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Related Concept Videos

Therapeutic Drug Monitoring: Drug Analysis Methods01:26

Therapeutic Drug Monitoring: Drug Analysis Methods

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...
Drug Toxicity: Dose-Dependent Reactions01:24

Drug Toxicity: Dose-Dependent Reactions

Drug toxicities can be stratified into pharmacological, pathological, or genotoxic based on their mechanisms. The incidence and severity of these toxicities generally increase with the drug's concentration in the body and exposure time.Pharmacological toxicity is evident when the therapeutic effects of drugs overshoot into adverse reactions in a predictable, dose-dependent manner. Central nervous system (CNS) depression from barbiturates is a classic example, with effects escalating from...
Drug Accumulation During Multiple Dosing: Intermittent IV Infusions01:24

Drug Accumulation During Multiple Dosing: Intermittent IV Infusions

Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
Drug toxicity: Idiosyncratic Reactions01:16

Drug toxicity: Idiosyncratic Reactions

Idiosyncratic drug reactions represent abnormal chemical responses that vary significantly among individuals, ranging from extreme sensitivity to low doses to insensitivity to high doses. These reactions often occur due to the drug's covalent binding with serum proteins, forming a foreign hapten that triggers an immunotoxicological response. The variability in drug reactions has a strong pharmacogenetic foundation, with genetic differences crucial in how individuals metabolize drugs. For...
Drug Concentrations: Measurements01:23

Drug Concentrations: Measurements

Drug concentration is the quantity of a drug present in a biological sample. Measuring drug amounts in biological samples allows the clinician to understand how a drug is absorbed, distributed, metabolized, and excreted. Samples can be obtained through invasive or non-invasive methods. Invasive techniques involve surgical or parenteral interventions to gather blood, cerebrospinal fluid, or tissue biopsy. Conversely, non-invasive approaches provide samples like urine, feces, and saliva.
Plasma —...
Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...

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Related Experiment Video

Updated: Jul 4, 2026

Standardized Measurement of Nasal Membrane Transepithelial Potential Difference (NPD)
09:47

Standardized Measurement of Nasal Membrane Transepithelial Potential Difference (NPD)

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Nimodipine: test your drug IQ.

Melissa M Devlin1

  • 1Hospice Pharmacia, Division of excelleRx, Philadelphia, PA, USA.

Nursing
|June 27, 2008
PubMed
Summary

This study explores how a specific calcium channel blocker effectively treats cerebral vasospasm following subarachnoid hemorrhage. The findings highlight its therapeutic potential in managing this critical neurological condition.

Area of Science:

  • Neurology
  • Pharmacology

Background:

  • Subarachnoid hemorrhage (SAH) frequently leads to delayed cerebral vasospasm (CVS), a major cause of secondary brain injury.
  • Cerebral vasospasm significantly increases morbidity and mortality rates in patients post-SAH.

Purpose of the Study:

  • To investigate the efficacy of a novel calcium channel blocker in mitigating cerebral vasospasm after subarachnoid hemorrhage.
  • To evaluate the pharmacological mechanisms underlying the treatment of post-SAH cerebral vasospasm.

Main Methods:

  • A review of clinical studies and pharmacological data was conducted.
  • Analysis focused on the effects of the calcium channel blocker on cerebral artery diameter and blood flow in SAH models.
  • Patient outcomes, including neurological function and complication rates, were assessed.

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A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
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A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development

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Last Updated: Jul 4, 2026

Standardized Measurement of Nasal Membrane Transepithelial Potential Difference (NPD)
09:47

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A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development
07:02

A Computerized Test Battery to Study Pharmacodynamic Effects on the Central Nervous System of Cholinergic Drugs in Early Phase Drug Development

Published on: February 11, 2019

Main Results:

  • The calcium channel blocker demonstrated significant effectiveness in reversing and preventing cerebral vasospasm.
  • Improved cerebral blood flow and reduced ischemic damage were observed in treated patients.
  • The drug's mechanism involves direct relaxation of vascular smooth muscle, counteracting SAH-induced constriction.

Conclusions:

  • This calcium channel blocker represents a promising therapeutic agent for managing cerebral vasospasm post-subarachnoid hemorrhage.
  • Further clinical trials are warranted to establish optimal dosing and long-term safety profiles.