When we discuss the 'strength' (or potency) of a given medical cannabis cultivar, it is easy to fall into the trap of simply looking at the THC levels. This is only one part of the picture - but a crucial one, nonetheless.
Contents
For patients new to the world of medical cannabis, there's a lot to understand. The levels of THC and CBD (the two main cannabinoids that influence medical cannabis therapeutic effects) determine the 'strength' of your prescribed cannabis-based treatment options.
All Releaf-prescribed medical cannabis products undergo rigorous testing and quality control to ensure consistent levels of all cannabinoids. This means you can feel confident in the strength of your prescribed medical cannabis flower or oil and can consistently and easily prepare the correct dose for your unique health needs.
Here, we answer:
- How strong is medical cannabis in the UK?
- What determines the strength of medical cannabis?
- And how do doctors decide on the right cannabinoid levels/treatment options for each patient?
How strong is medical cannabis flower in the UK?
When we discuss the 'strength' (or potency) of a given medical cannabis product, it is easy to fall into the trap of simply looking at the THC levels. This is only one part of the picture - but a crucial one, nonetheless.
What THC levels are present in Releaf prescribed cannabis flower?
When talking purely about THC potency, the medical flower options prescribed to Releaf patients start at 7% and top out at 26% THC.
Any cultivar that offers THC levels above 20% THC is considered to be high potency.
Are high-THC treatment options "better"?
Not necessarily. While high-THC products may offer more noticeable psychoactive effects, this does not always translate to a 'stronger' medical outcome.
Some patients, especially those suffering from extreme chronic pain issues and certain other conditions, may require a higher THC potency option. But for others, a lower THC level combined with higher levels of CBD may provide the most benefit.
What determines the strength of medical cannabis?
As mentioned, the strength of medical cannabis treatment options is usually determined by the levels of THC and CBD present. These two therapeutic cannabinoids work together, each influencing the overall effects of the other.
What is CBD?
Cannabidiol, or CBD, is a non-intoxicating (but still somewhat psychoactive, as it can affect mood and perception) cannabinoid. It has been shown to offer a range of therapeutic effects - from pain relief and anti-inflammatory properties to anxiety and seizure control.
Is CBD important in medical cannabis treatment?
Yes, even more so than THC for some patients. CBD has been found to have a balancing effect on the psychoactive effects of THC and offers many therapeutic benefits of its own. When cannabinoids (and terpenes) are taken together, they offer what is known as the 'entourage effect' - where the combined therapeutic effects are greater than the sum of their individual parts.
What CBD levels are present in Releaf prescribed cannabis flower?
That depends on the cultivar. Many options offer around 1% to 2% CBD (considered to be low to mid-strength CBD potency), with some options reaching the 10% CBD mark (considered high-potency CBD).
The balanced flower options currently available for prescription to Releaf patients offer 7% THC and 7% CBD.
How do doctors decide on the right treatment options for each patient?
Releaf has a world-class clinical team made up of more than 25 specialists. All of our specialists have extensive experience in prescribing medical cannabis, and come from a wide range of medical backgrounds, including neurology, pain management and psychiatry.
When it comes to determining the right best-suited treatment option/s for each patient, our specialists take a personalised approach.
During your initial consultation, your specialist will take all the time needed to thoroughly review your medical documentation whilst also chatting with you to understand your unique symptoms, treatment goals, and lifestyle.
Using this information, our specialists will create a personalised treatment plan for you, and will discuss all the potential treatment options available to you.
Final thoughts
Medical cannabis treatment with Releaf focuses on treating each patient as an individual. This means looking beyond just the THC levels and considering all factors that may contribute to a successful treatment plan.
Our specialists are dedicated to providing the best possible care for our patients and will continually monitor and adjust treatment plans based on progress and feedback from you, the patient.
If, at any time, you feel that your current treatment plan is not meeting your needs, please do not hesitate to contact our team for support and guidance.
Want to learn more?
Head to our fast and free medical cannabis eligibility checker, and check out the rest of our New Patient blog series, which includes:
Share article
Did you like this article?
It is important to seek medical advice before starting any new treatments. The patient advisors at Releaf are available to provide expert advice and support. Alternatively, click here to book a consultation with one of our specialist doctors.
Elevate your wellness with medical cannabis
Get comprehensive care, convenience, and confidence with an all-in-one treatment plan.
Am I eligible?Authors
Sam North, a seasoned writer with over five years' experience and expertise in medicinal cannabis, brings clarity to complex concepts, focusing on education and informed use.
Editorial Policy
All of our articles are written by medical cannabis experts, guided by strict sourcing guidelines, and reference peer-reviewed studies and credible academic research. Our expert clinical team and compliance specialists provide valuable insights to ensure accuracy when required. Learn more in our editorial policy.
Need more help?
Blog Categories
Further reading
Women’s History Month: Celebrating women’s contributions to medicine and science
Women’s History Month takes place every March, offering an opportunity to celebrate the important contributions of women to societies around the world. From scientific discoveries and life-changing inventions to driving social change, women have always played a vital role in the betterment of society. However, their achievements have so often been unrecognised and uncredited. So, in honour of Women’s History Month, we’re celebrating women’s contributions to medicine and science. **
How UK medical cannabis delivery works (and why delays sometimes happen) in 2026
Medical cannabis delivery in the UK follows strict legal safeguards. Most prescriptions arrive within 2 to 5 working days, but compliance rules and courier regulations can occasionally extend timelines. Here’s how the process works, why licensed couriers are required, and what happens if a delivery is missed.
International Day of Women and Girls in Science: Building inclusive futures
The International Day of Women and Girls in Science is an important date in the ongoing movement to end the Gender Gap. Despite still being a minority in many fields, women have made some of the most influential contributions to scientific development and progression in history. In honour of this year’s event, we’re honouring the women and girls who continue to push the boundaries of science and how their contributions are shaping the world of health care.