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Acetylcholinesterase Inhibitors

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Acetylcholinesterase Inhibitors

Key Points

  • Acetylcholinesterase inhibitors block acetylcholine breakdown and increase cholinergic signaling at synapses.
  • Donepezil is used for cognitive symptoms in Alzheimer disease.
  • Give donepezil in the evening and with food to reduce GI upset.
  • Common adverse effects include GI upset, headache, dizziness, insomnia, fatigue, muscle cramps, and abnormal dreams.
  • Liver enzyme elevation can occur and requires monitoring.
  • Medication adherence support is often necessary because cognitive impairment can cause missed evening doses.

Mechanism of Action

Acetylcholinesterase inhibitors block the enzyme that degrades acetylcholine. Increased acetylcholine concentration at the synaptic cleft can improve neuronal signal transmission in selected cognitive-disorder contexts.

Indications

  • Cognitive symptom management in Alzheimer disease (donepezil prototype in this source context).

Nursing Considerations

  • Administer donepezil with food to minimize GI upset.
  • Schedule dosing in the evening, typically just before bedtime.
  • Monitor for GI intolerance, sleep-quality changes, and dizziness-related fall risk.
  • Monitor liver enzyme trends when clinically indicated.
  • Assess medication adherence capacity; involve caregivers when cognitive impairment limits safe self-administration.

Adverse Effects

  • GI upset
  • Headache
  • Dizziness
  • Insomnia and reduced sleep quality
  • Fatigue
  • Muscle cramps
  • Nightmares or abnormal dreams
  • Possible liver enzyme elevation

Health Teaching

  • Take the medication every evening as prescribed.
  • If a dose is missed, take it as soon as remembered unless it is close to the next scheduled dose; do not double-dose.
  • Take with food to improve tolerance.
  • Report persistent GI symptoms, severe dizziness, sleep disturbance, or functional decline.
  • Families/caregivers should use reminder systems or supervised administration when memory impairment affects adherence.

Clinical Judgment Application

Clinical Scenario

A caregiver reports that a patient with Alzheimer disease misses evening donepezil doses and has worsening sleep disturbance.

  • Recognize Cues: Missed doses, cognitive-limitation adherence risk, and adverse sleep symptoms.
  • Analyze Cues: Inconsistent administration reduces therapeutic benefit and can worsen tolerability patterns.
  • Prioritize Hypotheses: Priority is safe medication adherence and adverse-effect mitigation.
  • Generate Solutions: Add caregiver-supervised evening routine, meal-linked dosing cue, and symptom log.
  • Take Action: Reinforce missed-dose rules and escalate persistent adverse effects for provider review.
  • Evaluate Outcomes: Dose adherence improves and sleep/GI symptoms become stable or improve.

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