Pharmacology, Interdisciplinary Teams, and Nursing Practice

Core Concepts

What pharmacology includes

Pharmacology spans the entire life of a drug, from discovery to the patient's response:

• Pharmacokinetics — how the body handles the drug: absorption (getting in), distribution (getting around), metabolism (being changed, mostly in the liver), and excretion (getting out). The shorthand is ADME.
• Pharmacodynamics — what the drug does: binding to receptors, blocking enzymes, and producing therapeutic effects or adverse effects.
• Pharmacotherapeutics — choosing and using drugs to treat disease, including expected outcomes and monitoring.
• Toxicology — the study of harmful effects, including overdose, cumulative toxicity, and drug–drug interactions.

You will build each of these in detail later in the book; for now, the goal is to recognize that a single drug question (e.g., "Why is this person sleepy after this medication?") can be answered from several of these angles at once.

The interdisciplinary team around a medication

No one person manages a patient's medication therapy alone:

• Prescribers (physicians, APRNs, and in some settings physician assistants) assess the patient and write orders based on diagnosis, evidence, and patient-specific factors.
• Pharmacists verify orders, screen for interactions and allergies, prepare and dispense products, and are the drug-information experts on the team. In many settings they also adjust or recommend therapy under collaborative practice agreements.
• Nurses assess the patient before giving any drug, administer it correctly, observe and document the response, teach the patient, and report concerns back to the prescriber.
• Other disciplines contribute context that changes drug decisions: a dietitian's nutrition status affects drug absorption; a respiratory therapist's assessment can signal adverse effects of a pulmonary drug; social work and care coordination address access and adherence.

The nurse sits at the center of this loop: the nurse is the one who sees the patient before, during, and after each dose.

The medication-use process and the nurse's role

Medication use is a multistep process: prescribing → transcribing/verifying → dispensing → administering → monitoring. Errors can enter at any step, and the nurse is the final checkpoint before the drug reaches the person. This is why nursing education emphasizes the rights of medication administration — commonly the five rights (right patient, right drug, right dose, right route, right time), expanded in many institutions to include right documentation, right reason, right response, and right to refuse. The exact list varies by institution; what never varies is the underlying habit: verify before you give.

The nurse's medication responsibilities typically include:

• Collecting a baseline assessment (allergies, vital signs, lab values, ability to swallow, current medications) before the first dose.
• Verifying the order against the medication record and the drug product itself.
• Administering the drug using the correct technique for the route.
• Observing for therapeutic and adverse effects, and acting on unexpected findings.
• Documenting administration and response per institutional policy.
• Teaching the patient about the drug's purpose, expected effects, and what to report.

These steps are exactly the nursing process — assessment, diagnosis, planning, implementation, evaluation — applied to pharmacology, which is the subject of Chapter 2's first topic.

Scope of practice: it varies

Nursing scope for medications is not uniform. What a nurse may do depends on the state nurse practice act, the setting (hospital, long-term care, clinic, school, home), the practice area (e.g., critical care nurses may titrate infusions under protocol), and institutional policy (e.g., who may administer high-alert drugs, or whether a nurse may take a telephone order). Some functions, such as prescribing, are limited to advanced practice roles; others, such as administering certain vaccines or scheduled drugs, have their own rules. Always confirm scope with your jurisdiction and employer rather than assuming it.

Person-first, patient-centered care

A patient is not "a heart failure" or "a diabetic" — the person is an individual living with heart failure or diabetes. Medication decisions should respect the person's values, preferences, culture, health literacy, and goals. Two patients with identical prescriptions may need entirely different teaching, support, and monitoring. Pharmacology knowledge becomes nursing skill only when it is applied with the person, not to the person.

Common Confusions