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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
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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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Drug interactions occur when the pharmacological effect of one drug is altered by another substance, either enhancing or diminishing its activity. The drug whose activity is altered is known as the object drug, and the substance causing the alteration is called the agent drug or the precipitant. The net effects of these interactions are mostly undesirable, leading to decreased effectiveness or increased adverse effects. In rare cases, interactions can be beneficial, such as the enhanced...
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A drug interaction occurs when the concurrent use of another drug, food, or an external substance alters the pharmacological activity of a drug. This interaction can modify the action of the original drug, affecting its effectiveness and safety.Drug–food interactions are significant as they impact drug absorption, metabolism, and excretion. For example, grapefruit juice is a well-known disruptor of drug metabolism. It inhibits the cytochrome P450 3A4 enzyme, crucial for the metabolism of...
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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...
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Drug toxicity: Drug–Drug Interaction01:30

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Drug–drug interactions can precipitate toxicity through multiple mechanisms. Absorption interactions alter how drugs enter the body, exemplified when ranitidine increases the absorption of basic drugs, while cholestyramine decreases the levels of propranolol. Protein binding interactions occur when drugs share the same binding sites on plasma proteins. Drugs like aspirin and warfarin, when bound in excess, can lead to increased free drug concentrations, enhancing the potential for...
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Drug interaction microcomputer software evaluation: PDR's drug interactions and side effects diskettes.

T I Poirier1, R A Giudici

  • 1Duquesne University, Pittsburgh, PA 15201.

Hospital Pharmacy
|September 1, 1990
PubMed
Summary

This evaluation found the PDR

Area of Science:

  • Pharmacology
  • Medical Informatics

Background:

  • The PDR's Drug Interactions and Side Effects System is a tool used in clinical practice.
  • Evaluating such systems is crucial for ensuring reliable drug information.
  • Previous assessments of drug interaction databases may not have focused on this specific PDR system.

Purpose of the Study:

  • To evaluate the PDR's Drug Interactions and Side Effects System.
  • To assess its performance based on general and specific criteria relevant to clinical use.

Main Methods:

  • The evaluation utilized a set of general and specific criteria.
  • Key aspects assessed included installation, usability, documentation, technical support, clinical documentation quality, scope of coverage, clinical performance, and update frequency.

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Main Results:

  • Installation, ease of learning, and ease of use were rated excellent.
  • User documentation and technical support were rated good.
  • Clinical documentation quality, scope of coverage, and overall clinical performance were rated fair.
  • Update frequency was rated good.

Conclusions:

  • The PDR system excels in usability and provides good support and update frequency.
  • However, its clinical documentation quality and coverage are fair, lacking evaluative information and potentially outdated content.
  • The system's primary strength is referencing official product labeling, but limitations exist regarding comprehensiveness and currency.