ALS Research: Marijuana May Work Better Than Current Treatments

ALS researcher
Emerging evidence indicates that marijuana-based therapies may be more effective than existing FDA-approved medications in treating amyotrophic lateral sclerosis (ALS), a rapidly progressing neurodegenerative disease. Current treatments, Rilutek (riluzole) and Radicava (edaravone), have shown limited effectiveness and come with side effects. In contrast, research from 2004 suggests that THC, a compound found in marijuana, significantly slows the disease process and could potentially extend the life of ALS patients by three years or more. This is supported by subsequent studies, and scientists are advocating for further research into the effects of marijuana on ALS, despite potential funding limitations due to its federal status.
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Growing evidence suggests marijuana-based therapies may work better than current FDA-approved medication in treating amyotrophic lateral sclerosis (ALS).

What is ALS?

Also known as Lou Gehrig’s disease, ALS is a rapidly progressive neurodegenerative disease that affects nerve cells in the brain and spinal cord. Symptoms include weakness, spasticity (a condition where muscles are continuously contracted), and paralysis. According to the ALS Association, the average survival time with ALS is three to five years.

Current ALS treatments

Until recently, there was only one FDA-approved medication for ALS: Rilutek (riluzole). In March 2017, the FDA announced a second: Radicava (edaravone).

Clinical trials show riluzole increases ALS survival by two to three months. However, the drug does not improve muscle strength or neurological function; side effects include nausea and weakness.

Clinical trails for edaravone show treatment reduces disability progression in ALS patients; side effects include walking problems, headaches, and bruises.

Marijuana and ALS research

In 2004, researchers reported that THC (a chemical compound found in marijuana, known as a cannabinoid) may effectively treat ALS:

Our research indicates that select marijuana compounds, including THC, significantly slow the disease process and extend the life of mice with ALS.

In an astonishing announcement, study author Dr. Mary Abood revealed:

The only FDA approved drug for ALS, riluzole, extends life on average by about two months. Evidence from our study suggests that a marijuana-based therapy could create a much greater effect, perhaps extending life by three years or more.

Follow-up studies support Abood’s claim, with a number of journals reporting similar results:

These results show that cannabinoids have significant neuroprotective effects in this model of ALS.

Source: Federation of American Societies for Experimental Biology, 2006

Daily injections of the selective CB2 [cannabinoid receptor] agonist AM-1241, initiated at symptom onset, increase the survival interval after [ALS] disease onset by 56%.

Source: Journal of Neurochemistry, 2010

Treatment with [cannabinoid receptor agonist] AM1241 was effective at slowing signs of disease progression when administered after onset of signs in an ALS mouse model […] As AM1241 was well tolerated by the animals, cannabinoid CB2 receptor-selective compounds may be the basis for developing new drugs for the treatment of ALS and other chronic neurodegenerative diseases.

Source: European Journal of Pharmacology, 2006

Administration at the onset of tremors delayed motor impairment and prolonged [ALS] survival in THC treated mice when compared to vehicle controls.

Source: World Federation of Neurology Research Group on Motor Neuron Diseases, 2004

How does marijuana help ALS?

ALS is an extremely complex disease, affecting a wide-range of physiological factors (including axonal transport, mitochondrial damage, and protein aggregation) – meaning any effective treatment will need to do a number of different things. For this reason, as researchers note in Current Pharmaceutical Design:

It is becoming an increasing widely held view that “cocktail” or “combination” therapies will be necessary if a disease modifying therapy for ALS is to be developed.

Fortunately, marijuana seems to offer an all-in-one solution. According to a recent study published by Rehabilitation Medicine and Palliative Care:

Ideally, a multi-drug regimen, including glutamate antagonists, antioxidants, a centrally acting anti-inflammatory agent, microglial cell modulators (including tumor necrosis factor alpha [TNF-a] inhibitors), an antiapoptotic agent, one or more neurotrophic growth factors, and a mitochondrial function-enhancing agent would be required to comprehensively address the known pathophysiology of ALS. Remarkably, cannabis appears to have activity in all of those areas. Preclinical data indicate that cannabis has powerful antioxidative, anti-inflammatory, and neuroprotective effects.

What’s next?

Scientists are calling for additional research exploring the effect of marijuana on ALS:

In view of the increasing body of evidence that demonstrates the neuroprotective potential of the endocannabinoid system in ALS, a full investigation of the therapeutic potential of these agents in ALS is now justified.

Unfortunately, funding is likely to be limited given marijuana’s current status as a federally prohibited substance.

Updated: April 19, 2024

Jessica Walters

Jessica Walters serves as CannaMD's Chief Medical Researcher. Prior to her time at CannaMD, Jessica earned her degree from Harvard where she focused on neuropsychology. Her personal research interests include psychosocial interventions for obesity, depression, and generalized anxiety disorders.


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