A study from 2016 worked with 214 people with epilepsy. The study participants added oral doses of 2 to 5mg of CBD per day to their existing anti-epilepsy medications. The study’s researchers monitored the participants for 12 weeks, recording any negative side effects and checking on the frequency of their seizures. Overall, participants had 36.5 percent fewer seizures per month. However, severe adverse effects were recorded in 12 percent of the participants.
The anti-emetic and anti-nausea effect of marijuana is a centuries-old known fact. Nevertheless, as early as twenty years ago, the effect was attributed to the actions of THC. Continuous research into other cannabinoids has proven that many other phytocannabinoids produce the same desired effect. At present, the FDA recommends two drugs featuring cannabinoids, in which CBD has the highest concentration, in the treatment of nausea induced by chemotherapy – nabilone and dronabinol. Though in its infancy, promising studies exist which suggest that one day CBD may be incorporated into cancer therapies.
A study published by David Cheng, Postdoctoral Scientist, Neuroscience Research, University of New South Wales, NSW, Australia, says that CBD has a potential as a preventive measure against symptoms of Alzheimer’s. This presents yet another exciting development for medical researchers, given the persistent challenges to finding effective solutions for this condition.
Does the use of CBD oil have side effects? CBD is a natural substance, a cannabinoid from the cannabis/hemp plant, whose positive properties on the human organism are not only attributed by scientists and physicians but by people all over the world who have experienced its healing and therapeutic abilities. Even though it is a natural substance and because of the fact that we have our own cannabinoid system (endocannabinoid system), it looks as if it has been created for us, nevertheless the question arises whether CBD has side effects. And if so, which one? Under which circumstances? And at what dose?

It’s thought that CBD might affect your health by attaching to receptors in the body’s endocannabinoid system—a complex biological system involved in maintaining certain aspects of your health. Emerging research shows that endocannabinoids may play a role in regulating such functions as memory, sleep, and mood, as well as metabolic processes like energy balance. In addition, CBD oil may play a role in improving a variety of health conditions.


While CBD and marijuana have been used for centuries for many remedies, the role CBD can play in lessening the severity and number of seizures in those diagnosed with epilepsy came into the spotlight in the early 2000’s. That’s when the Figi family began looking for a way to treat their daughter Charlotte’s seizures. At the time, she was suffering upwards of 300 seizures per week. (8)
'If you have a health condition, or are taking any prescribed or over-the-counter medicines, always check with your doctor or a pharmacist for possible drug supplement interactions before taking CBD,' says Dr Brewer. 'This is because CBD interacts with enzymes involved in metabolising some medicines and may result in increased drug levels that could cause side effects.
There are a number of possible side effects to using CBD oil, such as fatigue, dry mouth, lightheadedness, hypotension, and impaired motor functions. However, when used in moderate amounts, most people do not experience these side effects, and none of them are known for being fatal or particularly dangerous. More than 20,000 studies have been done in the past 15 years on cannabis, hemp, and cannabinoids, and the results have been overwhelmingly supportive of the therapeutic potential and viability of CBD oil. That being said, some people should be cautious before using this powerful oil.
There has been a fair amount of confusion surrounding the legality of CBD oil. But while the vast majority of cannabinoids are controlled substances under the Misuse of Drugs Act, rest assured that CBD oil is legal across the UK for medicinal purposes, provided it has been derived from an industrial hemp strain that is EU-approved. These strains contain very little to no THC (the psychoactive cannabinoid).
This content is for informational and educational purposes only. It is not intended to provide medical advice or to take the place of medical advice or treatment from a personal physician. All viewers of this content are advised to consult their doctors or qualified health professionals regarding specific health questions. Neither Dr. Axe nor the publisher of this content takes responsibility for possible health consequences of any person or persons reading or following the information in this educational content. All viewers of this content, especially those taking prescription or over-the-counter medications, should consult their physicians before beginning any nutrition, supplement or lifestyle program.
Putting this in perspective, eating a portion of grapefruit would have a similar effect on the aforementioned liver enzymes. So neutralizing P450 enzymes should be viewed as a minor side effect of cannabidiol. However, if you are taking pharmaceutical drugs and wish to take CBD, you should discuss any potential complications regarding reduced P450 enzyme activity with your doctor and/or pharmacist.
According to the largest study to date, researchers reported that after treating 162 patients with an extract of 99% cannabidiol (CBD), for a 12 week period. the intervention reduced motor seizures at a rate similar to existing drugs ( a median of 36.5 percent) and 2% of patients became completely seizure free. Other studies have shown that it can act as an anticonvulsant.
Our bodies are thought to produce endocannabinoids by the billions every day. “We always thought the ‘runner’s high’ was due to the release of dopamine and endorphins. But now we know the euphoria is also from an endocannabinoid called anandamide,” its name derived from the Sanskrit word for bliss, says Joseph Maroon, MD, clinical professor and vice chairman of neurosurgery at the University of Pittsburgh Medical Center. We produce these natural chemicals all day, but they fade quickly because enzymes pop up to destroy them. That’s where CBD comes in: By blocking these enzymes, CBD allows the beneficial compounds to linger.
People who experience psychosis may produce too much or even too little cannabinoids (from overactive dopamine receptors). CBD is milder than our internal cannabinoids and helps to re-establish a balance of cannabinoids in the brain. CBD also helps lower inflammation, which is often increased in schizophrenia. THC, on the other hand, is stronger than our internal cannabinoids (anandamide and 2-AG), this way potentially triggering psychosis [46, 48]. 
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