Drug Selection and Pharmacotherapy Optimization
Drug selection and pharmacotherapy optimization is the area of pharmacy practice concerned with choosing the most appropriate medicine for a given clinical situation and then tailoring the regimen so that benefit is maximized and harm minimized. It draws together evidence appraisal, knowledge of how drugs behave in the body, individual patient characteristics, and the practical realities of safety and cost.
Definition
Drug selection and pharmacotherapy optimization is the systematic process of choosing a medication and adjusting its use for an individual or population so that the chosen regimen reflects the best available evidence of efficacy and safety, the patient's characteristics, and considerations of cost and feasibility.
Scope
This area orients the reader to the principles by which a pharmacotherapeutic choice is reasoned through and refined over time. It groups four topic-level entries: weighing efficacy, safety, and cost in evidence-based selection; using measured drug concentrations to individualize dosing; incorporating genetic and other individual factors in personalized therapy; and recognizing and managing clinically meaningful drug interactions. It treats these as methodological and conceptual subjects within pharmacy practice, not as prescribing or dosing guidance.
Sub-topics
Core questions
- How is the best available evidence on efficacy and safety weighed when several therapeutic options exist?
- When and how can measured drug concentrations or individual patient factors refine a regimen?
- How are clinically important drug interactions recognized and addressed in a therapeutic plan?
- How are benefit, harm, and cost balanced in rational medication use?
Key concepts
- Rational drug use
- Benefit-harm balance
- Pharmacokinetic and pharmacodynamic variability
- Individualization of therapy
- Evidence-based medicine
- Cost-effectiveness in drug selection
- Medication safety
Mechanisms
Optimizing pharmacotherapy rests on understanding why a drug's effect varies between people and over time. Differences in absorption, distribution, metabolism, and elimination shape the concentration a dose achieves, while differences at the drug target shape the response that concentration produces (Wilkinson, 2005). Genetic variation in metabolizing enzymes and transporters is one source of this variability (Wang, 2011). Selection therefore couples population-level evidence of average efficacy and safety (Sackett, 1996) with patient-level factors, and the regimen is then adjusted as response and tolerability are observed.
Clinical relevance
The reasoning grouped under this area underlies much of clinical pharmacy and therapeutics, and appraising medication choices critically is part of practice and education in the health sciences. The entries describe how therapeutic decisions are structured and evaluated; they are reference and educational material and are not a basis for individual prescribing, dosing, or treatment decisions.
Evidence & guidelines
Evidence-based medicine provides the overarching framework for selecting among therapeutic options by integrating the best research evidence with clinical expertise and patient values (Sackett, 1996). Adverse drug reactions are a recognized and partly preventable cause of harm, which motivates careful selection and monitoring (Edwards & Aronson, 2000). Detailed, condition-specific recommendations live in clinical practice guidelines maintained by professional bodies and are outside the scope of this reference entry.
History
The mid-twentieth-century growth of clinical pharmacology established that drug response varies systematically with metabolism and individual physiology. The formalization of evidence-based medicine in the 1990s gave drug selection an explicit appraisal framework (Sackett, 1996), while advances in pharmacokinetics and, later, pharmacogenomics supplied mechanistic accounts of variability (Wilkinson, 2005; Wang, 2011), together shaping the modern practice of optimizing pharmacotherapy.
Key figures
- David Sackett
- Grant Wilkinson
- Richard Weinshilboum
Related topics
Seminal works
- sackett-1996
- wilkinson-2005
- wang-2011
Frequently asked questions
- What does optimizing pharmacotherapy mean?
- It means selecting an appropriate medication and then adjusting how it is used so that the regimen reflects the best evidence, the individual patient's characteristics, and considerations of safety and cost, with the regimen refined as response is observed.
- Why does the same drug and dose affect people differently?
- Differences in how the body absorbs, distributes, metabolizes, and eliminates a drug change the concentration achieved, and differences at the drug target change the response to that concentration; genetic variation is one contributor to both.