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Combined Effects of Drugs: Antagonism01:30

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The combined effects of drugs can result in various interactions, of which an important type is antagonism. Antagonism is a mechanism where one drug inhibits or counteracts the effects of another drug. Antagonism can occur through various means, including receptor binding, allosteric modulation, functional interaction, chemical reactions, and pharmacokinetic processes.
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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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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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Pharmacokinetics: Drug–Drug Interactions01:25

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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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Pharmacokinetics: Drug–Food and Drug–Viral Interactions01:26

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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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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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Evaluation of drug interaction microcomputer software: comparative study.

T I Poirier1, R Giudici

  • 1St. Francis Medical Center, Pittsburgh, PA 15201.

Hospital Pharmacy
|January 1, 1991
PubMed
Summary

This study evaluates twelve drug interaction software programs, comparing their features and performance. It recommends ideal programs across different price points for healthcare professionals.

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Area of Science:

  • Pharmacology
  • Health Informatics
  • Clinical Pharmacy

Background:

  • Drug interactions pose significant risks in patient care.
  • Accurate and accessible drug interaction information is crucial for safe prescribing.
  • Microcomputer software offers a practical solution for managing drug interaction data.

Purpose of the Study:

  • To evaluate and compare twelve available drug interaction microcomputer software programs.
  • To identify the strengths and weaknesses of each evaluated software.
  • To define the features of an ideal drug interaction software program.

Main Methods:

  • A comprehensive evaluation of twelve drug interaction software programs.
  • Comparison based on general and specific criteria relevant to clinical use.
  • Analysis of features, user ratings, advantages, and disadvantages.

Main Results:

  • Detailed comparison of features, ratings, pros, and cons for each of the twelve programs.
  • Identification of key characteristics that define a superior drug interaction software.
  • Categorization of software recommendations based on three distinct price ranges.

Conclusions:

  • Several drug interaction software programs offer valuable clinical support.
  • The selection of appropriate software depends on specific user needs and budget.
  • An ideal program should balance comprehensive data with user-friendly interface and affordability.