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Related Concept Videos

Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
Several...
Kinetics of Drug Elimination01:17

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Eliminating drugs from the body is a vital process that occurs through excretion or metabolism. Understanding the kinetics of drug elimination is crucial for drug development, dosage determination, and optimizing patient outcomes.
Drug clearance depends on the rate of drug elimination and its plasma concentration. Another important parameter is the half-life of a drug, which is the time required for its concentration to decrease by half. In most cases, drug clearance follows first-order...
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Factors Influencing Drug Absorption: Drug Dissolution

The pharmacokinetic journey of drugs from solid oral dosage forms into systemic circulation is multifaceted. It begins with disintegration, a prerequisite ensuring a solid dosage form's subdivision into minute particles. Dissolution occurs next as these granulated entities solubilize in gastrointestinal fluids. This solubilization is crucial for the succeeding stage, permeation, which describes the traversal of the drug across the intestinal membrane and its subsequent entry into the blood...
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Prescription drugs require a prescription from a medical practitioner and can only be obtained from a pharmacy. They have many applications, including treating pain, anxiety, and hypertension.
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Drug Elimination by Renal Route: Tubular Reabsorption

During the process of renal excretion, as the glomerular filtrate progresses to the distal convoluted tubule (DCT), drugs that are highly permeable, lipophilic, and nonionized undergo passive reabsorption from the tubular fluid into the surrounding peritubular capillaries. This reabsorption process restricts their elimination through the kidneys. However, the majority of drugs are either weak acids or weak bases, and their ionization level is dependent on pH. By altering the pH of urine, the...
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Orally administered drugs primarily enter the systemic circulation via passive diffusion through the intestinal membranes. The drug's absorption is influenced by drug stability in the gastrointestinal GI tract, membrane permeability, the surface area available for absorption, luminal drug concentration, and residence time in the lumen. Drug permeability can be enhanced by adjusting the lipophilicity, polarity, or molecular size of the drug, promoting its passive transport across intestinal...

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Color Spot Test As a Presumptive Tool for the Rapid Detection of Synthetic Cathinones
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Published on: February 5, 2018

[Why do good drugs disappear?].

Mayer Brezis1, Ron Tomer, Samuel Klang

  • 1Center for Clinical Quality & Safety, Hadassah Hebrew University Medical Hospital, Jerusalem, Israel. brezis@vms.huji.ac.il

Harefuah
|May 17, 2011
PubMed
Summary

Essential old medications are vanishing from the market, increasing healthcare costs and introducing safety uncertainties. Systemic revisions are crucial to ensure the continued availability of these safe and effective drugs.

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Area of Science:

  • Pharmacology
  • Health Economics
  • Regulatory Affairs

Context:

  • Established medications with proven safety and efficacy profiles are increasingly unavailable.
  • Examples include nitrofurantoin for urinary tract infections, alpha-methyldopa and hydralazine for pregnancy hypertension, and chlorthalidone for hypertension.
  • The withdrawal of these drugs necessitates transitions to newer agents, often at higher costs and with less established long-term safety data.

Purpose:

  • To highlight the issue of essential old drug unavailability.
  • To identify the contributing factors, including market failures and regulatory process deficiencies.
  • To advocate for systemic revisions to ensure the continued availability of safe and effective older medications.

Summary:

  • Old drugs with demonstrated efficacy and safety are disappearing from the market.
  • This trend impacts treatments for urinary tract infections, pregnancy hypertension, and general hypertension.
  • Reasons include market failures and production/regulatory issues, leading to increased costs and safety uncertainties with newer alternatives.

Impact:

  • Increased healthcare costs due to reliance on newer, more expensive medications.
  • Potential risks associated with the uncertainty of safety and efficacy of alternative drugs.
  • Urgent need for regulatory and market system reforms to preserve access to essential, cost-effective medicines.