A large-scale study from Australia suggests that patients using medicinal cannabis experience sustained relief from symptoms such as pain, fatigue, anxiety, and sleep problems. This improvement remained stable in many participants, even a year after starting treatment.
The data builds on earlier short-term findings, but is now strengthened by long-term observations. Although there was no control group, the consistency in observations shows a clear pattern. This makes it relevant for both practitioners and policymakers seeking alternatives for persistent chronic conditions.
The 5 Key Takeaways
- Medicinal cannabis contributes to sustained improvement in quality of life, particularly in the areas of sleep and energy.
- Patients with chronic pain, insomnia, anxiety, and depressive symptoms report experiencing long-term improvement.
- The QUEST initiative followed participants for twelve months. The outcomes are based on structured and repeated measurements.
- Symptom relief persisted throughout the year in a large group, even without dosage adjustments.
- When used correctly, medicinal cannabis can enhance overall resilience and daily functioning.
Long-Term Benefits of Medicinal Cannabis Examined
The study shows that the most reported gain is in overall health experience, often referred to as HRQL — an abbreviation for health-related quality of life. Beyond physical improvements, researchers also observed improvements in sleep, mood, and mental well-being.
The study was published on April 2, 2025, in the open-access journal PLOS ONE. Led by Margaret-Ann Tait (University of Sydney), the team followed a large group of participants with diverse chronic conditions. Participants reported not only general improvement but also reduction in specific symptoms such as panic, worry, and pain in the back or joints.
In 2016, it became legally possible in Australia to use medicinal cannabis by doctor’s prescription. Since then, over a million people have gained access to it, particularly when standard treatments proved insufficient.
The QUEST Study: Long-Term Results Mapped Out
The QUEST initiative (QUality of life Evaluation STudy) followed thousands of adults with a chronic condition who were first prescribed medicinal cannabis oil between late 2020 and late 2021. It was a large-scale study, conducted across multiple sites, in which researchers examined what changes in daily functioning occur when people start long-term therapy with this form of treatment.
The goal was to determine whether early improvements, as reported after three months, would also persist over a one-year period. Tait and her colleagues systematically collected follow-up data from thousands of participants. Although not everyone completed all measurements, a large group was still included in the final analysis.
Of the original 2,744 participants, 2,353 provided usable follow-up data. One year later, this number had declined to 778 people. Despite this attrition, the study provided sufficient basis to analyze trends in symptom progression, HRQL, and the degree of functional improvement.
The questionnaires completed by participants focused on specific symptoms identified by a physician. This included physical discomfort, cognitive functioning, emotional balance, and social interaction — all factors related to the concept of health-related quality of life.
Sustained Symptom Improvement and Better Quality of Life
The results confirm what was previously suspected: in a large number of participants, positive effects persisted for twelve months. This applied to diverse symptoms such as fatigue, pain, and sleep disorders. Mental symptoms — including anxiety, depressive feelings, and sleep problems — also appeared to be less intense long-term.
In specific diagnostic groups, improvement was also reported in overall health experience. Patients with post-traumatic stress disorder (PTSD), chronic pain, insomnia, or anxiety disorders reported feeling more resilient, with a higher level of daily functioning.
There were also nuances. For example, people with movement disorders did see improvement in their perception of health, but their scores in arm function remained roughly the same. This suggests that some limitations may be less responsive to the effects of medicinal cannabis.
Nevertheless, the central conclusion is clear: in a realistic setting, with diverse conditions and without experimental intervention, the data show a compelling picture of stable improvement. This makes this study valuable for both clinical practice and policy-making.
Glossary
- Medicinal cannabis: Cannabis used by doctor’s prescription for medical conditions.
- HRQL: Abbreviation for health-related quality of life. Encompasses physical, emotional, social, and cognitive functions.
- Prospective study: A study in which participants are followed over time to observe changes in health.
- Analgesic properties: Properties of a substance that can relieve pain.
- Chronic conditions: Health problems that are long-lasting and do not resolve on their own.
A Realistic Picture with Caveats
The study was large-scale and accommodated diverse chronic conditions and living circumstances. The results therefore do not come from an artificial laboratory environment, but from situations comparable to the daily lives of many patients. This makes the outcomes useful for practitioners.
However, there are also limitations. No control group was included, so it cannot be said with certainty that the observed changes are solely due to the use of medicinal cannabis. Other factors may have played a role, such as lifestyle, expectations, or additional treatments.
Nevertheless, the consistent improvement in pain, sleep, mood, and overall resilience points to a therapeutic effect worthy of further investigation. For many people, moreover, the benefits appear to be noticeable fairly quickly after starting — and for some, these benefits remain stable long-term.
According to the researchers, this provides valuable input for further decision-making in medical practice and policy. The study contributes to a growing body of evidence about what medicinal cannabis can mean in the long term for people who previously had little benefit from standard medication.
A Hopeful Future for Chronic Patients
The researchers summarize their conclusion as follows:
“This is promising news for patients who do not respond to conventional medicines for these conditions.”
Verified Sources
- Improvements in health-related quality of life are maintained long-term in patients prescribed medicinal cannabis in Australia: The QUEST Initiative 12-month follow-up observational study” – April 2, 2025
- With thanks to SciTechDaily
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Frequently Asked Questions
What are the benefits of medicinal cannabis?
Medicinal cannabis can help reduce pain, fatigue, insomnia, anxiety, and depression. It can improve your overall quality of life.
Is medicinal cannabis safe?
Like any medication, there are possible side effects. Always consult with your doctor to determine if medicinal cannabis is right for you.
What conditions can medicinal cannabis be used for?
Medicinal cannabis can be used for a wide range of conditions, including chronic pain, anxiety, depression, and insomnia. It is also used in treating nausea and vomiting resulting from chemotherapy.
How do I get a prescription for medicinal cannabis?
You need a prescription from a qualified physician to obtain medicinal cannabis. Discuss your symptoms and treatment options with your doctor.
Are there restrictions on the use of medicinal cannabis?
Regulations surrounding medicinal cannabis vary by region. It is important to be aware of local laws and regulations.
