What is the focus of preclinical testing?

Assess safety in animals and labs

What occurs in Phase III clinical trials?

Large patient group, Evaluate safety/efficacy, Compare to existing treatments

Which concepts apply to spare receptors?

Extra receptors exist, Explains low antagonist effect, Not all receptors needed for max response

What does pharmacovigilance involve?

Analyzing population reactions, Monitoring ADRs

What does therapeutic range indicate?

Narrow range needs monitoring, Min toxicity levels, Effective drug plasma levels

What are characteristics of graded dose-response curves?

Sigmoidal shape, Represent individual response, Show EC₅₀

What are parts of drug discovery?

Test lead safety, Find a lead compound, Optimize structure

Which are uses of quantal dose-response curves?

Determine TD₅₀, Calculate LD₅₀, Determine ED₅₀

What does a small therapeutic index imply?

Narrow safety margin, Requires close monitoring

What is the purpose of post-marketing surveillance?

Monitor long-term safety and rare side effects

What happens with a competitive antagonist?

Dose-response curve shifts right

How does an inverse agonist work?

Reduces baseline receptor activity

Which are examples of post-marketing surveillance?

Detect rare side effects, Monitor long-term safety

What are characteristics of a partial agonist?

Produces weaker response, Binds to receptors

What happens after a drug is approved?

Post-marketing surveillance starts

What happens at ED₅₀ in quantal curves?

50% achieve therapeutic response

What does ED₅₀ represent?

Dose for 50% therapeutic effect

What is an outcome of pharmacodynamic interactions?

Additive or counteractive effects

How does Activation-Aggregation theory define inverse agonists?

Shifts receptors to inactive state

What is an example of a pharmacodynamic interaction?

Two sedatives increase sedation

What are true of competitive antagonists?

Shifts dose–response curve, Increases required agonist dose, Reversibly binds agonist site

Which drug action is defined by Macromolecular Perturbation Theory?

Agonists induce productive shape change

What is a characteristic of pharmacokinetic interactions?

Drugs affect each other's metabolism

Which are effects of a partial agonist?

Less than max response, Reduces full agonist effect, Partially activates receptors

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pharmacology pharmacodynamic 1

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Questions 100

Answers

1
How is the therapeutic range best defined?
Range of safe plasma levels
Range for receptor saturation
Range for max efficacy
Range for toxic response
2
What is the focus of preclinical testing?
Test market readiness
Submit regulatory application
Assess safety in humans
Assess safety in animals and labs
3
What does Macromolecular Perturbation Theory emphasize?
Nonproductive receptor perturbations
Combines Rate and Induced Fit
Receptors oscillating states
Response ∝ binding shape change
4
What occurs in Phase III clinical trials?
Animal safety testing
Large patient group
Evaluate safety/efficacy
Compare to existing treatments
5
What is the main outcome of noncompetitive antagonists?
Reduces maximum efficacy
Increases receptor activity
Shifts curve leftward
Blocks partial agonists
6
Which concepts apply to spare receptors?
Seen in quantal curves
Extra receptors exist
Explains low antagonist effect
Not all receptors needed for max response
7
What does pharmacovigilance involve?
Analyzing population reactions
Monitoring ADRs
Predicting adverse effects
Preventing all side effects
8
What does TD₅₀ represent?
Dose causing 50% toxicity
Dose causing 50% therapeutic effect
Dose for max response
Dose for 50% lethal effect
9
What does therapeutic range indicate?
Narrow range needs monitoring
Min toxicity levels
Max receptor occupancy
Effective drug plasma levels
10
What is the role of pharmacovigilance?
Monitoring ADRs
Improving potency
Predicting dose-response curves
Blocking side effects
11
How does post-marketing surveillance benefit patients?
Ensures safety long-term
Eliminates side effects
Speeds up drug production
Improves drug efficacy
12
What does a narrow therapeutic range imply?
Drug has low potency
Necessity of monitoring
Drug is ineffective
Wider safety margin
13
What are characteristics of graded dose-response curves?
Reflect all-or-nothing response
Sigmoidal shape
Represent individual response
Show EC₅₀
14
What are parts of drug discovery?
Test lead safety
Find a lead compound
Submit NDA application
Optimize structure
15
What is indicated by LD₅₀ in quantal curves?
Dose for therapeutic effect
Dose causing 50% lethality
Dose for 50% receptor binding
Dose causing max efficacy
16
What distinguishes a Type A ADR?
Predictable and dose-related
Not related to drug dose
Due to drug allergy
Unpredictable and genetic
17
What does Rifampin do in pharmacokinetic interactions?
Induces liver enzymes
Blocks drug absorption
Reduces receptor binding
Inhibits renal excretion
18
Which are uses of quantal dose-response curves?
Determine TD₅₀
Find Therapeutic Index
Calculate LD₅₀
Determine ED₅₀
19
What concept does Rate Theory rely on?
Response ∝ binding speed
Response ∝ receptor occupation
Receptors oscillate to active state
Shape changes enhance binding
20
What is the goal of Phase II trials?
Identify manufacturing issues
Submit drug application
Test efficacy in patients
Confirm safety in animals
21
What does a small therapeutic index imply?
Drug is safer
Low toxicity risk
Narrow safety margin
Requires close monitoring
22
What does a high TI signify?
Tight monitoring needed
High toxicity risk
All receptors occupied
Larger safety margin
23
What is the purpose of post-marketing surveillance?
Monitor long-term safety and rare side effects
Test animal efficacy
Ensure market demand
Optimize manufacturing
24
Which phase tests a drug against existing treatments?
Phase III
Preclinical testing
Phase II
Phase I
25
What happens with a competitive antagonist?
Irreversibly binds receptor
Max response decreases
Blocks inverse agonist
Dose-response curve shifts right
26
What is the behavior of partial agonists?
Increase EC₅₀
Reduce max efficacy
Activate all receptors
Bind irreversibly
27
What happens when an agonist binds per Induced Fit theory?
Rate of binding controls activity
Receptor oscillates
Receptors switch to active state
Shape changes enhance binding
28
How does an inverse agonist work?
Reduces baseline receptor activity
Activates all receptors
Increases maximum efficacy
Prevents agonist binding
29
What is the primary feature of noncompetitive antagonists?
Blocks agonist site
Reduces maximal efficacy
Blocks inverse agonist
Binds reversibly
30
Which are examples of post-marketing surveillance?
Ensure drug quality
Detect rare side effects
Test large patient group
Monitor long-term safety
31
What are characteristics of a partial agonist?
Reaches maximum efficacy
Produces weaker response
Binds to receptors
Blocks agonist binding
32
How do inverse agonists reduce receptor activity?
Prevent receptor oscillation
Increase receptor binding
Reduce all receptor activation
Reduce baseline activity
33
What happens after a drug is approved?
Submit NDA application
Phase III trials begin
Post-marketing surveillance starts
Manufacturing begins
34
What does efficacy refer to in dose-response relationships?
Dose producing 50% effect
Receptor occupation level
Max effect a drug can achieve
Drug's safety margin
35
What occurs in the discovery phase of drug development?
Find lead compounds
Test long-term safety
Manufacturing scale-up
Animal testing begins
36
What happens at ED₅₀ in quantal curves?
Max response achieved
50% achieve therapeutic response
50% die from toxicity
All receptors occupied
37
What does ED₅₀ represent?
Dose for toxicity
Dose for 50% therapeutic effect
Dose for max response
Dose where drug binds all receptors
38
What is an outcome of pharmacodynamic interactions?
Delayed drug absorption
Additive or counteractive effects
Modified renal excretion
Altered drug metabolism
39
How does Activation-Aggregation theory define inverse agonists?
Prevents binding
Stabilizes active form
Shifts receptors to inactive state
Increases receptor response
40
What is reduced by noncompetitive antagonists?
Safety index
Dose response
Maximum efficacy
Potency
41
Which receptor theory involves shape change?
Activation-Aggregation
Induced Fit
Occupation Theory
Rate Theory
42
What is an example of a pharmacodynamic interaction?
One drug alters liver enzymes
Two sedatives increase sedation
Drug blocks absorption
Drug changes renal clearance
43
What are true of competitive antagonists?
Decreases max efficacy
Shifts dose–response curve
Increases required agonist dose
Reversibly binds agonist site
44
What occurs in basic research during drug discovery?
Test drug structure safety
Submit regulatory documents
Understand disease targets
Animal testing starts
45
Which drug action is defined by Macromolecular Perturbation Theory?
Agonists induce productive shape change
Rate determines drug efficacy
Shape changes are unimportant
Antagonists stabilize active forms
46
How does a noncompetitive antagonist act?
Shifts curve left
Increases receptor activity
Binds irreversibly to receptor
Reversibly blocks agonist binding
47
What is true of slow drug dissociation in Rate Theory?
Acts like an antagonist
Improves receptor binding
Reduces receptor activity
Acts like an agonist
48
Why use quantal dose-response curves?
Identify population effects
Show sigmoidal response
Determine individual EC₅₀
Assess receptor binding
49
Which theory describes receptor state oscillation?
Occupation Theory
Activation-Aggregation
Rate Theory
Induced Fit
50
What is a characteristic of pharmacokinetic interactions?
Sedatives amplify each other
Drugs affect each other's metabolism
Drugs compete for the same pathway
Effects occur at the receptor
51
Which are effects of a partial agonist?
Shifts curve right
Less than max response
Reduces full agonist effect
Partially activates receptors
52
What describes noncompetitive antagonists?
Reversible binding
Competes with agonists
Irreversible or allosteric
Reduces maximal efficacy
53
What is the focus of early preclinical testing?
Human safety trials
Identify effective lead compounds
Assess drug safety in animals
Develop manufacturing process
54
What step occurs after Phase III trials?
Basic research
Preclinical testing
Regulatory approval
Manufacturing optimization
55
Why do spare receptors exist?
To increase potency
Allow max response with fewer occupied receptors
Reflect receptor efficacy
Prevent antagonist effects
56
How do inverse agonists differ from antagonists?
Increase receptor max response
Reduce baseline receptor activity
Increase receptor activity
Prevent agonist binding
57
What defines EC₅₀ in graded curves?
Dose where 50% respond
Dose for 50% of max effect
Dose for max response
Therapeutic dose
58
What defines a full agonist?
Reduces baseline activity
Partially activates receptors
Reversibly blocks agonists
Fully activates receptors
59
What is tested in Phase I clinical trials?
Efficacy in large groups
Comparison to existing drugs
Long-term side effects
Safety and dosing in healthy volunteers
60
What happens in preclinical testing?
Early efficacy tests
Human dosing tests
Animal safety tests
Lab safety tests
61
What does regulatory approval require?
Clinical safety data
Market surveillance
Animal safety data
Drug structure optimization
62
What does a sigmoidal curve indicate?
All-or-none reaction
Individual dose-response
Population response
Receptor oscillation
63
What is a characteristic of a graded dose-response curve?
All-or-nothing response
Population response curve
Requires receptor saturation
Reflects individual response
64
What is true of a large therapeutic index?
Monitoring is critical
Reflects low potency
Drug is safer
Drug is riskier
65
What effect does a partial agonist have?
Decreases full agonist effect
Prevents receptor binding
Maximizes receptor activation
Shifts response curve left
66
What happens to EC₅₀ with competitive antagonists?
EC₅₀ decreases
EC₅₀ shifts left
EC₅₀ remains constant
EC₅₀ shifts right
67
Which receptor theory predicts slow drug dissociation effects?
Rate Theory
Macromolecular Perturbation Theory
Activation-Aggregation
Occupation Theory
68
What happens when noncompetitive antagonists act?
Max efficacy is reduced
Partial activation occurs
Max efficacy remains intact
Shifts curve to the right
69
What does Macromolecular Perturbation Theory include?
Agonists change receptor shapes
Response ∝ receptor occupation
Blends Induced Fit + Rate
Antagonists induce non-productive changes
70
What defines pharmacokinetic drug interactions?
Drugs counteract each other
Additive drug effects
Drug targets the same receptor
One drug alters metabolism of another
71
How is TI calculated?
ED₅₀ / TD₅₀
Max efficacy / potency
TD₅₀ / ED₅₀
Max dose / min dose
72
What is a key trait of Type B ADRs?
Predictable and dose-related
Unpredictable and idiosyncratic
Directly related to potency
Occurs at high doses only
73
What defines a Type B ADR?
Idiosyncratic and genetic effects
Predictable effects
Dose-related effects
Related to pharmacokinetics
74
Which are examples of pharmacokinetic interactions?
Adds drug effects together
Affects excretion
Alters drug metabolism
Changes absorption
75
What defines a full agonist?
Maximal response
Reduces baseline activity
Weaker response
Blocks agonist
76
Which statement defines a competitive antagonist?
Competes for active binding site
Binds irreversibly
Blocks baseline receptor activity
Shifts receptor oscillation
77
Which statements are true about Type B ADRs?
Can be genetic or allergic
Related to drug dose
Unpredictable reaction
Idiosyncratic effect
78
What defines a partial agonist?
Reduces baseline activity
Blocks receptor activity
Produces maximum response
Weaker response even at max receptor binding
79
What curve type is used for population-based drug response?
Sigmoidal curve
Graded curve
Quantal curve
Spare receptor curve
80
What is a key feature of an inverse agonist?
Maximizes receptor activity
Blocks agonist
Reduces receptor baseline activity
Competes for active site
81
What are true of competitive antagonists?
Binding is reversible
Can be overcome with agonist dose
Competes with agonists for site
Blocks inverse agonists
82
What is the main goal of Phase II trials?
Assess safety in healthy volunteers
Submit NDA application
Monitor rare side effects
Assess efficacy in patients
83
Which statements align with Activation-Aggregation theory?
Agonists push active state
Receptors oscillate between states
Antagonists block inactive state
Inverse agonists stabilize inactive
84
How does an inverse agonist affect receptor activity?
Reduces baseline activity
Blocks agonist binding
Prevents oscillation
Increases baseline activity
85
What happens with low doses of noncompetitive antagonists?
All receptors are occupied
Potency increases
Max response remains possible
Efficacy is immediately reduced
86
What occurs when a full agonist binds?
Partial receptor activation
Maximum receptor activation
Blocks all receptor activity
Receptor remains inactive
87
What effect does a competitive antagonist have on EC₅₀?
Shifts EC₅₀ to the right
Prevents EC₅₀ binding
Reduces EC₅₀
Increases receptor activity
88
What is the focus of Occupation Theory?
Inactive vs active receptor states
Rate of binding/detachment
Response ∝ receptors occupied
Shape change upon binding
89
Which scenario involves spare receptors?
Max response despite low receptor binding
Receptor saturation needed for response
Population-based response
Reduced drug efficacy
90
What does Type A ADR refer to?
Unrelated to drug action
Unpredictable reaction
Predictable dose-related reaction
Idiosyncratic reaction
91
How does a competitive antagonist affect efficacy?
Prevents receptor oscillation
Blocks efficacy completely
Does not reduce max efficacy
Increases max response
92
What parameter measures drug safety margin?
Efficacy
Spare receptor effect
Graded response curve
Therapeutic Index
93
How do pharmacodynamic interactions occur?
Two drugs interact via same/different pathways
One drug alters metabolism of another
Drugs affect absorption or excretion
One drug prevents drug binding
94
What is a goal of pharmacovigilance?
Preventing drug binding
Maximizing efficacy
Monitoring ADRs in populations
Reducing drug potency
95
What is true for irreversible antagonists?
Reduces receptor max response
Can be overcome by agonist dose
Acts like inverse agonist
Binds allosterically
96
What factor is critical for narrow therapeutic range drugs?
Therapeutic Drug Monitoring
Spare receptors
Efficacy at max dose
Therapeutic Index
97
Which describes Phase III clinical trials?
Large group testing safety and efficacy
Small healthy volunteer group
Animal studies and lab work
Early pre-discovery research
98
What mechanism allows a competitive antagonist to act?
Blocks receptor oscillation
Induces receptor shape change
Competes at agonist site
Irreversible binding
99
What are characteristics of noncompetitive antagonists?
Irreversibly binds receptors
Binds allosterically
Reversible binding
Reduces max response
100
How does an allosteric antagonist act?
Prevents receptor oscillation
Activates receptors
Competes for agonist site
Reduces maximal efficacy

pharmacology pharmacodynamic 1 Flashcards | StudBud