“Moderate to strong correlations were found between marijuana use and inattentive symptoms in men, and marijuana use and decreased sleep quality in women. Men and women with ADHD may use marijuana for different reasons.”

- The study 'Marijuana use is associated with inattention in men and sleep quality in women with Attention-Deficit/Hyperactivity Disorder: A preliminary study' published in the journal Psychiatry Research, September 2013 which assessed 56 men and 20 women with ADHD ages 18 to 45.

There is more than enough pre-clinical evidence to thoroughly support the necessity for this work. Scientific research supporting the use of cannabis to treat ADHD includes decades of case studies and research papers documenting the human experience, as well as in vivo animal studies using ADHD rodents.

You can read more about some of the research into treating ADHD with cannabis that has already been completed and also watch this video interview with Dr. David Bearman (including transcript). A summary of two more case studies is here. You can also read a very comprehensive look at the research base surrounding Racing Brain Syndrome which is a common symptom associated with ADHD.

"There must be well over 100 [peer-reviewed] articles regarding the benefit of cannabis and cannabinoids for ADHD."

– David Bearman, MD and Expert witness (USA, 2015)

Some more examples include:

- The case study Cannabis improves symptoms of ADHD which observes vast improvement in the symptoms of an ADHD sufferer post-cannabis-use.

- The in vivo study report titled "Cannabinoids effective in animal model of hyperactivity disorder"  that found...

"The administration of a synthetic cannabinoid that – like THC – binds to the CB1 receptor normalized the impulsive behavioural profile in this subgroup of SHR rats, but had no effect on normal rats."

- The documents ICRS_2009_ADHD.pdf and Abstract Hannovre brochure 9-11 oct 2008 provide overviews of the science.

- ADHD_Treating_Yourself_mag_2009.pdf also provides an in-depth look at the science.

- ADHD cannabinoids Patients Biblio_web.pdf contains a vast amount of scientific research on the topic.

These are just a fraction of the plethora of research into this area. If you type “Cannabis and ADHD” into Google or any medical research database such as Pub Med you'll be overwhelmed with further research into this area (e.g., the study described at, though you will need to wade through a mass of hysteria-based studies about drug-abuse to find them.

“When asked about the ADHD symptoms they have experienced when not using cannabis, a higher proportion of daily users met symptom criteria for an ADHD diagnoses of the subtypes that include hyperactive–impulsive symptoms than the inattentive subtype. For nondaily users, the proportions of users meeting symptom criteria did not differ by subtype. These results have implications for identifying which individuals with ADHD might be more likely to self-medicate using cannabis. Furthermore, these findings indirectly support research linking relevant cannabinoid receptors to regulatory control.”

- The study 'Subtypes of Attention Deficit-Hyperactivity Disorder (ADHD) and Cannabis Use' published by Substance Use and Misuse online in October in 2013 which entailed a survey of 2811 current marijuana users

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