Dementia affects nearly one million people across the UK. Often, it brings changes in memory, mood, and behaviour. Some symptoms, such as agitation, restlessness, or poor sleep, can be particularly difficult for families to manage.
When standard treatments don’t help with symptoms enough, people sometimes ask whether medical cannabis could offer extra support. Research is still early, but this page gives an overview of what dementia is and how it’s typically treated today. Always speak with a clinician before making any changes to care.
What Is Dementia?
Dementia is a general term for conditions that affect how a person thinks, remembers, and functions day-to-day. Alzheimer’s disease is the most common type of dementia, but there are others, too.
Symptoms can include:
- Memory loss or confusion
- Changes in mood or personality
- Agitation or restlessness
- Anxiety or irritability
- Trouble sleeping
- Difficulty with everyday tasks
These symptoms can fluctuate and often change over time. They affect not only the person with dementia but also the people who support them.
Diagnosing Dementia
A dementia diagnosis usually starts with a GP. From there, the process may include:
- Talking through symptoms and medical history
- Simple memory and thinking tests
- Blood tests to rule out other causes
- Brain scans, such as MRI or CT
- Referral to a memory clinic or specialist team
Knowing the type of dementia helps guide treatment and support plans.
Current Treatment Paths
There is no cure for dementia, but several treatments may help manage symptoms or support daily life. What works best depends on the type of dementia and the person’s needs.
Common approaches include:
- Medicines such as cholinesterase inhibitors or memantine
- Treatments for mood, sleep, or anxiety, if needed
- Structured routines to reduce confusion
- Activities that support memory and wellbeing
- Environmental changes, like reducing noise or adjusting lighting
- Support for caregivers, including respite and community services
These options can be helpful, but not everyone responds in the same way. Behavioural symptoms such as agitation, aggression, or sleep disruption can persist despite standard care. This is often when families begin seeking additional options.
Medical Cannabis in the UK
Medical cannabis in the UK has been legal on prescription since 2018, but access is still limited. It is not a first-line treatment for dementia. Instead, specialist doctors may consider it when:
- Standard treatments have not helped enough
- Behavioural symptoms, such as agitation or restlessness, are severe
- Side effects from other medicines are an issue
- A clinician believes a cannabis-based treatment might offer support
Prescriptions are usually issued through private clinics because NHS access is limited. Treatment plans are personalised, and older adults may require closer monitoring because they may be more sensitive to side effects such as drowsiness.
Medical cannabis does not reverse dementia or restore memory. It may be considered only as a supportive option for certain symptoms when other approaches have been ineffective.
What Does the Research Say About Cannabis and Dementia?
Research on medical cannabis for dementia is still early, but interest is growing. Most studies focus on symptoms such as agitation, aggression, anxiety, and sleep problems, not on memory or slowing the disease. The findings show some promise, but results vary, and more high-quality trials are needed.
Cannabinoids and Behavioural Symptoms
Several studies have looked at whether cannabinoids may help with difficult behavioural symptoms.
A recent systematic review found that cannabinoids may reduce agitation and aggression in some people with dementia, but the studies were small, and the evidence quality was low.1
Another review reported similar patterns, noting potential benefits but also pointing out gaps in long-term safety data.2
A major Cochrane review reached a similar conclusion that current research is too limited to make firm recommendations.3 However, it also noted growing interest in using cannabinoids for agitation and other behavioural symptoms.
Early clinical work adds more detail. One pilot study followed people with severe dementia who were given a THC-containing medicine for several months. Many showed reduced agitation, and treatment was generally tolerated, though drowsiness was common.4
CBD-Rich and THC:CBD Medicines
Researchers have also explored the effects of CBD-rich oils and balanced THC:CBD products.
One randomised controlled trial tested a CBD-rich oil for behavioural symptoms and found significant improvements in agitation compared with placebo. Most side effects were mild.5
Other studies have tested THC-based medicines. A large trial of dronabinol, a form of THC, reported reduced agitation in people with moderate to severe Alzheimer’s disease. The main side effect was sleepiness.6
Another trial using nabilone, a synthetic THC-like medicine, also found improvements in agitation, though sedation was noted as well.7
These results suggest that some cannabis-based medicines may help with behavioural symptoms, but the risk of drowsiness must be considered, especially for older adults.
How to Understand the Current Evidence
Right now, research suggests:
- Some cannabis-based treatments may help reduce agitation and related symptoms.
- Effects vary, and not everyone responds in the same way.
- Drowsiness is one of the most common side effects.
- Studies are still small, and long-term safety is not fully known.
Because of these limits, medical cannabis is considered only when other treatments have not helped enough and when a specialist believes it may be safe and appropriate.
Doctor Consultation: What to Expect
If you decide to explore medical cannabis, you’ll meet with a specialist doctor. The appointment is straightforward and focuses on understanding your health and daily needs.
A specialist may:
- Review medical history and current medications
- Ask about specific symptoms, such as agitation, sleep problems, or anxiety
- Look at which treatments have been tried and how well they worked
- Discuss the possible benefits and risks of cannabis-based medicines
- Explain how monitoring and follow-up would work
You’re not expected to decide on the spot. The consultation is an opportunity to learn more and ask questions in a safe, supportive setting.
FAQs About Medical Cannabis and Dementia
Can medical cannabis help with agitation in dementia?
Some early studies suggest medical cannabis may help reduce agitation in certain people, but results vary. A specialist will assess whether it’s appropriate based on each individual patient’s symptoms and overall health.
Does medical cannabis improve memory or slow dementia?
No. Current evidence does not show that cannabis can slow dementia or improve memory.
Is medical cannabis safe for older adults?
Older adults may be more sensitive to side effects of medical cannabis, such as drowsiness or dizziness. This is why close monitoring is important.
Will medical cannabis make someone sleepy or confused?
Cannabis can cause drowsiness in some cases. If this happens, the clinician may adjust the dose or type of product.
Can medical cannabis be used alongside dementia medicines?
Sometimes, yes. A specialist will assess potential interactions before prescribing any new medication.
Is medical cannabis available on the NHS?
NHS prescriptions are very rare. Most people who pursue this treatment do so through private clinics.
How quickly might we see a change in symptoms?
Some people notice changes within a few weeks, while others need more time. Regular follow-ups help track progress.
Do we need a referral to explore medical cannabis treatment?
A referral is not always needed for private clinics, but sharing medical records helps the specialist make a safe and informed plan.
Closing: Patient Choice & Supportive Care
Exploring medical cannabis is a personal decision, and there’s no pressure to move forward quickly. A conversation with a specialist helps you understand your options and what to expect.
Every person with dementia has different needs. With the support of a qualified clinician, families can decide whether medical cannabis may have a role alongside other approaches to care. Your comfort, safety, and wellbeing remain the focus at every step.
Resources
- Ravelli A, Ceolin C, Papa MV, Vergadoro M, Devita M, De Rui M, Simioni P, Sergi G, Coin A. Can cannabinoids alleviate behavioral symptoms in older adults with dementia? A systematic review. J Psychopharmacol. 2025 Oct 1:2698811251375895. doi: 10.1177/02698811251375895. Epub ahead of print. PMID: 41035223. ↩︎
- Bahji, A., Breward, N., Duff, W. et al. Cannabinoids in the management of behavioral, psychological, and motor symptoms of neurocognitive disorders: a mixed studies systematic review. J Cannabis Res 4, 11 (2022). https://doi.org/10.1186/s42238-022-00119-y ↩︎
- Bosnjak Kuharic D, Markovic D, Brkovic T, Jeric Kegalj M, Rubic Z, Vuica Vukasovic A, Jeroncic A, Puljak L. Cannabinoids for the treatment of dementia. Cochrane Database of Systematic Reviews 2021, Issue 9. Art. No.: CD012820. DOI: 10.1002/14651858.CD012820.pub2. Accessed 11 December 2025. ↩︎
- Pautex, S., Bianchi, F., et al., Cannabinoids for Behavioral Symptoms in Severe Dementia: Safety and Feasibility in a Long-Term Pilot Observational Study in Nineteen Patients. Frontiers in Aging Neuroscience 14 (2022). DOI: 10.3389/fnagi.2022.957665 | ISSN: 1663-4365. ↩︎
- Hermush, V., Ore, L., et al. Effects of Rich Cannabidiol Oil on Behavioral Disturbances in Patients with Dementia: A Placebo-Controlled Randomized Clinical Trial. Frontiers in Medicine 9 (2022). DOI: 10.3389/fmed.2022.951889 | ISSN: 2296-858X. ↩︎
- Rosenberg, PB.; Amjad, H, et. al., A Randomized Controlled Trial of the Safety and Efficacy of Dronabinol for Agitation in Alzheimer’s Disease. The American Journal of Geriatric Psychiatry, 2025. DOI: 10.1016/j.jagp.2025.10.011 | ISSN: 1064-7481. ↩︎
- Herrmann, Nathan; et al. Randomized Placebo-Controlled Trial of Nabilone for Agitation in Alzheimer’s Disease. The American Journal of Geriatric Psychiatry 27(11): 1161–1173. ↩︎