequent injections/gavages) showed a significantly steeper probit slope (5.190) compared to controls (2.842).
  • The LD50/30 for Admn 3 (8.43 Gy) was significantly lower than the original DRR (8.53 Gy).
  • Kaplan-Meier survival analysis revealed significantly worse survival in Admn 3 mice (p = 0.007).

Conclusions:

  • Stressful MCM administration schedules negatively impact survival in irradiated mice.
  • Dosing regimens and administration stress are critical factors to consider when developing radiation dose-response relationships for survival studies.