Use of potent anticholinergic medications in patients with dementia or other forms of cognitive impairment markedly worsens cognition, accelerates functional decline, and increases the risk of neuropsychiatric complications.
Strong anticholinergics are contraindicated in dementia (Level A evidence).
Even short courses can precipitate delirium and long‑term cognitive loss.
Review all medication lists for hidden anticholinergic burden (e.g., antihistamines, antispasmodics, certain antidepressants).
Use anticholinergic burden scales (e.g., Anticholinergic Cognitive Burden) to guide deprescribing.
Anticholinergics block muscarinic acetylcholine receptors in the central nervous system, reducing cholinergic neurotransmission that is already deficient in Alzheimer’s disease and other dementias. This further impairs memory, attention, and executive function. Peripheral anticholinergic effects (e.g., urinary retention, constipation, dry mouth) can also exacerbate frailty and increase fall risk, indirectly worsening cognitive status.
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