Discussion: Pharmacokinetics and Pharmacodynamics

Discussion: Pharmacokinetics and Pharmacodynamics

 

Discussion: Pharmacokinetics and Pharmacodynamics

In my past clinical experience, I assessed a 54-year-old AA female client who presented with obesity and complaints of increased thirst and excessive urine production. The patient was diagnosed with type 2 diabetes after having several FBS results of more than 130mg/dL on separate days. The patient was initiated on Metformin therapy 850mg orally once daily and Simvastatin 40 mg once daily, in addition to lifestyle modification interventions. The patient’s pharmacokinetic and pharmacodynamic processes caused by the underlying disease may alter her response to medication.

Diabetes may affect the pharmacokinetics of the drugs prescribed by affecting their absorption, secondary to alterations in blood flow in the subcutaneous adipose tissue, blood flow in the muscles, and gastric emptying. Metformin is widely distributed in various body tissues, including the liver, intestine, and kidney, through organic cation transporters (Zeng et al., 2020). Diabetes can affect the drug’s distribution as a result of the non-enzymatic glycation of albumin. Biotransformation of the drugs may also be affected by diabetes because of the regulation of enzymes and transporters involved in drug biotransformation (Rosenthal & Burchum, 2021). Furthermore, excretion of Metformin and Simvastatin may be affected by nephropathy. If the patient has a hepatic impairment, the Metformin’s pharmacokinetics would be altered, increasing the risk of lactic acidosis.

Reduced renal function and renal impairment would affect Metformin’s excretion since it is not metabolized and is excreted unchanged in the urine. Geriatric patients are highly likely to have reduced renal function, and thus Metformin is contraindicated in persons with renal impairment (Drzewoski & Hanefeld, 2021). The associated pharmacokinetic and pharmacodynamic processes may affect the patient’s response to Metformin, resulting in failing to attain the desired drug effects (Zeng et al., 2020). As a result, the patient’s blood sugar levels may fail to reduce as expected, resulting in constant hyperglycemic levels.

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References

Drzewoski, J., & Hanefeld, M. (2021). The Current and Potential Therapeutic Use of Metformin-The Good Old Drug. Pharmaceuticals (Basel, Switzerland), 14(2), 122. https://doi.org/10.3390/ph14020122

Rosenthal, L. D., & Burchum, J. R. (2021). Lehne’s pharmacotherapeutics for advanced practice nurses and physician assistants (2^nd ed.) St. Louis, MO: Elsevier.

Zeng, Z., Huang, S. Y., & Sun, T. (2020). Pharmacogenomic Studies of Current Antidiabetic Agents and Potential New Drug Targets for Precision Medicine of Diabetes. Diabetes therapy : research, treatment and education of diabetes and related disorders, 11(11), 2521–2538. https://doi.org/10.1007/s13300-020-00922-x

Pharmacokinetics and Pharmacodynamics

As an advanced practice nurse assisting physicians in the diagnosis and treatment of disorders, it is important to not only understand the impact of disorders on the body, but also the impact of drug treatments on the body. The relationships between drugs and the body can be described by pharmacokinetics and pharmacodynamics.
Pharmacokinetics describes what the body does to the drug through absorption, distribution, metabolism, and excretion, whereas pharmacodynamics describes what the drug does to the body.

Photo Credit: Getty Images/Ingram Publishing
When selecting drugs and determining dosages for patients, it is essential to consider individual patient factors that might impact the patient’s pharmacokinetic and pharmacodynamic processes. These patient factors include genetics, gender, ethnicity, age, behavior (i.e., diet, nutrition, smoking, alcohol, illicit drug abuse), and/or pathophysiological changes due to disease.
For this Discussion, you reflect on a case from your past clinical experiences and consider how a patient’s pharmacokinetic and pharmacodynamic processes may alter his or her response to a drug.
To Prepare
• Review the Resources for this module and consider the principles of pharmacokinetics and pharmacodynamics.
• Reflect on your experiences, observations, and/or clinical practices from the last 5 years and think about how pharmacokinetic and pharmacodynamic factors altered his or her anticipated response to a drug.
• Consider factors that might have influenced the patient’s pharmacokinetic and pharmacodynamic processes, such as genetics (including pharmacogenetics), gender, ethnicity, age, behavior, and/or possible pathophysiological changes due to disease.
• Think about a personalized plan of care based on these influencing factors and patient history in your case study.

Learning Resources

Required Readings (click to expand/reduce)

Rosenthal, L. D., & Burchum, J. R. (2021). Lehne’s pharmacotherapeutics for advanced practice nurses and physician assistants (2nd ed.) St. Louis, MO: Elsevier.
• Chapter 1, “Prescriptive Authority” (pp. 1–3)
• Chapter 2, “Rational Drug Selection and Prescription Writing” (pp. 4–7)
• Chapter 3, “Promoting Positive Outcomes of Drug Therapy” (pp. 8–12)
• Chapter 4, “Pharmacokinetics, Pharmacodynamics, and Drug Interactions” (pp. 13–33)
• Chapter 5, “Adverse Drug Reactions and Medication Errors” (pp. 34–42)
• Chapter 6, “Individual Variation in Drug Response” (pp. 43–45)

American Geriatrics Society 2019 Beers Criteria Update Expert Panel. (2019). American Geriatrics Society 2019 updated AGS Beers criteria for potentially inappropriate medication use in older adults. Journal of the American Geriatrics Society, 67(4), 674–694. doi:10.1111/jgs.15767
American Geriatrics Society 2019 updated AGS Beers criteria for potentially inappropriate medication use in older adults by American Geriatrics Society, in Journal of the American Geriatrics Society, Vol. 67/Issue 4. Copyright 2019 by Blackwell Publishing. Reprinted by permission of Blackwell Publishing via the Copyright Clearance Center.

This article is an update to the Beers Criteria, which includes lists of potentially inappropriate medications to be avoided in older adults as well as newly added criteria that lists select drugs that should be avoided or have their dose adjusted based on the individual’s kidney function and select drug-drug interactions documented to be associated with harms in older adults.

Drug Enforcement Administration. (2021). CFR – Code of Federal Regulations Title 21. https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfcfr/CFRSearch.cfm?CFRPart=1300
This website outlines the code of federal regulations for prescription drugs.

Drug Enforcement Administration. (n.d.-a). Mid-level practitioners authorization by state. Retrieved May 13, 2019 from http://www.deadiversion.usdoj.gov/drugreg/practioners/index.html

This website outlines the schedules for controlled substances, including prescriptive authority for each schedule.

Drug Enforcement Administration. (2006). Practitioner’s manual. Retrieved from http://www.legalsideofpain.com/uploads/pract_manual090506.pdf
This manual is a resource for practitioners who prescribe, dispense, and administer controlled substances. It provides information on general requirements, security issues, recordkeeping, prescription requirements, and addiction treatment programs.

Drug Enforcement Administration. (n.d.-b). Registration. Retrieved February 1, 2019, from https://www.deadiversion.usdoj.gov/drugreg/index.html

This website details key aspects of drug registration.

Fowler, M. D. M., & American Nurses Association. (2015). Guide to the code of ethics for nurses with interpretive statements: Development, interpretation, and application (2nd ed.). American Nurses Association.

This resource introduces the code of ethics for nurses and highlights critical aspects for ethical guideline development, interpretation, and application in practice.

Institute for Safe Medication Practices. (2017). List of error-prone abbreviations, symbols, and dose designations. Retrieved from https://www.ismp.org/recommendations/error-prone-abbreviations-list

This website provides a list of prescription-writing abbreviations that might lead to misinterpretation, as well as suggestions for preventing resulting errors.

Ladd, E., & Hoyt, A. (2016). Shedding light on nurse practitioner prescribing. The Journal for Nurse Practitioners, 12(3), 166–173. doi:10.1016/j.nurpra.2015.09.17

This article provides NPs with information regarding state-based laws for NP prescribing.

Sabatino, J. A., Pruchnicki, M. C., Sevin, A. M., Barker, E., Green, C. G., & Porter, K. (2017). Improving prescribing practices: A pharmacist‐led educational intervention for nurse practitioner students. Journal of the American Association ofNursePractitioners, 29(5), 248–254. doi:10.1002/2327-6924.12446

The authors of this article assess the impact of a pharmacist‐led educational intervention on family nurse practitioner (FNP) students’ prescribing skills, perception of preparedness to prescribe, and perception of pharmacist as collaborator.

Required Media (click to expand/reduce)

Introduction to Advanced Pharmacology
Meet Dr. Terry Buttaro, associate professor of practice at Simmons College of Nursing and Health Sciences as she discusses the importance of pharmacology for the advanced practice nurse. (8m)
Accessible player

Nature Video. (2016). The evolution of oral anticoagulants [Video]. https://www.youtube.com/watch?v=Gp-ucDRiaUA
Note: This media program is approximately 5 minutes.

Speed Pharmacology. (2015). Pharmacology – Pharmocokinetics (Made Easy) [Video]. https://www.youtube.com/watch?v=NKV5iaUVBUI&t=16s
Note: This media program is approximately 14 minutes.

Speed Pharmacology. (2017). Pharmacology – Diuretics (Made Easy) [Video]. https://www.youtube.com/watch?v=9OBvNpnS0h4&t=664s
Note: This media program is approximately 18 minutes.

Speed Pharmacology. (2017). Pharmacology – Antiarrhythmic Drugs (Made easy) [Video]. https://www.youtube.com/watch?v=9xSqezCMHnw&t=1205s
Note: This media program is approximately 23 minutes.

Speed Pharmacology. (2015). Pharmacology – Pharmocokinetics (Made Easy) [Video]. https://www.youtube.com/watch?v=NKV5iaUVBUI&t=16s
Note: This media program is approximately 14 minutes.

Speed Pharmacology. (2016). Pharmacology – Adrenergic receptors & agonists (MADE EASY) [Video]. https://www.youtube.com/watch?v=KtmV-yMDYPI&t=372s
Note: This media program is approximately 18 minutes.

Speed Pharmacology. (2017). Drugs for Hyperlipidemia (Made Easy) [Video]. https://www.youtube.com/watch?v=Of1Aewx-zRM&t=24s
Note: This media program is approximately 14 minutes.

RUBRIC:

Excellent Good Fair Poor
Main Posting 45 (45%) – 50 (50%)
Answers all parts of the discussion question(s) expectations with reflective critical analysis and synthesis of knowledge gained from the course readings for the module and current credible sources.

Supported by at least three current, credible sources.

Written clearly and concisely with no grammatical or spelling errors and fully adheres to current APA manual writing rules and style. 40 (40%) – 44 (44%)
Responds to the discussion question(s) and is reflective with critical analysis and synthesis of knowledge gained from the course readings for the module.

At least 75% of post has exceptional depth and breadth.

Supported by at least three credible sources.

Written clearly and concisely with one or no grammatical or spelling errors and fully adheres to current APA manual writing rules and style. 35 (35%) – 39 (39%)
Responds to some of the discussion question(s).

One or two criteria are not addressed or are superficially addressed.

Is somewhat lacking reflection and critical analysis and synthesis.

Somewhat represents knowledge gained from the course readings for the module.

Post is cited with two credible sources.

Written somewhat concisely; may contain more than two spelling or grammatical errors.

Contains some APA formatting errors. 0 (0%) – 34 (34%)
Does not respond to the discussion question(s) adequately.

Lacks depth or superficially addresses criteria.

Lacks reflection and critical analysis and synthesis.

Does not represent knowledge gained from the course readings for the module.

Contains only one or no credible sources.

Not written clearly or concisely.

Contains more than two spelling or grammatical errors.

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Does not adhere to current APA manual writing rules and style.
Main Post: Timeliness 10 (10%) – 10 (10%)
Posts main post by day 3 0 (0%) – 0 (0%) 0 (0%) – 0 (0%) 0 (0%) – 0 (0%)
Does not post by day 3
First Response 17 (17%) – 18 (18%)
Response exhibits synthesis, critical thinking, and application to practice settings.

Responds fully to questions posed by faculty.

Provides clear, concise opinions and ideas that are supported by at least two scholarly sources.

Demonstrates synthesis and understanding of learning objectives.

Communication is professional and respectful to colleagues. .

Responses to faculty questions are fully answered, if posed.

Response is effectively written in standard, edited English. 15 (15%) – 16 (16%)
Response exhibits synthesis, critical thinking, and application to practice settings.

Responds fully to questions posed by faculty.

Provides clear, concise opinions and ideas that are supported by at least two scholarly sources.

Demonstrates synthesis and understanding of learning objectives.

Communication is professional and respectful to colleagues. .

Responses to faculty questions are fully answered, if posed.

Response is effectively written in standard, edited English. 13 (13%) – 14 (14%)
Response is on topic and may have some depth.

Responses posted in the discussion may lack effective professional communication.

Responses to faculty questions are somewhat answered, if posed.

Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited. 0 (0%) – 12 (12%)
Response may not be on topic and lacks depth.

Responses posted in the discussion lack effective professional communication.

Responses to faculty questions are missing.

No credible sources are cited.
Second Response 16 (16%) – 17 (17%)
Response exhibits synthesis, critical thinking, and application to practice settings.

Responds fully to questions posed by faculty.

Provides clear, concise opinions and ideas that are supported by at least two scholarly sources.

Demonstrates synthesis and understanding of learning objectives.

Communication is professional and respectful to colleagues. .

Responses to faculty questions are fully answered, if posed.

Response is effectively written in standard, edited English. 14 (14%) – 15 (15%)
Response exhibits critical thinking and application to practice settings.

Communication is professional and respectful to colleagues.

Responses to faculty questions are answered, if posed.

Provides clear, concise opinions and ideas that are supported by two or more credible sources.

Response is effectively written in standard, edited English. 12 (12%) – 13 (13%)
Response is on topic and may have some depth.

Responses posted in the discussion may lack effective professional communication.

Responses to faculty questions are somewhat answered, if posed. .

Response may lack clear, concise opinions and ideas, and a few or no credible sources are cited. 0 (0%) – 11 (11%)
Response may not be on topic and lacks depth.

Responses posted in the discussion lack effective professional communication.

Responses to faculty questions are missing.

No credible sources are cited.
Participation 5 (5%) – 5 (5%)
Meets requirements for participation by posting on three different days. 0 (0%) – 0 (0%) 0 (0%) – 0 (0%) 0 (0%) – 0 (0%)
Does not meet requirements for participation by posting on 3 different days