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Related Concept Videos

Pharmacokinetics: Drug–Drug Interactions01:25

Pharmacokinetics: Drug–Drug Interactions

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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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Standard Precaution01:26

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Standard precautions are the minimum infection control safeguards used while caring for all patients, irrespective of their disease condition. They help prevent the spread of common infectious microorganisms to healthcare workers, patients, and visitors in all healthcare settings.
Hand hygiene is the most crucial means to prevent the transmission of disease. Employers are legally required to provide their workers with personal protective equipment (PPE) to minimize exposure or contact with...
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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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Effect of Hepatic Disease on Pharmacokinetics: Dose Adjustments Due to Hepatic Impairment01:08

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Hepatic impairment, characterized by decreased liver function, does not uniformly mandate adjustments in drug dosage. Whether dosage modifications are necessary depends on various factors related to the drug's metabolism and elimination pathways. If a drug is primarily excreted via the kidneys and bypasses significant hepatic processing, if it undergoes minimal metabolic transformation in the liver, or if it is volatile and primarily expelled through the lungs, dose adjustments may not be...
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Therapeutic Index01:13

Therapeutic Index

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The therapeutic index of a drug is a key parameter in pharmacology that quantifies the relative safety of a drug by calculating the ratio between the dose that causes toxicity in half the population (50%) to the dose that proves to be effective for half the population (50%). It provides a spectrum of doses for a particular drug ranging from effective to potentially toxic. To illustrate, consider an anticoagulant agent like warfarin. It possesses a narrow window within its therapeutic index to...
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Prescription, Nonprescription and Orphan Drugs01:02

Prescription, Nonprescription and Orphan Drugs

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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.
The misuse and addiction to prescription drugs is a growing problem that can affect people of all age groups, specifically teenagers. This can happen when prescription medications are used in ways not intended by the prescriber, such as taking someone else's prescription or using medication for...
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Updated: Nov 18, 2025

Chinese Herbal Retention Enema for the Treatment of Ulcerative Colitis
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Herbal Supplements: Precautions and Safe Use.

Christopher Ty Williams1

  • 1School of Nursing, Vanderbilt University, 461 21st Avenue South, Nashville, TN 37240, USA.

The Nursing Clinics of North America
|February 7, 2021
PubMed
Summary
This summary is machine-generated.

Herbal supplements lack strict FDA drug approval, posing risks due to limited evidence and potential adverse reactions or drug interactions. This review covers 20 common supplements, offering precautions and resources.

Keywords:
BotanicalsHerbal medicineHerbal supplementsHerbal-drug interactionsPrecautionsSafe use

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Area of Science:

  • Pharmacology
  • Nutritional Science
  • Regulatory Affairs

Background:

  • Herbal preparations are classified as food supplements by the FDA, bypassing rigorous drug approval processes.
  • The FDA's oversight focuses on preventing adulterated or misbranded products, with less defined safe practice regulations.
  • Limited scientific evidence exists for many herbal supplements, raising concerns about efficacy and safety.

Purpose of the Study:

  • To review scientific evidence and safety information for common herbal supplements.
  • To highlight potential adverse reactions and drug-herb interactions.
  • To provide resources for consumers and healthcare professionals regarding herbal supplement use.

Main Methods:

  • Review of scientific literature on herbal supplements.
  • Analysis of FDA regulations pertaining to food supplements.
  • Compilation of information on 20 common herbal supplements, including St. John's wort, ginseng, echinacea, and ginkgo.

Main Results:

  • Herbal supplements are not subject to premarket approval, unlike pharmaceutical drugs.
  • Scientific evidence supporting the safety and efficacy of many herbal supplements is limited.
  • Adverse reactions and interactions with conventional drugs are associated with herbal supplement use.

Conclusions:

  • Consumers and healthcare professionals should exercise caution with herbal supplements due to regulatory gaps and limited evidence.
  • Awareness of potential risks, including adverse effects and drug interactions, is crucial.
  • Further research and clear guidelines are needed to ensure the safe use of herbal supplements.