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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 rational dosage regimen considers a drug's pharmacokinetics, including its absorption, distribution, metabolism, and elimination from the body. By understanding these factors, the appropriate dosage can be determined, and the dosing schedule can be designed to achieve and maintain the desired therapeutic effect while minimizing adverse effects.
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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 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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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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In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
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Recommendations on dose level selection for repeat dose toxicity studies.

Fiona Sewell1, Marco Corvaro2, Amanda Andrus3

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This summary is machine-generated.

Selecting appropriate doses in animal safety testing is crucial for regulatory approval. This study proposes harmonized, scientifically advanced methods for dose selection, prioritizing animal welfare and human health risk assessment.

Keywords:
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Area of Science:

  • Toxicology
  • Regulatory Science
  • Risk Assessment

Background:

  • Manufacturers require safety data for product registration.
  • Repeat-dose animal studies are key for human health risk assessments.
  • Current dose selection guidance lacks harmonization, especially for the highest dose.

Purpose of the Study:

  • To recommend pragmatic approaches for dose level selection in safety studies.
  • To harmonize dose selection considering regulatory, animal welfare, and scientific factors.
  • To improve the relevance of safety testing for human health risk assessment.

Main Methods:

  • Building on ECETOC technical report recommendations.
  • Considering sector-specific regulatory requirements and study purposes.
  • Utilizing toxicokinetic data and existing toxicity endpoints.

Main Results:

  • Dose selection approaches vary by industry sector and regulatory context.
  • Systemic exposure understanding should guide dose selection.
  • The highest dose should induce minimal toxicity without compromising animal well-being.

Conclusions:

  • Harmonized dose selection is essential for robust safety assessments.
  • Integrating toxicokinetics and existing data improves dose selection.
  • Advancements in predictive human exposure will enable more human-relevant dose selection strategies.