Medical Cannabis for Multiple Sclerosis in Canada

Living with Multiple Sclerosis (MS) presents unique challenges that affect nearly every aspect of daily life. As a disabling disease affecting and damaging the nerves of the brain and spinal cord, MS can cause a wide range of symptoms that significantly impact mobility, comfort, and overall quality of life.

Multiple Sclerosis is characterized by the immune system mistakenly attacking the protective covering of nerve fibres, disrupting communication between the brain and the rest of the body. This damage can lead to numerous physical and cognitive symptoms that vary widely from person to person.

Many Canadians with MS find that traditional treatments don’t always provide complete relief or come with unwanted side effects. Medicinal cannabis can help by reducing body pain, as well as aid with sleep and other symptoms. For many patients, cannabis represents an opportunity to start living with less pain and improved symptom management.

Modern science is still working on discovering the exact cause of MS, but research indicates a combination of environmental and genetic risks being at play. MS can occur at any age, being more prevalent in women and affecting them three times as often as men.

It is estimated that 100,000 Canadians are living with MS and that 1,000 new cases are diagnosed each year. Canada has one of the highest rates of multiple sclerosis in the world, with the disease affecting approximately 1 in 400 Canadians.

It must be noted, however, that the process of getting diagnosed with MS can be slow as doctors wait for evidence to build in the patient. Diagnosis typically involves a combination of clinical evaluations, MRI imaging, spinal fluid analysis, and sometimes evoked potential tests that measure electrical activity in response to stimulation.

Multiple Sclerosis can cause a wide range of symptoms that vary significantly between individuals and may change or fluctuate over time:

Physical Symptoms

• Fatigue (affecting up to 80% of people with MS)
• Difficulty walking
• Muscle weakness or spasms
• Numbness or tingling in limbs
• Balance problems and dizziness
• Vision problems (blurred vision, double vision, or vision loss)
• Pain (both neuropathic and musculoskeletal)
• Tremors
• Speech difficulties
• Bladder and bowel dysfunction
• Sexual dysfunction

Cognitive and Emotional Symptoms

• Memory problems
• Attention and concentration difficulties
• Information processing speed challenges
• Depression and anxiety
• Mood swings
• Sleep disturbances

MS typically follows one of several patterns or “courses”:

– Relapsing-remitting MS (RRMS): Clearly defined attacks followed by periods of recovery

– Secondary-progressive MS (SPMS): Initially relapsing-remitting, followed by a steady progression

– Primary-progressive MS (PPMS): Steady worsening of symptoms from onset, without relapses

– Progressive-relapsing MS (PRMS): Progressive from the beginning with acute relapses

Living with these symptoms can significantly impact employment, relationships, independence, and overall quality of life.

Research into cannabis for MS has shown promising results. Controlled studies have shown medical marijuana to improve muscle stiffness, body pain, quality of sleep, and especially spasticity. Its analgesic effects can also help MS patients with instances of abdominal pain or nausea.

The effectiveness of cannabis for MS may be linked to how it interacts with the body’s endocannabinoid system:

1. Anti-inflammatory effects: Cannabinoids may help reduce the inflammation associated with MS
2. Neuroprotective properties: Some research suggests cannabinoids may protect neurons from damage
3. Muscle relaxation: Cannabis compounds can help reduce muscle spasticity and related pain
4. Pain modulation: Cannabinoids interact with receptors involved in pain perception and transmission
5. Sleep improvement: Cannabis can help improve sleep quality, which is often disrupted in MS

Several clinical trials have evaluated cannabis-based medicines for MS, including a pharmaceutical preparation called Sativex (nabiximols), which is approved in Canada specifically for MS-related spasticity. The CAMS (Cannabinoids in Multiple Sclerosis) study and others have found benefits for pain, spasticity, sleep, and quality of life measures.

For Canadians struggling with Multiple Sclerosis, medical cannabis may offer several potential benefits:

Primary Symptom Management

Many patients report improvements in core MS symptoms, including:

• Reduced spasticity and muscle stiffness
• Decreased pain (both neuropathic and musculoskeletal)
• Improved sleep quality and duration
• Better bladder control
• Reduced tremors
• Less fatigue
• Improved mood and reduced anxiety

Complementary Therapy

Others find cannabis helpful as a complementary treatment to address the limitations or side effects of conventional MS treatments:

• Alternative for those who cannot tolerate muscle relaxants
• Reduced reliance on opioid pain medications
• Management of side effects from disease-modifying therapies
• Support during periods of symptom flare-up