The largest and most detailed study of the long-term impact of anticholinergic drugs, a class of drugs commonly prescribed in the United States and United Kingdom for depression and incontinence, has found that their use is associated with increased risk of dementia, even when taken 20 years before diagnosis of cognitive impairment.
A team of researchers analyzed more than 27 million prescriptions from the US, UK and Ireland to compare medical records of 40,770 patients over the age of 65 who had been diagnosed with dementia, with records of 283,933 older adults without dementia.
The researchers found greater incidence of dementia among patients prescribed anticholinergic antidepressants, anticholinergic bladder medications and anticholinergic Parkinson’s disease medications than among older adults who were not prescribed these drugs.
Dementia increased with greater exposure to anticholinergic medications.
“Anticholinergic Medication and Risk of Dementia: Case-control Study” is published in BMJ (formerly the British Medical Journal) an international peer-reviewed medical journal.
“Anticholinergics, medications that block acetylcholine, a nervous system neurotransmitter, have previously been implicated as a potential cause of cognitive impairment,” said investigator Noll Campbell, PharmD, MS, a co-author of the new BMJ study. “This study is large enough to evaluate the long-term effect and determine that harm may be experienced years before a diagnosis of dementia is made.”
These findings make it clear that clinicians need to carefully consider the anticholinergic burden of their patients and weigh other options. Physicians should review all the anticholinergic medications – including over-the-counter drugs – that patients of all ages are taking and determine safe ways to take individuals off anticholinergic medications in the interest of preserving brain health.
“This research is really important because there are an estimated 350 million people affected globally by depression. Bladder conditions requiring treatment are estimated to affect over 13 percent of men and 30 percent of women in the UK and US,” said study lead researcher George Savva, PhD, of East Anglia’s School of Health Sciences.
“We don’t know exactly how anticholinergics might cause dementia,” said study co-author Chris Fox, MD, professor of clinical psychiatry and a consultant psychiatrist. “Further research is needed to understand possible reasons for this link. In the meantime, I strongly advise patients with any concerns to continue taking their medicines until they have consulted their doctor or pharmacist.”
Study co-author Ian Maidment, PhD, senior lecturer in clinical pharmacy at Aston University in the UK, said: “With many medicines having some anticholinergic activity, one key focus should be de-prescribing. Clinical staff, patients and carers need to work together collaboratively to limit the potential harm associated with anticholinergics.”
Source: Kathryn Richardson et al. Anticholinergic drugs and risk of dementia: case-control study, BMJ (2018). DOI: 10.1136/bmj.k1315