Cannabidiol

Template:Short description Template:Distinguish Template:Use mdy dates Template:Cs1 config Template:Main other {{#invoke:Infobox|infobox}}Template:Template other{{#invoke:TemplatePar |check |template=Template:Infobox_drug |all= |opt= pronounce= pronounce_ref= pronounce_comment= ATC_prefix= ATC_suffix= ATC_supplemental= ATCvet= biosimilars= CAS_number_Ref= CAS_number= CAS_supplemental= ChEBI= ChEBI_Ref= ChEMBL_Ref= ChEMBL= ChemSpiderID= ChemSpiderID_Ref= chirality= class= container_only= DailyMedID= data_page= DrugBank_Ref= DrugBank= Drugs.com= duration_of_action= INN= INN_EMA= IUPAC_name= IUPHAR_ligand= KEGG_Ref= KEGG= MedlinePlus= NIAID_ChemDB= PDB_ligand= PubChemSubstance= PubChem= StdInChIKey_Ref= StdInChIKey= StdInChI_Ref= StdInChI_comment= StdInChI= UNII_Ref= UNII= DTXSID= Verifiedfields= Watchedfields= addiction_liability= alt2= altL= altR= alt= bioavailability= boiling_high= boiling_notes= boiling_point= captionLR= caption= caption2= charge= chemical_formula= chemical_formula_ref= chemical_formula_comment= class1= class2= class3= class4= class5= class6= component1= component2= component3= component4= component5= component6= density= density_notes= dependency_liability= drug_name= elimination_half-life= engvar= excretion= image2= imageL= imageR= image= image_class= image_class2= image_classL= image_classR= Jmol= legal_AU= legal_BR= legal_CA= legal_DE= legal_EU= legal_NZ= legal_UK= legal_UN= legal_US= legal_AU_comment= legal_BR_comment= legal_CA_comment= legal_DE_comment= legal_UK_comment= legal_NZ_comment= legal_US_comment= legal_UN_comment= legal_EU_comment= legal_status= licence_CA= licence_EU= licence_US= license_CA= license_EU= license_US= mab_type= melting_high= melting_notes= melting_point= metabolism= metabolites= molecular_weight= molecular_weight_round= molecular_weight_unit= molecular_weight_ref= molecular_weight_comment= onset= pregnancy_AU= pregnancy_AU_comment= pregnancy_category= protein_bound= routes_of_administration= SMILES= smiles= solubility= sol_units= source= specific_rotation= synonyms= target= tradename= type= vaccine_type= verifiedrevid= width2= widthL= widthR= width= AAN= BAN= JAN= USAN= source_tissues= target_tissues= receptors= agonists= antagonists= precursor= biosynthesis= gt_target_gene= gt_vector= gt_nucleic_acid_type= gt_editing_method= gt_delivery_method= sec_combustion= Ac=Ag=Al=Am=Ar=As=At=Au=B=Ba=Be=Bh=Bi=Bk=Br=C=Ca=Cd=Ce=Cf=Cl=Cm=Cn=Co=Cr=Cs=Cu= D=Db=Ds=Dy=Er=Es=Eu=F=Fe=Fl=Fm=Fr=Ga=Gd=Ge=H=He=Hf=Hg=Ho=Hs=I=In=Ir=K=Kr=La=Li=Lr=Lu=Lv= Mc=Md=Mg=Mn=Mo=Mt=N=Na=Nb=Nd=Ne=Nh=Ni=No=Np=O=Og=Os=P=Pa=Pb=Pd=Pm=Po=Pr=Pt=Pu=Ra=Rb=Re=Rf=Rg=Rh=Rn=Ru=S=Sb=Sc=Se=Sg=Si=Sm=Sn=Sr=Ta=Tb=Tc=Te=Th=Ti=Tl=Tm=Ts=U=V=W=Xe=Y=Yb=Zn=Zr= index_label= index2_label= index_comment= index2_comment= CAS_number2= CAS_supplemental2= ATC_prefix2= ATC_suffix2= ATC_supplemental2= PubChem2= PubChemSubstance2= IUPHAR_ligand2= DrugBank2= ChemSpiderID2= UNII2= KEGG2= ChEBI2= ChEMBL2= PDB_ligand2= NIAID_ChemDB2= SMILES2= smiles2= StdInChI2= StdInChIKey2= CAS_number2_Ref= ChEBI2_Ref= ChEMBL2_Ref= ChemSpiderID2_Ref= DrugBank2_Ref= KEGG2_Ref= StdInChI2_Ref= StdInChIKey2_Ref= UNII2_Ref= DTXSID2= QID= QID2=PLLR= pregnancy_US= pregnancy_US_comment= |cat=Pages using infobox drug with unknown parameters |format=0|errNS=0

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| _other_data=2-[(1R,6R)-6-Isopropenyl-3-methylcyclohex-2-en-1-yl]-5-pentylbenzene-1,3-diol

| _image_0_or_2 = Cannabidiol.svgCBD-3D-balls.png | _image_LR =

| _datapage = Cannabidiol (data page) | _vaccine_target={{#ifeq: | vaccine | | _type_not_vaccine }} | _legal_all=S4Synthetic: C3; Oil with <0,2% THC: B1; Oil <30mg/ml THC and <30mg/ml CBD: A3.UnscheduledGSLRx-onlyUnscheduledRx-onlyRx-onlyTemplate:Cn | _ATC_prefix_supplemental=N03 | _has_EMA_link = | CAS_number=13956-29-1 | PubChem=644019 | ChemSpiderID=559095 | ChEBI=69478 | ChEMBL= | DrugBank=DB09061 | KEGG=D10915 | _hasInChI_or_Key={{#if:1S/C21H30O2/c1-5-6-7-8-16-12-19(22)21(20(23)13-16)18-11-15(4)9-10-17(18)14(2)3/h11-13,17-18,22-23H,2,5-10H2,1,3-4H3/t17-,18+/m0/s1QHMBSVQNZZTUGM-ZWKOTPCHSA-N |yes}} | UNII=19GBJ60SN5 | _hasJmol02 = |_hasMultipleCASnumbers = |_hasMultiplePubChemCIDs = |_hasMultipleChEBIs =

| _countSecondIDs={{#invoke:ParameterCount |main |CAS_number2 |ATC_prefix2 |PubChem2 |PubChemStructure2 |IUPHAR_ligand2 |DrugBank2 |ChemSpiderID2 |UNII2 |KEGG2 |ChEBI2 |ChEMBL2 |PDB_ligand2 |NIAID_ChemDB2 |SMILES2 |smiles2 |StdInChI2 |StdInChIKey2 |DTXCID2}} | _countIndexlabels={{#invoke:ParameterCount |main |index_label |index2_label}} | _trackListSortletter= |QID = |QID2 = |Verifiedfields=verified |Watchedfields=verified |verifiedrevid=457636058}} Template:Cannabis sidebar Cannabidiol (CBD) is a phytocannabinoid, one of 113 identified cannabinoids in Cannabis, along with tetrahydrocannabinol (THC), and accounts for up to 40% of the plant's extract.<ref name="pmid23108553" /> Medically, it is an anticonvulsant used to treat multiple forms of epilepsy.<ref name="Epidiolex FDA label" /> It was discovered in 1940 and, as of 2024 clinical research on CBD included studies related to the treatment of anxiety, addiction, psychosis, movement disorders, and pain, but there is insufficient high-quality evidence that CBD is effective for these conditions.<ref name="kirkland">Template:Cite journal</ref><ref name="black">Template:Cite journal</ref><ref name="mayo">Template:Cite journal</ref><ref>Template:Cite journal</ref> CBD is sold as an herbal dietary supplement and promoted with yet unproven claims of particular therapeutic effects.<ref name=sbm/>

Cannabidiol can be taken internally in multiple ways, including by inhaling cannabis smoke or vapor, swallowing it by mouth, and through use of an aerosol spray into the cheek.<ref name="lipo">Template:Cite journal</ref><ref name="MetaOpinion">Template:Cite journal</ref> It may be supplied as CBD oil containing only CBD as the active ingredient (excluding THC or terpenes), CBD-dominant hemp extract oil, capsules, dried cannabis, or prescription liquid solution.<ref name="Epidiolex FDA label" /><ref name=mayo/> CBD does not have the same psychoactivity as THC,<ref name="pmid28232276" /><ref name="Iseger2015">Template:Cite journal</ref> and can modulate the psychoactive effects of THC on the body if both are present.<ref name="pmid23108553">Template:Cite journal</ref><ref name="pmid28232276">Template:Cite journal</ref><ref name="Boggs">Template:Cite journal</ref><ref name="pmid26836472">Template:Cite journal</ref> Conversion of CBD to THC can occur when CBD is heated to temperatures between 250–300 °C, potentially leading to its partial transformation into THC.<ref name = "Czégény_2021">Template:Cite journal</ref>

In the United States, the cannabidiol drug Epidiolex was approved by the Food and Drug Administration (FDA) in 2018 for the treatment of two seizure disorders.<ref name="Epidiolex FDA label" /> While the 2018 United States Farm Bill removed hemp and hemp extracts (including CBD) from the Controlled Substances Act, the marketing and sale of CBD formulations for medical use or as an ingredient in dietary supplements or manufactured foods remains illegal under FDA regulation, Template:As of.<ref name="Mead 2019">Template:Cite journal</ref><ref name="fdareg-hemp">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Template:TOC limit

Medical uses

Epilepsy

In the United States, the FDA has indicated only one brand of prescription cannabidiol called Epidiolex for the treatment of seizures associated with Dravet syndrome, Lennox–Gastaut syndrome, or tuberous sclerosis complex in people one year of age and older.<ref name="Epidiolex FDA label" /><ref name="Office of the Commissioner_2020" /><ref name=stockings>Template:Cite journal</ref><ref name="Elliott">Template:Cite journal</ref> While Epidiolex treatment is generally well tolerated, it is associated with minor adverse effects, such as gastrointestinal upset, decreased appetite, lethargy, sleepiness, and poor sleep quality.<ref name="Epidiolex FDA label"/><ref name=stockings/><ref>Template:Cite journal</ref><ref name=Elliott/>

In the European Union, Epidyolex is indicated for use as adjunctive therapy of seizures associated with Lennox–Gastaut syndrome or Dravet syndrome, in conjunction with clobazam, for people two years of age and older.<ref name="Epidyolex EPAR">{{#invoke:citation/CS1|citation |CitationClass=web }} Text was copied from this source which is copyrighted by the European Medicines Agency. Reproduction is authorized provided the source is acknowledged.</ref> In 2020, the label for Epidiolex in the US was expanded to include seizures associated with tuberous sclerosis complex. Epidiolex/Epidyolex is the first prescription formulation of plant-derived cannabidiol approved by regulatory bodies in the US and Europe.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Other uses

Research on other uses for cannabidiol includes several neurological disorders, but the findings have not been confirmed to establish such uses in clinical practice.<ref name="devinsky">Template:Cite journal</ref><ref name=black/><ref name=mayo/><ref name="pmid28232276" /><ref name="prud">Template:Cite journal</ref><ref>Template:Cite journal</ref><ref name="Blessing_2015">Template:Cite journal</ref> In October 2019, the FDA issued an advisory warning that the effects of CBD during pregnancy or breastfeeding are unknown, indicating that the safety, doses, interactions with other drugs or foods, and side effects of CBD are not clinically defined, and may pose a risk to the mother and infant.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Many claims are made for the therapeutic benefit of cannabidiol that are not backed by sound evidence. Some claims, such as treatment of cancer, are pseudoscience.<ref name=sbm>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In 2020, the label for Epidiolex in the US was expanded to include treatment of seizures associated with tuberous sclerosis.<ref name="Office of the Commissioner_2020">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Acclaimed for relieving chronic pain, some researchers conclude that the evidence is insufficient to determine the effectiveness of CBD in pain relief, primarily due to the challenging access to pure CBD.<ref>Template:Cite journal</ref>

Non-intoxicating effects

Cannabidiol does not appear to have any intoxicating effects<ref>Template:Cite journal</ref> such as those caused by ∆⁹-THC in cannabis, but it is under preliminary research for its possible anxiolytic and antipsychotic effects.<ref name=black/><ref name=mayo/><ref name=Iseger2015/> As the legal landscape and understanding about the differences in medical cannabinoids unfolds, experts are working to distinguish "medical cannabis" (with varying degrees of psychotropic effects and deficits in executive function) from "medical CBD therapies", which would commonly present as having a reduced or non-psychoactive side-effect profile.<ref name=mayo/><ref name="Iseger2015" /><ref>Template:Cite journal</ref>

Various strains of "medical cannabis" are found to have a significant variation in the ratios of CBD-to-THC and are known to contain other non-psychotropic cannabinoids.<ref name="pmid19729208">Template:Cite journal</ref> Any psychoactive cannabis, regardless of its CBD content, is derived from the flower (or bud) of the genus Cannabis. As defined by US federal law, non-psychoactive hemp (also commonly termed "industrial hemp"), regardless of its CBD content, is any part of the cannabis plant, whether growing or not, containing a ∆⁹-tetrahydrocannabinol concentration of no more than 0.3% on a dry-weight basis.<ref name="col">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> In the United States, certain standards are required for legal growing, cultivating, and producing the hemp plant, but there are no federal standards for quality being enforced in the hemp industry. Certain state regulations are in place, but vary state to state.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> For instance, the Colorado Industrial Hemp Program registers growers of industrial hemp and samples crops to verify that the dry-weight THC concentration does not exceed 0.3%.<ref name=col/>

Available forms

CBD is present as an active constituent of cannabis, which is used both recreationally and medically.

Nabiximols (brand name Sativex), an oromucosal spray made of a complex botanical mixture containing cannabidiol (CBD), delta-9-tetrahydrocannabinol (THC), and additional cannabinoid and non-cannabinoid constituents from cannabis sativa plants, was approved by Health Canada in 2005, to treat central neuropathic pain in multiple sclerosis, and in 2007, for cancer-related pain.<ref name="ReferenceA">Template:Cite journal</ref> In New Zealand, Sativex is "approved for use as an add-on treatment for symptom improvement in people with moderate to severe spasticity due to multiple sclerosis who have not responded adequately to other anti-spasticity medication."<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Epidiolex (Epidyolex in Europe) is an orally administered cannabidiol solution.<ref name="Epidiolex FDA label"/><ref name="Epidyolex EPAR"/> It was approved in 2018 for treatment of two rare forms of childhood epilepsy, Lennox–Gastaut syndrome and Dravet syndrome, and seizures associated with tuberous sclerosis complex.<ref name="Epidiolex FDA label"/><ref name="Epidyolex EPAR"/> In the US, it is approved in these indications for people one year of age and older.<ref name="Epidiolex FDA label"/>

Side effects

Research indicates that cannabidiol may reduce adverse effects of THC, particularly those causing intoxication and sedation, but only at high doses.<ref name="fischer">Template:Cite journal</ref> Safety studies of cannabidiol showed it is well tolerated, but may cause fatigue, somnolence, sedation, diarrhea, or changes in appetite as common adverse effects, with the most common being somnolence and sedation. Side effects of CBD are dose related.<ref name="Huestis Solimini Pichini Pacifici pp. 974–989">Template:Cite journal</ref> Epidiolex documentation lists sleepiness, insomnia and poor quality sleep, decreased appetite, diarrhea, and fatigue.<ref name="Epidiolex FDA label" /><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In November 2019, the FDA issued concerns about the safety of cannabidiol, stating that CBD use has potential to cause hepatotoxicity, interfere with the mechanisms of prescription drugs, produce gastrointestinal disorders, or affect alertness and mood.<ref name="fda11-26-19" /> Over 2020–23, the FDA updated its safety concerns about CBD,<ref name="fdareg">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> acknowledging the unknown effects of protracted use, how it affects the developing brain, fetus, or infants during breastfeeding, whether it interacts with dietary supplements or prescription drugs, whether male fertility is affected, and its possible side effects, such as drowsiness.<ref name="hahn">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Template:As of, 1,085 people contacted US poison control centers about CBD-induced illnesses, doubling the number of cases over the 2018 rate and increasing by 9 times the case numbers of 2017.<ref name="pcc">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Of cases reported in 2019, more than 33% received medical attention and 46 people were admitted to a hospital intensive care unit, possibly due to exposure to other products, or drug interactions with CBD.<ref name="dawn" />

In 2022, the FDA stated that "scientific studies show possible harm to the male reproductive system, including testicular atrophy, harm to the liver, and interactions with certain medications. The FDA has not found adequate information showing how much CBD can be consumed, and for how long, before causing harm. This is particularly true for vulnerable populations like children and those who are pregnant."<ref name=fda11-22/>

Interactions

Laboratory evidence indicated that cannabidiol may reduce THC clearance, increasing plasma concentrations which may raise THC availability to receptors and enhance its effect in a dose-dependent manner.<ref name="pmid7493549">Template:Cite journal</ref><ref name="pmid21667074">Template:Cite journal</ref> In vitro, cannabidiol inhibited the activity of voltage-dependent sodium and potassium channels, which may affect neural activity.<ref name="Ghovanloo_2018">Template:Cite journal</ref> A recent study using X-ray crystallography showed that CBD binds inside the sodium channel pore at a novel site at the interface of the fenestrations and the central hydrophobic cavity of the channel. Binding at this site blocks the transmembrane-spanning sodium ion translocation pathway, providing a molecular mechanism for channel inhibition, which could contribute to a reduced excitability.<ref name="Sait_2020">Template:Cite journal</ref> A small clinical trial reported that CBD partially inhibited the CYP2C-catalyzed hydroxylation of THC to 11-OH-THC.<ref name="Nadulski_2005">Template:Cite journal</ref> Little is known about potential drug interactions, but CBD mediates a decrease in clobazam metabolism.<ref name="Lucas_2018">Template:Cite journal</ref> Work with human liver microsomes shows that cannabidiol inhibits CYP3A5 and CYP3A4 to some degree.<ref>Template:Cite journal</ref>

Pharmacology

Pharmacodynamics

In vitro, cannabidiol has low affinity for, and acts as a negative allosteric modulator of the CB₁ cannabinoid receptor<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

Cannabidiol may be an antagonist of GPR55, a G protein-coupled receptor and putative non-homologous CB₃ cannabinoid receptor shown by in vitro studies to be widely distributed in the brain.<ref name=schouten/><ref name="drugs">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite journal</ref> Cannabidiol may interact with various neurotransmitters, such as serotonin, dopamine, and GABA.<ref name=schouten/><ref name=drugs/><ref name="PMID33384591">Template:Cite journal</ref>

As of 2024, the cellular effects and mechanisms of cannabidiol in vivo are unknown,<ref name="Epidiolex FDA label"/><ref name="Epidyolex EPAR"/> as research to date has been inconclusive and based on laboratory studies.<ref name="schouten">Template:Cite journal</ref> The anticonvulsant effects provided by cannabidiol (Epidiolex) in people with certain forms of epilepsy do not appear to involve cannabinoid receptors.<ref name="Epidiolex FDA label"/> A possible mechanism for the effects of cannabidiol on seizures is by affecting the neuronal movement of calcium in brain structures involved in the excessive electrical activity of seizures.<ref name="Epidyolex EPAR"/>

Pharmacokinetics

The oral bioavailability of cannabidiol is approximately 6% in fasting state and 36.5—57.3% in fed-state<ref name="Kolli_2024" /> in humans, while its bioavailability via inhalation is 11 to 45% (mean 31%).<ref name="Mechoulam2002" /><ref name="Scuderi2009" /><ref name="Kolli_2024">Template:Cite journal</ref><ref name="O'Sullivan_2024">Template:Cite journal</ref> The oral bioavailability of cannabidiol varies based on several factors such as formulation,<ref name="O'Sullivan_2024" /> dose, and food intake.<ref name="Kolli_2024" /> The sublingual bioavailability of cannabidiol is approximately 12 to 35%.<ref name = "Hossain_2023" /> The elimination half-life of cannabidiol in blood is 56 to 61 hours after oral doses twice per day over 7 days.<ref name="Epidiolex FDA label"/> Based on the pharmacokinetic analysis of long-term dosing of cannabidiol in humans, the terminal elimination half-life is estimated to be >134 h.<ref name="Kolli_2024" /> Cannabidiol is metabolized in the liver as well as in the intestines by cytochrome P450 enzymes.<ref name="Epidiolex FDA label"/><ref name=drugs/>

Chemistry

At room temperature, cannabidiol is a colorless crystalline solid.<ref>Template:Cite journal</ref> In strongly basic media and the presence of air, it is oxidized to cannabinodiol (CBND) and a quinone called HU-331.<ref>Template:Cite journal</ref> Under acidic conditions it cyclizes to a multitude of products including THC-9 and iso-THC ,<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref> which also occurs during pyrolysis,<ref>Template:Cite journal</ref> and during smoking.<ref name = "Czégény_2021" /><ref>Template:Cite journal</ref> The synthesis of cannabidiol has been accomplished by several research groups.<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite journal</ref>

File:Intramolekulare cyklisierung von CBD zu Δ9-THC.png

Possible mechanism of intramolecular cyclization of CBD to Δ⁹-THC<ref>Template:Cite journal</ref>

Overview

Category	Compound	Description
Analog	4'-Fluorocannabidiol	fluorinated cannabidiol derivative of CBD
Analog	Cannabidibutol (CBDB)	an analogue to tetrahydrocannabutol (THCB)
Analog	Cannabidiol diacetate	a semi-synthetic derivative of CBD
Analog	Cannabidiol dimethyl ether (CBDD)	an analog of CBD
Analog	H4-CBD	a structural analog of CBD
Analog	HU-320	a structural analog of CBD
Analog	KLS-13019	a structural analog of CBD
Homologue	8,9-Dihydrocannabidiol (H2CBD)	synthetic derivative of CBD
Homologue	Cannabidiorcol (CBD-C1)	a homologue of CBD
Homologue	Cannabidiphorol (CBDP)	the heptyl-homologue of CBD
Homologue	Cannabidivarin (CBDV)	a homologue of CBD
Homologue	CBD-DMH	synthetic homologue of CBD
Homologue	Δ-6-Cannabidiol	a positional isomer of CBD
Isomer	Abnormal cannabidiol	a synthetic regioisomer of CBD
Metabolite	7-Hydroxycannabidiol (7-OH-CBD)	an active metabolite of CBD
Precursor	Cannabidiolic acid (CBDA)	precursor to CBD

Biosynthesis

File:Cannabidiol and THC biosynthesis.svg

Cannabidiol and THC biosynthesis<ref>Template:Cite journal</ref>

Cannabis produces CBD through the same metabolic pathway as THC, until the next to last step, where CBDA synthase performs catalysis instead of THCA synthase.<ref>Template:Cite journal</ref>

Isomerism

Cannabidiol numbering

Cannabidiol's 7 double bond isomers and their 30 stereoisomers

Formal numbering			Terpenoid numbering		Number of stereoisomers	Natural occurrence	Convention on Psychotropic Substances Schedule	Structure
Short name	Chiral centers	Full name	Short name	Chiral centers
Δ5-Cannabidiol	1 and 3	2-(6-isopropenyl-3-methyl-5-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol	Δ4-Cannabidiol	1 and 3	4	No	Unscheduled	File:2-(6-Isopropenyl-3-methyl-5-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol.png
Δ4-Cannabidiol	1, 3 and 6	2-(6-isopropenyl-3-methyl-4-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol	Δ5-Cannabidiol	1, 3 and 4	8	No	Unscheduled	File:2-(6-Isopropenyl-3-methyl-4-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol.png
Δ3-Cannabidiol	1 and 6	2-(6-isopropenyl-3-methyl-3-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol	Δ6-Cannabidiol	3 and 4	4	Yes	Unscheduled	File:2-(6-Isopropenyl-3-methyl-3-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol.png
Δ3,7-Cannabidiol	1 and 6	2-(6-isopropenyl-3-methylenecyclohex-1-yl)-5-pentyl-1,3-benzenediol	Δ1,7-Cannabidiol	3 and 4	4	No	Unscheduled	File:2-(6-Isopropenyl-3-methylenecyclohex-1-yl)-5-pentyl-1,3-benzenediol.png
Δ2-Cannabidiol	1 and 6	2-(6-isopropenyl-3-methyl-2-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol	Δ1-Cannabidiol	3 and 4	4	Yes	Unscheduled	File:2-(6-Isopropenyl-3-methyl-2-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol.png
Δ1-Cannabidiol	3 and 6	2-(6-isopropenyl-3-methyl-1-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol	Δ2-Cannabidiol	1 and 4	4	No	Unscheduled	File:2-(6-Isopropenyl-3-methyl-1-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol.png
Δ6-Cannabidiol	3	2-(6-isopropenyl-3-methyl-6-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol	Δ3-Cannabidiol	1	2	No	Unscheduled	File:2-(6-Isopropenyl-3-methyl-6-cyclohexen-1-yl)-5-pentyl-1,3-benzenediol.png

Pyrolysis

In the typical operating temperature range of e-cigarettes (Template:Cvt), 25–52% of CBD is transformed into other chemical substances: Δ9-THC, Δ8-THC, cannabinol and cannabichromene as predominant pyrolysates. From a chemical point of view, CBD in e-cigarettes can be considered a precursor of THC.<ref name = "Czégény_2021" />

Synthetic derivatives

Numerous synthetic derivatives of CBD are known, and have been researched for generally similar applications as CBD itself.<ref name = "Nelson2020">Template:Cite journal</ref>

History

Efforts to isolate the active ingredients in cannabis were made in the 19th century.<ref name="Adams" /> Cannabidiol was studied in 1940 from Minnesota wild hemp<ref name="Adams">Template:Cite journal</ref> and Egyptian Cannabis indica resin.<ref name="Jacob">Template:Cite journal</ref><ref>Template:Cite journal</ref> The chemical formula of CBD was proposed from a method for isolating it from wild hemp.<ref name="Adams" /> Its structure and stereochemistry were determined in 1963.<ref name="Mechoulam">Template:Cite journal</ref>

Plant breeding

Selective breeding of cannabis plants has expanded and diversified as commercial and therapeutic markets develop. Some growers in the US succeeded in lowering the proportion of CBD-to-THC to accommodate customers who preferred varietals that were more mind-altering due to the higher THC and lower CBD content.<ref name="Romney_2012">Template:Cite news</ref> In the US, hemp is classified by the federal government as cannabis containing no more than 0.3% THC by dry weight. This classification was established in the 2018 Farm Bill and was refined to include hemp-sourced extracts, cannabinoids, and derivatives in the definition of hemp.<ref name="cornell">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Society and culture

Names

Cannabidiol is the generic name of the drug and its Template:Abbrlink.<ref>Template:Cite journal</ref>

Foods and beverages

File:CBD-infused cold brew coffee & tea at a grocery store in Los Angeles, California..png

An example of beverages claiming to contain CBD in a Los Angeles grocery

Food and beverage products containing cannabidiol were widely marketed in the United States as early as 2017.<ref>Template:Cite news</ref> Hemp seed ingredients which do not naturally contain THC or CBD (but which may be contaminated with trace amounts on the outside during harvesting) were declared by the US Food and Drug Administration as generally recognized as safe (GRAS) in December 2018. CBD itself has not been declared GRAS, and under US federal law is illegal to sell as a food, dietary supplement, or animal feed.<ref name="fdareg" /> State laws vary considerably as non-medical cannabis and derived products have been legalized in various jurisdictions.<ref name=creswell/> Despite once having a promising market, the industry for CBD stalled out during the COVID-19 pandemic beginning in 2020, and, by 2024, it collapsed due to withdrawal of investors, the absence of a FDA ruling on efficacy and safety, inconsistent state-by-state legislation, and consumer ambivalence.<ref name="creswell">Template:Cite news</ref>

Similar to energy drinks and protein bars which may contain vitamin or herbal additives, food and beverage items can be infused with CBD as an alternative means of ingesting the substance.<ref name=creswell/> In the United States, numerous products are marketed as containing CBD, but in reality contain little or none.<ref name="fdareg" /><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Some companies marketing CBD-infused food products with claims that are similar to the effects of prescription drugs have received warning letters from the FDA for making unsubstantiated health claims.<ref name="fdareg" /><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> In February 2019, the New York City Department of Health announced plans to fine restaurants that sell food or drinks containing CBD, beginning in October 2019.<ref>Template:Cite news</ref>

Labeling and advertising

Studies conducted by the FDA from 2014 through 2019 have determined that a majority of CBD products are not accurately labeled with the amount of CBD they contain.<ref name=FDAReport>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> For example, a 2017 analysis of cannabidiol content in oil, tincture, or liquid vape products purchased online in the United States showed that 69% were mislabeled, with 43% having higher and 26% having lower content than stated on product labels.<ref name="Bonn">Template:Cite journal</ref><ref name="dawn">Template:Cite news</ref> In 2020, the FDA conducted a study of 147 CBD products and found that half contained THC.<ref name=FDAReport/><ref>Template:Cite journal</ref>

From 2015 to November 2022, the FDA issued dozens of warning letters to American manufacturers of CBD products for false advertising and illegal interstate marketing of CBD as an unapproved drug to treat diseases, such as cancer, osteoarthritis, symptoms of opioid withdrawal, Alzheimer's disease, and pet disorders.<ref name="fda11-22">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Chemical analysis of CBD products found that many did not contain the levels of CBD claimed in advertising.<ref name=fda11-22/>

In December 2020, the Federal Trade Commission initiated a law enforcement crackdown on American companies marketing CBD products as unapproved drugs.<ref name="ftc">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="rooted">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The warning also applied to hemp CBD capsules and oil that were being marketed illegally while not adhering to the federal definition of a dietary supplement.<ref name="rooted" />

Sports

Cannabidiol has been used by professional and amateur athletes across disciplines and countries, with the World Anti-Doping Agency removing CBD from its banned substances list. The United States Anti-Doping Agency and United Kingdom-Anti-Doping Agency do not have anti-CBD policies, with the latter stating that, "CBD is not currently listed on the World Anti-Doping Agency Prohibited List. As a result, it is permitted to use in sport, though the intended benefits are unclear and not backed by clinical evidence. All other cannabinoids (including but not limited to cannabis, hashish, marijuana, and THC) are prohibited in-competition. The intention of the regulations is to prohibit cannabinoids that activate the same receptors in the brain as activated by THC."<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="usada">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In 2019, the cannabis manufacturer Canopy Growth acquired majority ownership of BioSteel Sports Nutrition, which is developing CBD products under endorsement by numerous professional athletes.<ref name="spencer">Template:Cite news</ref> The National Hockey League Alumni Association began a project with Canopy Growth to determine if CBD or other cannabis products might improve neurological symptoms and quality of life in head-injured players.<ref name=spencer/> Some sports leagues have announced sponsorships with CBD companies, such as Major League Baseball (Charlotte's Web) and Ultimate Fighting Championship (Love Hemp).<ref>Template:Cite press release</ref><ref>Template:Cite press release</ref> Numerous professional athletes use CBD, primarily for treating pain.<ref name=spencer/><ref name="loudin">Template:Cite news</ref><ref name="harrison">Template:Cite magazine</ref>

Legal status

Australia

Prescription medicine (Schedule 4) for therapeutic use containing two percent (2.0%) or less of other cannabinoids commonly found in cannabis (such as ∆⁹-THC). A Schedule 4 drug under the SUSMP is a Prescription Only Medicine, or Prescription Animal Remedy – Substances, the use or supply of which should be by or on the order of persons permitted by state or territory legislation to prescribe and should be available from a pharmacist on prescription.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In June 2020, the Australian Therapeutic Goods Administration (TGA) published a consultation on a proposal to pave the way to make "low dose" CBD available to consumer/patients via pharmacists only through moving products from Schedule 4 to 3.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Any products sold would need to have their safety, quality and efficacy pre-assessed by the TGA and be formally approved for sale (details to be outlined by TGA). They would be made available to over 18s only, with the maximum daily dose of 60Template:Nbspmg/day, up to 2% THC finished product allowed, 30-day maximum supply, plant-derived or synthetic. This proposal is based on an initial literature review on the safety of low dose CBD published by the TGA in April 2020.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Epidyolex was approved for the adjunctive therapy of seizures associated with Lennox–Gastaut syndrome or with Dravet syndrome in September 2020.<ref name="Epidyolex TGA" />

Bulgaria

In 2020, Bulgaria became the first country in the European Union to allow retail sales of food products and supplements containing CBD, despite the ongoing discussion within the EU about the classification of CBD as a novel food.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> However, there exists a legal gap because of the lack of a legally-permissible minimum amount of THC in the products containing cannabinoids.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Canada

In October 2018, cannabidiol became legal for recreational and medical use by the federal Cannabis Act.<ref name="cbdact">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Template:As of, CBD products in Canada could only be sold by authorized retailers or federally licensed medical companies, limiting their access to the general public.<ref name="cbc19">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Nonetheless, with online delivery services and over 2,600 authorized cannabis retail stores Template:As of, accessibility has steadily increased over time.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>Template:Cite news</ref> The Canadian government states that CBD products "are subject to all of the rules and requirements that apply to cannabis under the Cannabis Act and its regulations."<ref name=cbdact/> It requires "a processing licence to manufacture products containing CBD for sale, no matter what the source of the CBD is, and that CBD and products containing CBD, such as cannabis oil, may only be sold by an authorized retailer or licensed seller of medical CBD."<ref name=cbdact/> Edible CBD products were scheduled to be permitted for sale in Canada on October 17, 2019, for human consumption.<ref name=cbdact/>

Template:As of, it was still illegal to carry cannabis and cannabis-derived products (including products containing CBD) across the Canadian border. If one carries any amount of cannabis for any purpose (including medical), it needs to be declared to the Canada Border Services Agency. Not declaring it is a serious criminal offence.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Czech Republic

As of May 2023, the State Agricultural and Food Inspection of the Czech Republic is putting together broad regulations regarding a ban on CBD products.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> They will make it illegal to sell products containing cannabidiol and other cannabinoids derived from hemp, as a result of EU Novel Food Regulation. In case of Czech Republic, European Industrial Hemp Association has submitted an official request to the Czech Republic to recognize natural hemp extracts with cannabinoids as traditional food.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

European Union

File:CBD-Vending-Machine.jpg

A CBD product vending machine in Italy.

In 2019, the European Commission announced that CBD and other cannabinoids would be classified as "novel foods",<ref name="chu">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> meaning that CBD products would require authorization under the EU Novel Food Regulation stating that because "this product was not used as a food or food ingredient before May 15, 1997, before it may be placed on the market in the EU as a food or food ingredient, a safety assessment under the Novel Food Regulation is required."<ref name="ec2019">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The recommendation – applying to CBD extracts, synthesized CBD, and all CBD products, including CBD oil – was scheduled for a final ruling by the European Commission in March 2019.<ref name=chu/> If approved, manufacturers of CBD products would be required to conduct safety tests and prove safe consumption, indicating that CBD products would not be eligible for legal commerce until at least 2021.<ref name=chu/> In December 2020, the European Commission concluded that CBD should not be considered as drug and can be qualified as food.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Cannabidiol is listed in the EU Cosmetics Ingredient Database (CosIng).<ref name="cos">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> However, the listing of an ingredient, assigned with an INCI name, in CosIng does not mean it is to be used in cosmetic products or is approved for such use.<ref name=cos/>

Several industrial hemp varieties can be legally cultivated in Western Europe. A variety such as "Fedora 17" has a cannabinoid profile consistently around 1%, with THC less than 0.3%.<ref>Template:Cite journal</ref>

Hong Kong

In 2022, the HKSAR Government proposed a ban on any use of cannabidiol (including for academic research and by medical professionals) within the Hong Kong territory, making Hong Kong the first jurisdiction in the world to have complete prohibition of cannabidiol, starting from February 1, 2023,<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> in part due to the possible presence of THC which is illegal in Hong Kong, according to a research subsidized by the Hong Kong SAR Government.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

New Zealand

In 2017, the New Zealand government made changes to the regulations so that restrictions would be removed, which meant a doctor was able to prescribe cannabidiol to patients.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

The passing of the Misuse of Drugs (Medicinal Cannabis) Amendment Act in December 2018 means cannabidiol is no longer a controlled drug in New Zealand, but is a prescription medicine under the Medicines Act, with the restriction that "the tetrahydrocannabinols (THCs) and specified substances within the product must not exceed 2 percent of the total CBD, tetrahydrocannabinol (THC) and other specified substances."<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Russian Federation

According to a document received in response to an appeal to the Ministry of Internal Affairs of the Russian Federation, measures of state control in the Russian Federation regarding CBD have not been established. However, there is also a response from the Ministry of Health of the Russian Federation indicating that CBD can be considered as an isomer of restricted THC. The "isomer" argument is nonetheless vague, as progesterone, which is freely sold in pharmacies, is also an isomer of THC, all three being Template:Chem.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> On February 17, 2020, the deputy of the Moscow City Duma Darya Besedina sent an official request to the Prime Minister of the Russian Federation Mikhail Mishustin with a request to eliminate that legal ambiguity by publishing official explanations and, if necessary, making required changes in the corresponding government decree.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Singapore

Singapore allows medical cannabis on a case-by-case basis, usually as a last resort drug. Each case is evaluated by the government, and largely comes in the form of Cannabidiol. However, the country is flexible to what is required for patient treatment, despite having some of the strictest drug laws in the world.

Sweden

Cannabidiol is classified as a medical product in Sweden.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> However, in July 2019, Supreme Court of Sweden ruled that CBD oil with any concentration of THC falls under the narcotic control laws.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Switzerland

While THC remains illegal, cannabidiol is not subject to the Swiss Narcotic Acts because it does not produce a comparable psychoactive effect.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Cannabis products containing less than 1% THC can be sold and purchased legally.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Ukraine

On April 7, 2021, the Ukrainian government legalised use of isolated cannabidiol. Additionally, it approved Nabiximols, a cannabidiol-containing drug, for medical use.<ref>Template:Cite news</ref>

United Kingdom

Cannabidiol, in an oral-mucosal spray formulation combined with delta-9-tetrahydrocannabinol, is a product available by prescription for the relief of severe spasticity due to multiple sclerosis (where other anti-spasmodics have not been effective) in the United Kingdom.<ref name="Sativex SmPC">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Until 2017, products containing cannabidiol marketed for medical purposes were classed as medicines by the UK regulatory body, the Medicines and Healthcare products Regulatory Agency (MHRA), and could not be marketed without regulatory approval for the medical claims.<ref>Template:Cite news</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Template:As of, cannabis oil is legal to possess, buy, and sell in the UK, providing the product does not contain more than 1 milligram of THC and is not advertised as providing a medicinal benefit.<ref name="Home Office">Template:Cite news</ref> Individual police officers and others who are ill-informed of the exact legislature pertaining to cannabidiol, however, may erroneously consider it of dubious legality, reflecting lack of awareness.<ref>Ukaegbu O, Smith J, Hall D, Frain T, Abbasian C. Staff awareness of the use of cannabidiol (CBD): a trust-wide survey study in the UK. Journal of Cannabis Research. 2021 Dec;3(1):1-0.</ref>

In January 2019, the UK Food Standards Agency indicated it would regard CBD products, including CBD oil, as a novel food having no history of use before May 1997, and stated that such products must have authorisation and proven safety before being marketed.<ref name="chu" /><ref name="gunn">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The deadline for companies with existing products to submit a full and validated novel foods application with the FSA was March 31, 2021; failure to do so before this date would exclude those companies from selling CBD.<ref name="fsa">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> New products containing CBD after this deadline would require a fully approved application.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In February 2020, the UK FSA advised vulnerable people, such as pregnant women, breastfeeding mothers, and those already taking medication for other medical concerns not to take CBD. The FSA further recommended that healthy adults should not consume more than 70Template:Nbspmg CBD per day.<ref name="fsa" />

United Nations

Cannabidiol is scheduled under the Single Convention on Narcotic Drugs as cannabis. International Narcotics Control Board reminds Member States that, at the reconvened sixty-third session of the Commission on Narcotic Drugs, in December 2020, the States members of the Commission rejected the recommendation of WHO that a footnote be added to the entry for cannabis and cannabis resin in Schedule I of the 1961 Convention as amended to exempt from international control preparations containing predominantly CBD and not more than 0.2 per cent of delta-9-THC.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

United States

Template:As of, cannabidiol extracted from marijuana remains a Schedule I Controlled Substance,<ref name="fdareg" /><ref name="Mead">Template:Cite journal</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> and is not approved as a prescription drug or dietary supplement or allowed for interstate commerce in the United States.<ref name="fda11-26-19">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> CBD derived from hemp (with 0.3% THC or lower) is legal to sell as a cosmetics ingredient or for other purposes not regulated by the FDA, but cannot be sold under federal law as an ingredient in food, dietary supplement, or animal feed.<ref name="fdareg" /><ref name="bell">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> It is a common misconception that the legal ability to sell hemp (which may contain CBD), and hemp extracts and derivatives (including CBD), makes CBD legal for sale as a supplement or medicine.<ref name="bell" /><ref name="fda-hemp">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

In September 2018, the GW Pharmaceuticals drug Epidiolex was placed in Schedule V of the Controlled Substances Act by the Drug Enforcement Administration (DEA),<ref name="CNBC">Template:Cite news</ref> following its approval by the FDA for rare types of childhood epilepsy.<ref name="Epidiolex FDA label"/> It was then removed from the Controlled Substances Act by the DEA in April 2020.<ref>Template:Cite news</ref> Epidiolex is available for prescription use in all 50 states.<ref>Template:Cite news</ref>

In 2013, a CNN program that featured Charlotte's Web cannabis brought increased attention to the use of CBD for the treatment of seizure disorders in children.<ref name="MaaFigi2014">Template:Cite journal</ref><ref name="CNN charlotte">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> A number of states passed laws over the next few years to allow the use of low-THC, high-CBD cannabis oil in such situations.<ref name="ncsl states">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> These states were in addition to the states that had already legalized cannabis for medical or recreational use.<ref name="ncsl states" /> Many states further relaxed their laws regarding CBD following the passage of the 2018 Farm Bill.<ref>Template:Cite news</ref><ref>Template:Cite news</ref>

The 2014 Farm Bill<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> legalized the sale of "non-viable hemp material" grown within states participating in the Hemp Pilot Program which defined hemp as cannabis containing less than 0.3% of THC.<ref>Template:Cite news</ref> The 2018 Farm Bill removed the hemp plant and all "derivatives, extracts, cannabinoids, isomers, acids, salts, and salts of isomers, whether growing or not, with a delta-9 tetrahydrocannabinol concentration of not more than 0.3 percent on a dry weight basis," including CBD, from the Controlled Substances Act, making them legal to manufacture in the United States.<ref name="Mead 2019"/><ref>Section 297A of the Agricultural Marketing Act of 1946 (Template:USC)</ref><ref>Section 201 of the Controlled Substances Act of 1970 (Template:USC)</ref> The FDA retains regulatory authority over hemp-derived CBD,<ref name="fda-hemp" /> while the DEA is not involved in the regulation of legally-compliant hemp and hemp products.<ref name="dea">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The 2018 Farm Bill requires that research and development of CBD for a therapeutic purpose would have to be conducted under notification and reporting to the FDA.<ref name="fda-hemp" /><ref name="hahn" />

Veterinary use

Research

The number of research projects and scientific publications on cannabidiol and other cannabinoids in pets surged in the late 2010s; nonetheless, Template:As of, there were no hemp-derived, cannabinoid-rich registered veterinary medicinal products in any of the major regions (see #Legal status).

In the US and other territories there are, however, numerous veterinary nutraceutical products available over the counter (OTC). The lack of clarity in the regulations governing veterinary hemp food supplements allows for products of questionable quality to flood the market,<ref name="fda7-19">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref><ref name="Wakshlag_2020a">Template:Cite journal</ref> which may pose a risk to the wellbeing of pets and owners.

To understand better the benefits of CBD and associated compounds for the quality of life of animals, companies specialized in CBD products for animals have been funding research projects.<ref name="McGrath_2019">Template:Cite journal</ref><ref name="Verrico_2020">Template:Cite journal</ref><ref name="Mogi_2019">Template:Cite journal</ref><ref name="Wakshlag_2020">Template:Cite journal</ref>

Canine osteoarthritis

CBD's ability to help regulate the endocannabinoid system<ref>Template:Cite journal</ref><ref>Template:Cite journal</ref><ref>Template:Cite book</ref> and reduce the release of excitatory neurotransmitters could result in a retrograde inhibitory signal that lessens chronic pain responses. Studies in dogs with chronic pain associated with osteoarthritis showed an increase in level of activity in animals receiving CBD-rich food supplements.<ref name="Gamble_2018">Template:Cite journal</ref><ref name="Brioschi_2020">Template:Cite journal</ref><ref name="Kogan_2020">Template:Cite journal</ref><ref name="Verrico_2020" />

Epilepsy

From the results seen in humans with drugs such as Epidiolex and Sativex in scientific studies and reviews,<ref>Template:Cite book</ref> it could be expected that CBD-based products would be helpful to manage seizures in dogs. However, despite the numerous case reports presented by veterinary neurologists supporting the benefits of CBD as adjunctive therapy, Template:As of, published controlled studies have not shown a statistically significant decrease in the number of seizures across the groups receiving CBD.<ref name="McGrath_2019" /><ref name="Mogi_2019" />

Pharmacokinetics

The oral bioavailability of CBD varies greatly across species and it is linked to the presentation and the time of administration.<ref name="Deabold_2019">Template:Cite journal</ref><ref name="Wakshlag_2020" /><ref name="Vaughn_2020">Template:Cite journal</ref> A 24-hour kinetic examination in dogs showed that the absorption of the cannabidiolic acid (CBDA) does occur, and that this molecule is absorbed least twice as well as CBD post oral ingestion.<ref name="Deabold_2019" /><ref name="Wakshlag_2020" /><ref>Template:Cite journal</ref>

It was found that the major metabolites of CBD in humans (7-OH-CBD and 7-COOH-CBD) are not prevalent in dogs, while 6-OH-CBD was found to be the primary metabolite in dogs receiving a CBD-enriched cannabis-derived herbal extract,<ref>Template:Cite journal</ref> suggesting that canine and human CBD metabolic route might be somewhat different.<ref name="Vaughn_2020" />

Research

Template:As of, little evidence exists for cannabidiol reducing psychiatric disorders in humans.<ref name=kirkland/><ref name="black" /><ref name="mayo" /><ref name="prud" /><ref name="Hoch">Template:Cite journal</ref>

In the United States, federal illegality complicates conducting historic research on CBD.<ref>Template:Cite news</ref>

Further reading

• CBD: What Does the Science Say?
• Template:Cite news
• Template:Skeptoid