PHARMACOKINETICS AND PHARMACODYNAMICS

Discussion: 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.

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.

Assignment

Post a description of the patient case from your experiences, observations, and/or clinical practice from the last 5 years. Then, describe factors that might have influenced pharmacokinetic and pharmacodynamic processes of the patient you identified. Finally, explain details of the personalized plan of care that you would develop based on influencing factors and patient history in your case. Be specific and provide examples.

Learning Resources

Required Readings (click to expand/reduce)

Rosenthal, L. D., & Burchum, J. R. (2018). Lehne’s pharmacotherapeutics for advanced practice providers. St. Louis, MO: Elsevier.

· Chapter 1, “Prescriptive Authority” (pp. 1–3)

· Chapter 2, “Rational Drug Selection and Prescription Writing” (pp. 5–9)

· Chapter 3, “Promoting Positive Outcomes of Drug Therapy” (pp. 11–16)

· Chapter 4, “Pharmacokinetics, Pharmacodynamics, and Drug Interactions” (pp. 17–40)

· Chapter 5, “Adverse Drug Reactions and Medical Errors” (pp. 41–49)

· Chapter 6, “Individual Variation in Drug Response” (pp. 51–56)

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. (n.d.-a). Code of federal regulations. Retrieved February 1, 2019, from https://www.deadiversion.usdoj.gov/21cfr/cfr/1300/1300_01.htm

This website outlines the code of federal regulations for prescription drugs.

Drug Enforcement Administration. (n.d.-b). 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.deadiversion.usdoj.gov/pubs/manuals/pract/index.html

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.-c). 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. (2015). Guide to the code of ethics for nurses with interpretive statements: Development, interpretation, and application. Silver Spring, Maryland: American Nurses Association, 2015. 

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 of Nurse Practitioners, 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.

 
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