Select the most accurate description of a phase 1 clinical trial.
Adverse effects of a drug are monitored after the drug is approved by the FDA.
The drug is administered to a small number of healthy volunteers to determine its safety.
The drug's effects are compared to a placebo to determine its effectiveness.
The drug is administered to a large number of patients to assess effectiveness.
The Correct Answer is B
A. Adverse effects of a drug are monitored after the drug is approved by the FDA: This describes a phase IV clinical trial, also known as post-marketing surveillance, where long-term safety and rare side effects are evaluated after public release.
B. The drug is administered to a small number of healthy volunteers to determine its safety: Phase I clinical trials primarily assess the drug’s safety, tolerability, pharmacokinetics, and dosage range. These studies usually involve a small group of healthy participants to identify potential side effects and establish safe dosing parameters.
C. The drug’s effects are compared to a placebo to determine its effectiveness: This is characteristic of a phase III clinical trial, where a large sample of patients receives the investigational drug or placebo to evaluate its efficacy and compare it to standard treatments.
D. The drug is administered to a large number of patients to assess effectiveness: Phase II and III trials focus on assessing effectiveness, with phase III involving the largest sample sizes. Phase I, however, emphasizes safety and dosage testing, not broad patient efficacy.
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Related Questions
Correct Answer is B
Explanation
A. The process of a drug's movement within the bloodstream and into various tissues: This describes pharmacokinetics, specifically the distribution phase, which focuses on how a drug travels through the body, not how it produces its effects.
B. The biochemical and physiologic effects of a drug after interacting with a receptor: Pharmacodynamics is concerned with what the drug does to the body, including receptor binding, mechanism of action, and resulting therapeutic or adverse effects.
C. The enzymatic breakdown of drugs usually involving specific enzymatic processes: This refers to drug metabolism, a pharmacokinetic process, often occurring in the liver, which helps prepare drugs for elimination from the body.
D. The process of removing a drug from the body, usually involving the liver and kidneys: This describes drug excretion, another pharmacokinetic process, where drugs and metabolites are eliminated, mainly via renal or biliary pathways.
Correct Answer is ["A","C","D"]
Explanation
A. Genetics: Genetic variations can alter enzyme activity responsible for drug metabolism, such as differences in cytochrome P450 enzyme expression. These variations may cause drugs to be metabolized too quickly or too slowly, impacting both therapeutic effectiveness and risk of toxicity.
B. Drug-protein binding: Protein binding affects drug distribution, not metabolism. Highly protein-bound drugs may have altered bioavailability, but their rate of chemical breakdown in the liver is determined by metabolic enzyme activity rather than binding to plasma proteins.
C. Liver health: The liver is the primary organ for drug metabolism. Conditions such as hepatitis, cirrhosis, or fatty liver disease reduce enzymatic activity, slowing drug clearance and increasing the potential for drug accumulation and toxicity.
D. Client age: Age significantly influences metabolism because newborns have immature hepatic enzyme systems, while older adults experience reduced liver mass and blood flow. These changes can alter how quickly or effectively drugs are metabolized.
E. Dosing frequency: The frequency of dosing affects plasma concentration and steady-state levels but does not directly influence the body’s ability to metabolize drugs. Metabolic capacity is determined by enzymatic and physiological factors, not by how often a drug is administered.
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