Managing Alzheimer's Sundowning

Initial Approach: Non-Pharmacological Interventions

The American Academy of Family Physicians recommends implementing non-pharmacological strategies before resorting to medications for behavioral symptoms in Alzheimer's disease, as sundowning responds well to environmental and routine modifications 2.
Setting consistent times for exercise, meals, and sleep helps regulate disrupted circadian rhythms, which are central to sundowning pathophysiology due to suprachiasmatic nucleus degeneration 2, 1.
Scheduling activities earlier in the day when the patient is most alert, avoiding overstimulation in late afternoon, is beneficial 1.
Implementing a structured exercise program with daily walking for 5-30 minutes as part of 50-60 minutes total daily activity, distributed throughout the day to prevent fatigue, is recommended 3.

Eliminating environmental hazards like slippery floors and throw rugs that become more dangerous when confusion worsens is crucial 2, 3.
Reducing noise, clutter, and stimulation in late afternoon and evening hours helps minimize agitation 1.
Using calendars, labels, and orientation cues to minimize confusion is beneficial 2.

Using distraction and redirection techniques when agitation begins rather than confrontation is recommended 2.
Simplifying tasks and providing meaningful but not overstimulating activities helps reduce agitation 1, 2.

If the patient is already on a cholinesterase inhibitor (donepezil, rivastigmine, or galantamine) for cognitive symptoms, ensuring they are at therapeutic doses can reduce behavioral and psychopathologic symptoms 4, 2.
Donepezil 10 mg daily or rivastigmine up to 6 mg twice daily may help with agitation 4.
Melatonin supplementation may help given the decreased melatonin production associated with sundowning, addressing the underlying circadian rhythm disruption with minimal side effects 5.

Only using atypical antipsychotics for severe, dangerous symptoms (delusions, hallucinations, severe psychomotor agitation, combativeness) that have not responded to other measures is recommended 1.
Risperidone: starting 0.25 mg at bedtime, maximum 2-3 mg daily, and Olanzapine: starting 2.5 mg at bedtime, maximum 10 mg daily, are options, but with caution due to potential side effects 1.
The American College of Physicians emphasizes using antipsychotics with extreme caution due to increased risk of cerebrovascular events and mortality in dementia patients 2.

Selective serotonin reuptake inhibitors (citalopram or sertraline) are first-line if depression contributes to evening behavioral symptoms, as they have minimal anticholinergic effects 5.

Starting with the lowest possible dose and increasing slowly while monitoring for side effects is crucial 5.
After behavioral symptoms are controlled for 4-6 months, attempting to reduce the dose periodically to determine if continued medication is necessary is recommended 5.

Not jumping to antipsychotics first, as they carry significant mortality risk and should be reserved for dangerous behaviors only, is important 1, 2.
Not ignoring underlying medical issues, such as pain, infection, constipation, or medication side effects, which can worsen evening agitation, is crucial 1.
Not using tacrine, as it is no longer first-line due to hepatotoxicity requiring frequent monitoring, is recommended 4, 2.