A systematic review of the novel applications of cannabinoids in dementia care: food refusal and neuropsychiatric symptoms

Abstract

Introduction In recent years, there has been increased research interest investigating the novel use of cannabinoids in the treatment of patients living with dementia. Early clinical research suggests that cannabinoids may be beneficial in a variety of areas, including pain, sleep, weight loss, and behavioral aggression. In particular, cannabinoids may be especially valuable in dementia care in areas where there are currently limited therapies, including food refusal and neuropsychiatric symptoms (NPS) such as agitation and sleep disruption. Pharmacologic interventions for disordered eating in dementia are limited. And although atypical antipsychotics are commonly used to treat NPS, they are associated with an increased risk of serious adverse events and all-cause mortality in older patients. Thus, this study aims to review the current literature on the potential applications of cannabinoids in the treatment of food refusal and neuropsychiatric symptoms in dementia populations. Methods A systematic literature review was performed utilizing six major electronic databases (PubMed, MEDLINE, EMBASE, PsycINFO, Google Scholar, Cochrane CENTRAL) for articles published from database inception to November 2020. Search strings including keywords and Medical Subject Headings (MeSH terms) related to cannabinoids, dementia, food refusal, weight loss, agitation, and neuropsychiatric symptoms were used to identify relevant articles. Results A total of 23 relevant articles were identified that examined the use of cannabinoids including tetrahydrocannabinol, dronabinol, and nabilone in dementia patients. Regarding treatment of NPS in dementia, numerous studies found that use of cannabinoids was associated with potential benefits including reduced nighttime motor activity, improved sleep duration, reduced agitation, and lower Neuropsychiatric Inventory scores. With regards to food refusal, multiple articles documented use of cannabinoids being associated with increased percentage of meals consumed, with one crossover placebo-controlled trial finding increased overall body weight in dementia patients on dronabinol. Documented potential side effects include possible worsening of psychosis and anxiety, although overall, the literature appears to show cannabinoids to be generally well-tolerated. Conclusions Use of cannabinoids as potential treatments for food refusal and neuropsychiatric symptoms in dementia populations is an ongoing area of research. Completed clinical studies done on the subject to date have been small in scale, but have shown cannabinoids to be relatively well-tolerated and have yielded positive results. Thus, cannabinoids may have potential as a therapeutic intervention in dementia care, and these findings warrant further investigation. Funding Not applicable