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Related Concept Videos

Clinical Trials: Overview01:11

Clinical Trials: Overview

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Clinical development focuses on how the drug will interact with the human body and encompasses four key phases of clinical trials, each serving a specific purpose in assessing the safety and effectiveness of new drugs. These phases overlap and build upon one another. Phase I involves a small group of healthy volunteers (typically 20-80 individuals) or, in cases where significant toxicity is expected, patients with the targeted disease, such as cancer or AIDS. The volunteers are tested for...
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Bioequivalence of Drugs: Drugs with Multiple Indications01:09

Bioequivalence of Drugs: Drugs with Multiple Indications

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The concept of therapeutic equivalence (TE) in drugs with multiple indications is complex. A generic drug may be therapeutically equivalent to a brand-name product for one specific indication, but this doesn't necessarily mean it's equivalent for all other indications. Evidence of TE in one patient group and bioequivalence shown in healthy volunteers can support—but not confirm—TE for other indications. However, definitive proof requires individual clinical studies for each...
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Clinical Trials01:16

Clinical Trials

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Clinical trials are prospective experimental studies conducted on humans to determine the safety and efficacy of treatments, drugs, diet methods, and medical devices. Using statistics in clinical trials enables researchers to derive reasonable and accurate conclusions from the collected data, allowing them to make wise decisions in uncertain situations. In medical research, statistical methods are crucial for preventing errors and bias.
There are four phases in a clinical trial. A phase one...
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Preclinical Development: Overview01:28

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Preclinical development consists of a series of tests that ensure the safety and efficacy of a new therapeutic compound before it is tested in humans. There are four main phases to this process. First, safety pharmacology tests are conducted to ensure the drug does not produce any acutely harmful effects. These tests examine parameters such as bronchoconstriction, cardiac dysrhythmias, blood pressure changes, and ataxia. Next, preliminary toxicological testing is performed to determine the...
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Therapeutic Drug Monitoring: Drug Analysis Methods01:26

Therapeutic Drug Monitoring: Drug Analysis Methods

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Therapeutic Drug Monitoring (TDM) is a clinical practice that measures specific drug levels in a patient's blood or body tissues to tailor drug therapy effectively. This monitoring is critical for managing drugs with narrow therapeutic indices like digoxin and phenytoin, ensuring they are both safe and effective. For instance, monitoring theophylline levels in asthma patients involves precision and sensitivity to adjust doses according to individual responses to therapy, ensuring efficacy and...
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Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

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Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
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Genomic Evidence on Antihypertensive Drug Targets and Oral Disease Outcomes.

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Related Experiment Video

Updated: Mar 19, 2026

Utilizing an Orally Dissolving Strip for Pharmacological and Toxicological Studies: A Simple and Humane Alternative to Oral Gavage for Animals
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Target Trial Emulation to Assess Oral Drug Safety.

I Leiva-Escobar1, A Puzhakkara Chennas1, S L Reckelkamm1,2

  • 1Institute of Health Services Research in Dentistry, University of Münster, Münster, Germany.

Journal of Dental Research
|March 18, 2026
PubMed
Summary
This summary is machine-generated.

Target trial emulation (TTE) using real-world data found no significant 5-year risk of dental caries with thiazide monotherapy compared to nonthiazide use. Naïve cohorts showed biased results, highlighting TTE

Keywords:
antihypertensive agentscausalitydental cariesdrug-related side effects and adverse reactionselectronic health recordsobservational studies as topic

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Area of Science:

  • Observational studies and epidemiology
  • Pharmacoepidemiology
  • Health informatics

Background:

  • Randomized controlled trials (RCTs) are ideal for causal inference but often infeasible or unrepresentative.
  • Observational studies offer real-world insights but are prone to bias.
  • Target trial emulation (TTE) is a framework to minimize bias in observational studies using real-world data.

Purpose of the Study:

  • To assess the 5-year effect of thiazide monotherapy on dental caries risk using TTE.
  • To compare the performance of TTE against traditional naïve cohort designs.

Main Methods:

  • Applied TTE framework with an active comparator new user design using electronic health records.
  • Compared thiazide versus nonthiazide monotherapy.
  • Developed prevalent user and nonaligned cohorts to illustrate bias.

Main Results:

  • TTE cohort: No significant difference in 5-year dental caries risk (Risk Difference: 0.29%, 95% CI: -0.36% to 0.95%).
  • Prevalent user cohort: Showed a positive association (Risk Difference: 0.65%, 95% CI: 0.22% to 1.09%).
  • Nonaligned cohort: Showed a negative association (Risk Difference: -0.24%, 95% CI: -0.55% to 0.07%).

Conclusions:

  • TTE effectively minimizes design-related biases common in observational research.
  • Thiazide monotherapy does not significantly increase the 5-year risk of dental caries.
  • TTE enables robust causal inference from real-world data for oral health research.