8.3 Therapeutic Implementation & Medication Reconciliation

Implementation of the Pharmacotherapy Plan

Once a thorough clinical assessment is complete and pharmacokinetic parameters have been considered, the pharmacist must transition to the 'Implement' phase of the Pharmacists' Patient Care Process (PPCP). Selecting the optimal therapeutic regimen requires synthesizing evidence-based guidelines with patient-specific nuances. However, the most brilliantly designed regimen will fail if it is not correctly implemented or if the patient cannot adhere to it.

Therapeutic Selection Process

Therapeutic selection is rarely a simple translation of a guideline algorithm. It requires a nuanced evaluation of the patient's unique clinical picture:

1. Indication and Efficacy: Does the patient have a valid indication for the drug? Is this the most efficacious agent based on current clinical guidelines (e.g., ACC/AHA for cardiology, KDIGO for nephrology, GOLD for COPD)?
2. Safety and Tolerability: Consider the patient's age (applying Beers Criteria), renal and hepatic function (requiring dose adjustments), and past medical history (e.g., avoiding non-selective beta-blockers in severe reactive airway disease).
3. Drug Interactions: Evaluate for pharmacokinetic (e.g., CYP450 inhibition/induction, absorption chelation) and pharmacodynamic (e.g., additive CNS depression, QTc prolongation) interactions with the patient's existing regimen.
4. Convenience and Adherence: A QD regimen is vastly superior to a QID regimen for adherence. Liquid formulations or crushable tablets may be necessary for patients with dysphagia or enteral feeding tubes.
5. Cost and Access: This is often the most significant barrier. If a preferred SGLT2 inhibitor is prohibitively expensive, an alternative, affordable medication class must be selected, or patient assistance programs initiated.

Barrier Identification and Management

Non-adherence is a pervasive issue, contributing to treatment failure, hospital readmissions, and increased healthcare costs. Pharmacists must proactively identify barriers to adherence during implementation.

• Health Literacy: Patients may not understand why they need the medication or how to take it. Patient education must use the 'teach-back' method, avoiding medical jargon.
• Financial Toxicity: High copays or lack of insurance force patients to ration doses or abandon prescriptions entirely.
• Adverse Effects: Fear of side effects (or actual experience of them) is a major driver of non-adherence. For example, statin-associated muscle symptoms (SAMS) frequently cause patients to stop therapy; pharmacists must assess causality, potentially lower the dose, or switch to a hydrophilic statin (rosuvastatin or pravastatin) before abandoning the class entirely.
• Regimen Complexity: Polypharmacy and complex dosing schedules (e.g., taking medications on an empty stomach vs. with food) overwhelm patients. Deprescribing unnecessary medications and consolidating dosing schedules are vital interventions.

Medication Reconciliation

Medication Reconciliation (MedRec) is a formal, structured process of comparing a patient's new medication orders to all of the medications the patient has been taking. The goal is to avoid medication errors such as omissions, duplications, dosing errors, or drug-drug interactions.

The MedRec Process:

1. Develop a Comprehensive Best Possible Medication History (BPMH): This is the foundation. It requires interviewing the patient/caregiver and verifying with at least one other source (outpatient pharmacy records, previous discharge summaries, pill bottles). It must include Rx, OTCs, herbals, and PRN medications.
2. Compare the BPMH to the New Orders: Compare the list of medications the patient was taking to the medications currently ordered for them in the new setting.
3. Identify and Resolve Discrepancies: This is the core clinical intervention. Are medications missing? Are doses different? Were home medications intentionally discontinued due to an acute illness (e.g., holding an ACE inhibitor in acute kidney injury), or was it an accidental omission?
4. Communicate the Updated List: The reconciled list must be communicated to the patient, caregivers, and the next provider of care.

Transitions of Care (TOC)

Transitions of care refer to the movement of a patient between healthcare locations (e.g., hospital to home, hospital to skilled nursing facility, or ICU to general ward) or providers. These are highly vulnerable periods. It is estimated that over 50% of medication errors and 20% of adverse drug events occur during TOC.

Pharmacist Roles in TOC:

• Admission: Obtaining the BPMH and performing initial admission medication reconciliation to ensure critical chronic medications are appropriately continued or intentionally held.
• Transfer: Reconciling medications when a patient moves between levels of care (e.g., transferring out of the ICU, ensuring IV continuous infusions are appropriately transitioned to oral maintenance doses).
• Discharge: This is the highest risk point. Pharmacists perform discharge medication reconciliation, comparing the hospital orders to the home regimen to generate a finalized discharge list. Crucially, this involves providing intensive discharge counseling. The patient must understand what new medications were started, what old medications were stopped, and what medications had dose changes. Supplying a clear, patient-friendly discharge medication list is a standard of care.
• Post-Discharge Follow-up: Telephone follow-up within 48-72 hours of discharge has been shown to significantly reduce readmission rates. Pharmacists use this call to verify that the patient obtained their medications, understands the new regimen, and has scheduled necessary follow-up appointments.