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Prescription CBD Oil Chris Aiken, MD Editor-in-Chief of The Carlat Psychiatry Report . Practicing psychiatrist, Winston-Salem, NC. Dr. Aiken has disclosed that he has no relevant CaM is frequently used as a substitute for prescription drugs, particularly opioids. More research is needed on the long-term consequences of use of CaM, including the impact from low and high THC cannabis products on specific somatic and mental health conditions.

Prescription CBD Oil

Chris Aiken, MD

Editor-in-Chief of The Carlat Psychiatry Report. Practicing psychiatrist, Winston-Salem, NC.

Dr. Aiken has disclosed that he has no relevant financial or other interests in any commercial companies pertaining to this educational activity.

Your patient comes in with a new medication on his list: CBD oil. He started taking it for anxiety and wants to know if it’s safe. You hedge, explaining that there is limited information available on unregulated products, but the patient is persistent. He says CBD oil is available as a prescription, and wonders if you could write one for it.

Cannabidiol, or CBD, is a derivative of marijuana that has recently become available as a prescription drug, Epidiolex. It is FDA-approved for two rare forms of childhood epilepsy, Lennox-Gastaut and Dravet syndromes, and was fast-tracked for that indication because of the dire need for treatment in children with these intractable seizures. Meanwhile, the same drug has been available as a supplement for the past decade, called CBD oil. Many patients take this oil for its rumored mental health benefits, and you’ll need to know the basics when they request prescriptions for it.

Table: Cannabinoids From CBD to THC

CBD vs THC
Marijuana (cannabis) is a blend of over 100 cannabinoids, only one of which is tetrahydrocannabinol (THC), the cannabinoid that is most responsible for the high people get from consuming pot. CBD, on the other hand, does not cause a “high,” although many people consider it to be somewhat tranquilizing. CBD also does not cause some of the problems seen with THC, such as cognitive impairment, anxiety, and (more rarely) psychosis. Those dangers are particularly relevant to adolescents, where the latest data show that marijuana triples the risk of psychotic disorders (Jones HJ et al, JAMA Psych 2018;75(3):240–246). CBD has neuroprotective properties, and it may actually lower the risk of psychosis and anxiety with THC. For more information, see the table “Cannabinoids From CBD to THC” above.

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CBD in psychiatric disorders
In one of the most paradoxical clinical findings in recent memory, it turns out that CBD, far from causing psychosis, may actually be an effective treatment for psychosis. So far, 5 out of 7 controlled trials of CBD’s antipsychotic effects have been positive, and the latest of these is reviewed in this issue (Epidemiol Psychiatr Sci 2018;27(4):327–335). Another prescription CBD product, Arvisol, is undergoing phase I clinical trials in schizophrenia.

In addition to psychosis, there are a couple of small, placebo-controlled trials of CBD in social anxiety disorder. These looked at the drug’s acute effects when taken before a stressful social situation in 34 subjects. Compared to placebo, CBD had a significant effect, bringing anxiety down to the same levels reported by healthy controls (Blessing EM et al, Neurotherapeutics 2015;12(4):825–836).

Somnolence is the main side effect with CBD, but studies in sleep are mixed. Tolerance can develop to its sedative effects, and low doses (below 160 mg) can be stimulating (Babson KA, Curr Psychiatry Rep 2017;19(4):23). CBD does not appear to help bipolar mania or the cognitive impairments of schizophrenia.

CBD oil or Epidiolex?
Are CBD oil and Epidiolex really the same drug? They are both CBD, short for cannabidiol, but where they differ is in their purity and regulatory status. Epidiolex is a Schedule V prescription drug, the lowest level of regulation for a controlled substance. CBD oil is an ­over-the-counter supplement. It is legal in all states as long as it’s extracted from the hemp plant, a variety of cannabis that contains little THC and produces no high.

In terms of purity, CBD oil is a gamble. In a study of 84 online products, only 30% contained the amount of CBD on the label, and 21% contained THC (Bonn-Miller MO et al, JAMA 2017;318(17):1708–1709). The FDA keeps a running tally of unacceptable products at www.fda.gov/NewsEvents/PublicHealthFocus/ucm484109.htm. Another good source is Consumer Labs, which tests products for purity and integrity. Among their recommended options, the best-priced oils are available at elixinol.com and bluebirdbotanicals.com.

The dosages used in psychiatric research range from 300 mg/day for anxiety to 800–1,200 mg/day for schizophrenia. The epilepsy dosage, 10–20 mg/kg/day, adds up to around the same amount used in schizophrenia for most adults. Cost is an issue with CBD, prescribed or not. A 300 mg dose is $20–50/day in the over-the-counter form and around $35/day for the prescription when paying out of pocket.

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CBD, Marinol, and medical marijuana
CBD is in a very different category than dronabinol (Marinol) and nabilone (Cesamet), the other prescription cannabinoids. These are synthetic isomers of THC (Δ-9-THC) and are under tighter regulation than CBD (Schedule III vs Schedule V). They are only approved for nausea during chemotherapy and, in the case of dronabinol, anorexia in AIDS. As pure THC compounds without the protective effects of CBD, they may have even more psychedelic effects than marijuana (Bhattacharyya S et al, Neuropsychopharm 2010;35(3):764–774). “Medical marijuana” can refer to any marijuana component, such as CBD, or to the plant itself. It usually refers to the plant, which is legal with a prescription in 33 states and Washington DC. Each state has its own list of conditions that medical marijuana is approved for.

Side effects and drug interactions
The World Health Organization concluded that CBD has “a good safety profile” (WHO, 2018). Somnolence is its main side effect, and the PDR warns of elevated liver enzymes. On drug screens, CBD can cause a false positive for THC.

CBD may raise the levels of psychiatric medications through inhibition at UGT2B7 (lamotrigine, lorazepam) and CYP2C19 (diazepam and several SSRIs and antipsychotics). CBD itself is metabolized by CYP3A4 and CYP2C19.

Risks vs benefits
The FDA fast-tracked the approval of Epidiolex (CBD) because its risk-benefit profile is favorable for rare forms of epilepsy that are difficult to control with current anticonvulsants. The bar is higher for disorders with existing treatments, like psychosis and anxiety, and the data in these conditions are scarcer.

While we sort out these dilemmas, patients will no doubt experiment with the readily available CBD oil, so what should we do in the interim? We recommend the following commonsense approach.

TCPR Verdict: We don’t have much evidence to endorse or warn against CBD. Though it’s premature to prescribe CBD, we should guide patients to safer products if they are getting it on their own. That’s harm reduction, like suggesting to casual drinkers that red wine is safer than vodka

Exploring the use of cannabis as a substitute for prescription drugs in a convenience sample

Background: The use of cannabis as medicine (CaM) both prescribed and non-prescribed has increased markedly in the last decade, mirrored in a global shift in cannabis policy towards a more permissive stance. There is some evidence that cannabis functions as a substitute for prescription drugs, particularly opioids; however, more knowledge is needed on the motives of substitution users, their patterns of use, and perceived effects of substitution use.

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Aims: To explore who substitutes prescription drugs with cannabis, the type of prescription drugs substituted and the type of cannabis used, and the impact that substitution with cannabis has on prescription drug use as well as the motives for substitution in terms of experienced effects and side effects.

Methods: A self-selected convenience sample was recruited through social media, public media, and patient organizations to take part in an anonymous online survey. Inclusion criteria were 18 years or older and use of cannabis (prescribed or non-prescribed) with a medical purpose.

Results: The final sample included 2.841 respondents of which the majority (91%) used non-prescribed cannabis, and more than half (54.6%) had used CaM with the purpose of replacing a prescribed drug. Compared to non-substitution users, substitution users were more likely to be women and to use CaM in the treatment of chronic pain and other somatic conditions. Pain medication (67.2%), antidepressants (24.5%), and arthritis medication (20.7%) were the most common types of drugs replaced with CaM. Among substitution users, 38.1% reported termination of prescription drug use, and 45.9% a substantial decrease in prescription drug use. The most frequent type of cannabis used as a substitute was CBD-oil (65.2%), followed by ‘hash, pot or skunk’ (36.6%). More than half (65.8%) found CaM much more effective compared to prescription drugs, and 85.5% that the side effects associated with prescription drug use were much worse compared to use of CaM.

Conclusion: CaM is frequently used as a substitute for prescription drugs, particularly opioids. More research is needed on the long-term consequences of use of CaM, including the impact from low and high THC cannabis products on specific somatic and mental health conditions.

Keywords: Cannabidiol; Medical cannabis; Opioid use; Prescription drugs; Substitution.

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