Medication Reconciliation and Adverse Drug Reactions

Medication errors and adverse drug reactions (ADRs) are among the most common — and most preventable — sources of patient harm. This note reviews the medication reconciliation process at transitions of care, how to distinguish ADRs from side effects and allergies, and the priority nursing actions when a reaction occurs.

Medication Reconciliation

• Medication errors most commonly occur during transitions of care.
• Key transitions include admission, transfer, and discharge.
• The goal is to prevent omissions, duplications, and interactions.

The Reconciliation Process

• Collect — Obtain a complete list of medications: prescription, OTC, and herbal/supplements.
• Compare — Match home medications against new orders.
• Clarify — Resolve any discrepancies with the provider or patient.
• Reconcile — Update the medication list so it is accurate and current.
• Communicate — Share the reconciled list with the patient and care team.

Safe vs. Unsafe Practice

Safe practice:

• Verify the home medication list with the patient or family.
• Ask specifically about supplements, OTC products, and herbals.
• Clarify all discrepancies before administering medications.
• Reconcile again at discharge.

Unsafe practice:

• Assuming the existing list is accurate.
• Ignoring OTC and herbal products.
• Carrying over errors from prior records.
• Skipping a final review at discharge.

Adverse Drug Reactions (ADRs)

• An ADR is a harmful, unintended response to a medication.
• ADRs can occur even at normal therapeutic doses.
• An ADR is distinct from an expected side effect.

ADR vs. Side Effect vs. Allergy

• Side effect — Predictable, often mild (e.g., drowsiness from an antihistamine).
• ADR — Harmful and unintended response (e.g., GI bleeding).
• Allergy — Immune-mediated response (e.g., rash, anaphylaxis).

High-Risk Adverse Drug Reactions

• Anaphylaxis
• Stevens-Johnson syndrome
• GI bleeding
• Severe hypoglycemia
• Respiratory depression

Nursing Actions for ADRs

• Stop the medication immediately.
• Assess airway, breathing, and circulation (ABCs).
• Notify the provider promptly.
• Administer the antidote if one is ordered.
• Document the reaction clearly, including the drug, dose, time, and patient response.

Common Exam Traps

• Confusing side effects with ADRs.
• Forgetting to include OTC and herbal medications in the reconciliation.
• Restarting home medications without reconciliation.
• Failing to document an ADR as an allergy when appropriate.
• Assuming the provider already completed reconciliation.

Key Takeaways

• Reconcile medications at every transition of care: admission, transfer, and discharge.
• A complete medication list must include prescription, OTC, and herbal products.
• ADRs are harmful and unintended; allergies are immune-mediated; side effects are predictable.
• For severe reactions: stop the drug, assess ABCs, notify the provider, and document.
• When in doubt, patient safety always comes first.