Cbd oil dosage for nausea
Introduction Chemotherapy-induced nausea and vomiting (CINV) remains an important issue for patients receiving chemotherapy despite guideline-consistent antiemetic therapy. Trials using delta-9-tetrahydrocannabinol-rich (THC) products demonstrate limited antiemetic effect, significant adverse events and flawed study design. Trials using cannabidiol-rich (CBD) products demonstrate improved efficacy and psychological adverse event profile. No definitive trials have been conducted to support the use of cannabinoids for this indication, nor has the potential economic impact of incorporating such regimens into the Australian healthcare system been established. CannabisCINV aims to assess the efficacy, safety and cost-effectiveness of adding TN-TC11M, an oral THC/CBD extract to guideline-consistent antiemetics in the secondary prevention of CINV.
Methods and analysis The current multicentre, 1:1 randomised cross-over, placebo-controlled pilot study will recruit 80 adult patients with any malignancy, experiencing CINV during moderate to highly emetogenic chemotherapy despite guideline-consistent antiemetics. Patients receive oral TN-TC11M (THC 2.5mg/CBD 2.5 mg) capsules or placebo capsules three times a day on day −1 to day 5 of cycle A of chemotherapy, followed by the alternative drug regimen during cycle B of chemotherapy and the preferred drug regimen during cycle C. The primary endpoint is the proportion of subjects attaining a complete response to CINV. Secondary and tertiary endpoints include regimen tolerability, impact on quality of life and health system resource use. The primary assessment tool is patient diaries, which are filled from day −1 to day 5. A subsequent randomised placebo-controlled parallel phase III trial will recruit a further 250 patients.
Ethics and dissemination The protocol was approved by ethics review committees for all participating sites. Results will be disseminated in peer-reviewed journals and at scientific conferences.
Drug supply Tilray.
Protocol version 2.0, 9 June 2017.
Trial registration number ANZCTR12616001036404; Pre-results.
- chemotherapy-induced nausea and vomiting
- randomized trial
This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
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Strengths and limitations of this study
Largest and most definitive randomised double-blind placebo-controlled trial of cannabis for secondary prevention of chemotherapy-induced nausea and vomiting (CINV).
First study to assess the impact on heath resource use and cost-effectiveness of cannabis within the Australian health system.
Utility of patient-reported outcomes.
Self-titrating dose of tetrahydrocannabinol/cannabidiol.
Primary outcome measure (complete response) does not include nausea assessment, to ensure comparability with other CINV trials.
Chemotherapy-induced nausea and vomiting (CINV) remains a significant cause of morbidity in oncology patients despite the best current antiemetic prophylaxis.1
The Multinational Association of Supportive Care in Cancer (MASCC) has published guidelines which recommend a standardised regimen of a 5-HT3 receptor antagonist, with dexamethasone, and for most regimens an NK-1 antagonist for optimal antiemetic prophylaxis of moderate or high emetic risk.2 Even among patients receiving guideline-consistent antiemetic prophylaxis, contemporary observational studies of moderate or highly emetogenic chemotherapy found that 46%–57% experienced significant nausea and 9%–37% experienced vomiting.3–6
Cannabinoids for CINV
The mechanism of delayed nausea and vomiting is incompletely understood, but may involve non-serotonergic receptors including the cannabinoid CB1 receptor, with a potential role for cannabis products in its amelioration.7 There is limited evidence of the efficacy of cannabis products for the prevention and treatment of CINV.8 While several studies have been carried out using smoked marijuana or synthetic oral tetrahydrocannabinol medicines (THC: dronabinol, nabilone) for treating CINV, most showed limited efficacy, were inadequately powered and used outdated control antiemetic arms.9
The major limitations of current oral THC-rich cannabinoids for this indication are unpredictable gastrointestinal absorption, poor bioavailability, delayed onset of action and inability to rapidly self-titrate the dose for nausea control depending on tolerance.9 Furthermore, THC-only medications can be limited in their therapeutic potential by their intoxicating and disorientating central nervous system effects at the higher doses often needed to control nausea and vomiting.9 Cannabidiol (CBD) is known to counteract the psychiatric adverse effects of THC, and has inherent anxiolytic properties.10 The addition of CBD to THC should ameliorate the intoxicating effects of THC, and allow delivery of higher therapeutic doses, without increasing the overall intoxication, paranoia and euphoria associated with THC, with diminished potential for abuse.11
Nabiximols (Sativex; GW Pharmaceuticals, UK) is a THC/CBD cannabis extract derived from the Cannabis sativa plant containing THC and CBD in defined and near-equal amounts, and presented as a buccal spray.11 A published small pilot double-blind randomised trial of nabiximols for secondary prevention of CINV found substantial efficacy, high patient acceptability and manageable side effects.12 In this study, 16 patients who experienced CINV after moderately emetogenic chemotherapy, despite prophylaxis with a guideline-consistent antiemetic regimen,12 were randomised to nabiximols or placebo. Participants received up to 8.1 mg THC/7.5 mg CBD over 2 hours, then up to 21.6 mg THC/20 mg CBD every 24 hours for 5×24-hour periods. In the nabiximols group, the mean dose per 24 hours was 13 mg THC (range 5.4–13.5)/12 mg CBD (range 5–12.5) and the median duration was 3 days (range 1–5). The short dose titration was tolerated in 86% receiving nabiximols, with one patient discontinuing because of transient psychiatric effects. Adverse effects were experienced in 86% receiving nabiximols and 67% receiving placebo. Substantial efficacy was observed, with complete response in 71% vs 22%, (difference 49%, 95% CI 1% to 75%), absence of delayed emesis in 71% vs 22% and nausea in 57% vs 22%, however no difference in acute nausea nor vomiting.12 Nabiximols is licensed for the indication of neurospasticity in multiple sclerosis, but is not commercially available in Australia, and is not available for use in our proposed trial. There is a paucity of data on the cost-effectiveness of nabiximols outside of multiple sclerosis.13
This study will use a novel oral THC/CBD capsule formulation (‘TN-TC11M’, Tilray). The product is intended to provide equivalent systemic exposures to THC and CBD as nabiximols and was formulated for a consistent and reproducible pharmacokinetic profile, allowing patients to self-titrate as needed without a concern for a delayed onset. The product will be dosed similarly to the Duran study, commencing 24 hours prior to chemotherapy to confirm tolerability.
We hypothesise that the addition of TN-TC11M to standard guideline-based antiemetics will improve the control of CINV, leading to improved quality of life. The potential resource implications are of higher CINV regimen drug costs, but reduced costs of the management of refractory CINV through the reduced need for rescue medications and reduced hospitalisation.
Methods and analysis
The cannabis for CINV trial is an Australian-based, double-blind, placebo-controlled, two-stage randomised controlled trial. The primary aim is to determine the efficacy of adding an oral CBD-rich THC extract (TN-TC11M) for secondary prevention of CINV after failure of a guideline-consistent prophylactic antiemetic regimen.
The primary objective of this study is to compare, among patients randomised to TN-TC11M or placebo, the ability to control emesis and nausea, as determined by:
The proportion of patients achieving a ‘complete response’ during the overall phase of treatment (0–120 hours), defined as no emesis and no use of rescue medications.
The pilot study (crossover) and definitive trial (parallel) will use different methods of analysis as outlined in the statistical analysis section.
The secondary objectives are to compare, among patients randomised to TN-TC11M or placebo:
Proportions of patients during acute (0–24 hours), delayed (24–120 hours) and overall (0–120 hours) phases of cycles A, B and C with (1) complete response, (2) no emesis (vomiting or dry retching), (3) no significant nausea, defined as degree of nausea <2 out of 10 using an 11-point rating scale and (4) no use of rescue medications.
Number of emetic episodes during 0–120 hours of cycles A, B and C.
Cannabinoid-related and other adverse events
Endpoint: Proportions with specified cannabinoid-related and other adverse events (structured checklist, Common Terminology Criteria for Adverse Events (CTCAE).
Health-related quality of life
Endpoint: Summary scales (nausea, vomiting) of Functional Living Index-Emesis (FLIE) and all items of Assessment of Quality of Life (AQOL-8D).
Endpoint: Adherence (patient diaries, pill counts), preference.
The tertiary and correlative objectives are:
To compare health system resource use and costs between randomised groups
Endpoint: Health system resource use and costs.
To model the cost-effectiveness of cannabinoid therapy compared with placebo or other antiemesis alternatives, for prevention of CINV, from the perspective of the healthcare system
Endpoint: Health outcomes relative to costs.
Trial oversight and monitoring
The CannabisCINV trial is a collaboration between the Chris O’Brien Lifehouse; the National Health and Medical Research Council (NHMRC) Clinical Trials Centre, University of Sydney; and the Lambert Initiative for Cannabinoid Therapeutics, University of Sydney.
The University of Sydney is the study sponsor. The NHMRC Clinical Trials Centre will be responsible for trial coordination, monitoring, site audits, management, data acquisition and statistical analysis.
Safety and feasibility endpoints will be reviewed at 3 monthly intervals by the independent data and safety monitoring committee (IDSMC) during both the pilot and phase III trial. The IDSMC will assess the rate of serious adverse events (SAEs) (graded ≥3 by CTCAE criteria) and accrual, with no pause in recruitment planned. Consideration will be given to altering aspects of the study if:
The accrual rate is insufficient to complete the study in a reasonable time frame.
The rate of SAEs in the oral TN-TC11M arm is unacceptably high compared with the placebo arm.
Medical or ethical reasons emerge affecting continued performance of the study.
Protocol amendments can only be made by the trial management committee and must be approved by the institutional Human Research Ethics Committee (HREC) prior to implementation.
Patient and public involvement
Consumer representatives were involved in the development of this trial. The primary and secondary outcomes of this study, including adverse events, are patient-reported outcomes, emphasising the focus of this study on patient priorities, experience and preferences. Results of this study will be disseminated to study participants through peer-reviewed journals and at scientific conferences.
The protocol consists of a pilot phase II, double-blinded, randomised, placebo-controlled cross-over study followed by a planned definitive phase III, blinded, randomised, parallel, placebo-controlled trial (see figure 1). The pilot trial will be conducted at 10 sites across the state of New South Wales (NSW), Australia, in both tertiary referral centres and regional centres in outpatient comprehensive cancer care units. A list of the study sites can be accessed from the Australian New Zealand Clinical Trials Registry.
Study schema for pilot phase II, double-blinded, randomised, placebo-controlled cross-over study and planned definitive phase III, blinded, randomised, parallel, placebo-controlled trial. CBD, cannabidiol; THC, tetrahydrocannabinol.
Patients who fulfil all of the following characteristics will be considered eligible for enrolment:
Adult patients with any malignancy.
Receiving moderate to highly emetogenic intravenous chemotherapy (day 1) in a 14-day or 21-day cycle.
Experienced significant CINV, defined as requiring ≥1 dose of rescue medication for vomiting or distress by nausea, and/or ≥ moderate nausea on a five-point rating scale (0 = nil, 1 = minimal, 2 = moderate, 3 = severe, 4 = very severe), at any time during the current chemotherapy regimen despite guideline-consistent antiemetics.
Planned for at least two further cycles of the same chemotherapy regimen.
Eastern Cooperative Oncology Group (ECOG) performance status of 2 or less.
Patients with the following characteristics will be excluded from study enrolment:
Symptomatic central nervous system/leptomeningeal disease, gastrointestinal tract obstruction or disease-related nausea or vomiting requiring daily antiemetic therapy.
Oral chemotherapy during study treatment (eg, oral capecitabine).
Radiotherapy to the brain, abdomen or pelvis within the week prior to commencing study treatment, or planned during study treatment.
Contraindication to cannabinoid treatment:
Unstable cardiovascular disease (uncontrolled hypertension, unstable ischaemic heart disease, unstable congestive cardiac failure).
History of epilepsy or recurrent seizures.
History of schizophrenia, other psychotic illness, severe personality disorder, suicidal ideation or other significant psychiatric disorder, other than depression associated with the underlying condition.
Substance use disorder (International Classification of Diseases (ICD-10) criteria of abuse or dependence) to alcohol, opioids, benzodiazepines, cannabis or illicit stimulants.
Unwilling/unable to avoid driving or operating heavy machinery during and for up to 72 hours after taking study medication.
Concerns regarding safe storage of medication.
Cannabis or cannabinoid-based medications within 30 days of study or unwilling to abstain for the duration of the study.
Prior hypersensitivity or intolerable adverse reaction to cannabis or cannabinoid-based medications, 5HT3 antagonist, dexamethasone or NK1 antagonist.
Pregnancy, lactation or inadequate contraception. Women must be postmenopausal, infertile or use a reliable means of contraception. Women of childbearing potential must have a negative pregnancy test done within 7 days prior to registration. Men must have been surgically sterilised or use a (double if required) barrier method of contraception.
Investigational medical product
This study will use a novel oral THC/CBD capsule formulation (‘TN-TC11M’, Tilray) derived from Cannabis sativa L. extract. It contains delta-9-THC and CBD in a 1:1 ratio, with each oral capsule containing 2.5 mg THC and 2.5 mg CBD. This is intended to provide equivalent systemic exposures to THC and CBD as those obtained from nabiximols (a single dose of nabiximols which comprises 2.7 mg THC and 2.5 mg CBD). In contrast to nabiximols, TN-CT11M was formulated for a consistent and reproducible pharmacokinetic profile, allowing patients to self-titrate as needed without a concern for a delayed onset. Investigational product will be dosed similarly to the Duran study,12 and administration will commence 24 hours prior to chemotherapy to confirm tolerability.
The placebo will be in white capsules, identical in appearance to that of the active treatment.
Randomisation, allocation concealment and double-blind conditions
Randomisation will be performed centrally using minimisation, with stratification by chemotherapy emetogenic risk (moderate vs high by MASCC criteria) and by site.
Pharmaceutical Packaging Professionals will store and distribute the drug on behalf of the study sponsor to all participating sites on receipt of all drug order forms.
All patients will receive antiemetics including 5HT3 antagonist, corticosteroid and (where indicated) NK1 antagonist; according to a prespecified choice of regimen consistent with guidelines from eviQ Cancer Treatments Online14 and/or MASCC guidelines for optimal antiemetic prophylaxis of chemotherapy.2
The following rescue therapies are permitted:
Lorazepam, for example, 1 mg per oral (PO) two times a day when required (prn).
Metoclopramide, for example, 10 mg PO three times a day prn.
Haloperidol, for example, 0.5–1 mg PO three times a day prn.
Prochlorperazine, for example, 5–10 mg PO three times a day prn, 25 mg sup per rectum every 8 hours prn.
Olanzapine, for example, 5 mg PO two times a day or 10 mg PO mane for 3 days.
5HT3 antagonists should only be used when other rescue therapies have failed.
Recruitment and consent
Patient screening and enrolment undertaken at participating sites will be overseen by the site principal investigator and performed by trained study personnel. A screening log will document all eligible patients screened and approached along with reasons for any exclusions. Patients will provide written informed consent prior to study enrolment.
The phase II pilot trial (n=80) will be a multisite, 1:1 randomised, double-blind, placebo-controlled trial (figure 1). The dosing regimen will be similar to that used in the nabiximols study by Duran et al described above, which was shown to be well tolerated and effective, however, patients will also receive study drug for 24 hours prior to chemotherapy to confirm tolerability. It will use a cross-over design and a significance level of 10% to increase efficiency, and allow patients to nominate a preferred drug in the final cycle.
In the pilot study, during chemotherapy cycle A, subjects will be randomised to receive oral TN-TC11M capsules (2.5/2.5 mg) three times a day from day −1 to 5 or identical placebo capsules, in addition to guideline-consistent antiemetics. For cycle B, subjects will crossover to receive the alternative formulation in the same schedule.
On treatment, patients will be able to self-titrate their TN-TC11M/placebo exposure based on tolerance, with a maximum does of 30 mg/30 mg per day (12 tablets) (table 1). Following cycle B, subjects are asked to nominate their preferred regimen after cycle B, and where relevant will receive that agent with cycle C.
On treatment schedule with dose modifications
The definitive randomised phase III study (n=250) will assess the efficacy of the addition of TN-TC11M to guideline consistent antiemetics as secondary prevention of CINV. It will have a parallel group design, to reduce bias given the possibility of carry-over effect from cross-over in subsequent cycles, and to investigate longer-term efficacy over multiple chemotherapy cycles.
In the definitive study, during cycle A, subjects will receive oral TN-TC11M capsules (2.5/2.5 mg) three times a day from day −1 to 5 or identical placebo capsules, in the same treatment schedule (see table 1). For cycle B (and C if relevant), subjects will recommence treatment with the investigational product on their maximum tolerated dose from the previous cycle, with further scope to self-titrate according to symptoms.
The participant will be instructed on the use of the patient diary, which has been designed for this study, to record:
Nausea (past 24-hour period), recorded using an 11-point rating scale.
Date, time and type of rescue medication used.
Vomiting and dry retching episodes.
The patient diary will be completed by the patient. There will be daily assessment of patients on days 1–6 of each cycle to ensure:
Study treatments are taken appropriately.
Accurate records in the patient diary.
Completion of structured checklist of cannabinoid-specific adverse events.
Advice is provided regarding management of any adverse events.
Trial data will be recorded on the electronic Case Report Forms (eCRFs) provided and will monitored by clinical trials staff from the NHMRC Clinical Trials Centre.
Unblinding and poststudy care
Following completion of trial treatment, patients who have experienced benefit and require ongoing treatment with the same chemotherapy regimen may be eligible for ongoing access to TN-TC11M, free of charge, contingent on unblinding performed by an unblinded statistician.
Sample size estimation
The estimated sample size for the pilot trial is 80 patients (40 per arm), using a primary endpoint of complete response to the study drug and placebo during cycle A and B of treatment. Using a cross-over design, randomising patients to either study drug followed by placebo or placebo followed by study drug, will have 80% power at a two-sided significance level of 10% to detect a 20% difference in discordant responses (response on one intervention, but not the other). Accrual is expected to take 12 months. The 20% difference is based on the assumption that 42% of patients on the study drug will respond compared with 22% on placebo, and that the responders in the placebo group will respond/not respond equally on the study drug (11% respond on each).
The estimated sample size for the definitive trial is 250 patients (125 per arm), using a primary endpoint of complete response during cycle A of study treatment. A sample size of 250 patients provides 80% power at two-sided 5% level of significance to detect improvement in complete response from 22% to 42.5%. Accrual is expected to take 2.5 years.
The sample size for each trial will allow for a drop-out/ineligibility rate of 20%.
The current evidence suggests that this level of improvement is both worthwhile and feasible.
Analyses will be conducted using intention-to-treat (ITT) principles. The primary analyses will include all patients who were randomised. Missing values will not be imputed. The results will be examined for differential effect in the two periods and if necessary, the data from cycle A will be analysed separately.
The primary outcome is complete response. The primary analysis will be a comparison of the proportion of patients with a complete response between the two treatments over cycle A and cycle B, using McNemar’s test. In the event that there is differential drop-out between period or a period by treatment interaction, the results from the first period will be analysed using a χ 2 test. Analyses to assess period by treatment interaction will use generalised estimating equations (GEEs) to account for the correlation within a patient. Secondary analyses to adjust for any baseline variables will also use GEEs. All tests will use a two-sided significance level of 10%.
The primary analyses will include all randomised patients using ITT principles, and compare the proportion of patients with complete response in the two treatment arms during the overall phase (0–120 hours) of cycle A, using a χ 2 test. Secondary analyses adjusting for baseline variables will use GEEs. Binary secondary outcomes will be analysed as for the primary outcome. Count data will be analysed using a generalised linear model with a Poisson distribution. Cannabinoid-related adverse events and measures of adherence will be analysed with a χ 2 test or two-sample t-test, or just listed depending on numbers. All tests will use a two-sided significance level of 5%.
Health economic analysis
A within-trial and modelled economic evaluation will be undertaken to determine the incremental cost-effectiveness of oral cannabinoid therapy compared with placebo and other antiemetic therapies, from a health system perspective.
For the within-trial analysis, resource use will be identified and measured from trial case report forms (for hospitalisations), and through linkage to Medicare claims data for outpatient visits (Medicare Benefits Schedule) and prescribed medicines (Pharmaceutical Benefits Scheme). Australian unit costs will be applied to the resource usage data (eg, Australian Refined Diagnostic Related Groups and Medicare scheduled fees using the most recent reference year). For the modelled evaluation, resource use will be taken from the trial data for cannabinoid and placebo therapies, and supplemented with published estimates of resource use and costs for alternative ‘usual care’ antiemetic therapies.
The definitive study will employ a health economic analysis which will use the proportion of patients with ‘complete response’ (ie, participants with no emesis and no use of rescue medications, consistent with the primary endpoint); quality of life as measured by the FLIE with 5-day recall and AQOL-8D instruments,15 and quality-adjusted survival. Quality-adjusted survival time will be used to quantify the incremental effectiveness of cannabinoid treatment. Quality-adjusted survival will be calculated by applying utility weights for quality of life derived from the AQOL-8D utility instrument to survival data using established methods. In addition, we will conduct a sensitivity analysis to determine the incremental costs to achieve an outcome of no significant nausea, no emesis and no use of rescue medications.
Two cost-effectiveness outcomes will be reported: (1) the incremental cost per additional complete responder (trial primary endpoint) at 30 days after last dose of study drug and (2) the incremental cost per quality-adjusted life year (QALY) gained at 12 months, using extrapolated data. These will be expressed as incremental cost-effectiveness ratios and plotted on a cost-effectiveness plane. Bootstrapping will be used to estimate a distribution around costs and health outcomes, and to calculate CIs around incremental cost-effectiveness ratios.16 A cost-effectiveness acceptability curve will be plotted, providing information about the probability that the intervention is cost-effective given the Australian government’s willingness to pay for a QALY gained.17 One-way, two-way and probabilistic sensitivity analyses will be undertaken for relevant variables, including cost of the study drug.
Ethics and dissemination
In Australia, the study will be conducted according to the Note for Guidance on Good Clinical Practice (CPMP/ICH/135/95) annotated with Therapeutic Goods Administration Drug Safety and Evaluation Branch comments (July 2000) and in compliance with applicable laws and regulations. The study will be performed in accordance with the NHMRC Statement on Ethical Conduct in Research Involving Humans 2007—updated May 2015, the NHMRC Australian Code for the Responsible Conduct of Research 2007 and the principles laid down by the World Medical Assembly in the Declaration of Helsinki 2008.
To this end, no patient will be recruited to the study until all the necessary approvals have been obtained and the patient has provided written informed consent. Further, the investigator shall comply with the protocol, except when a protocol deviation is required to eliminate immediate hazard to a participant. In this circumstance the NHMRC CTC, principal investigator and HREC must be advised immediately.
Patient enrolment for the pilot study commenced in November 2016 at the Chris O’Brien Lifehouse in NSW, Australia, with the 10th NSW site opened in June 2017. To date, 49 patients have been enrolled, with anticipated pilot study enrolment completion by the third quarter 2018.
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Anesthetic Premedication With a Cannabis Extract (Cannapremed) (Cannapremed)
Clinical evidence about the effects of cannabis in a perioperative setting or for the management of acute pain is rather scarce, mostly consisting of case report-based opinions on adverse events during or after general anesthesia after smoking cannabis, experimental pain trials in healthy volunteers, and a few clinical trials using different drugs, dosages and routes of administration. It is difficult to draw strong conclusions from the available evidence, that may seem sometimes even contradictory, mainly due -the investigators believe- to the many sources of variability in the study designs (e.g.: heterogeneity of the study samples, underpowered, unblinding, lack of randomization, timing of the therapeutic intervention, different experimental pain models, inclusion of different kind of surgical pain, etc.). Nevertheless, expert’s opinion after a critical review of the literature is that cannabis and cannabinoids may have a beneficial role in the management of acute post-operative pain and nausea, at least for a selected group of patients and through an appropriate therapeutic intervention.
Therefore, it seems to us pertinent to carry out an investigation in order to re-evaluate the issue of perioperative cannabis use through a sufficiently powered and controlled clinical trial. Some of cannabis effects such as sedation, bronchodilation, dryness of respiratory secretions, vein dilation, and increase of heart rater without producing hypertension, make of it an attractive option for pre-medication; while its antiemetic properties and its analgesic potential without causing respiratory depression may be profitable for the post-operative period.
Cannabis oil seem to be most suitable to our investigation. The co-administration of tetrahydrocannabinol (THC) with cannabidiol (CBD) may translate into additional therapeutic benefits with an attenuation of adverse effects. The investigators expect to obtain less sedation, milder "high", lower incidence of anxiety, tachycardia, and hyperalgesia, as compared with THC-only acute pain trials.
|Condition or disease||Intervention/treatment||Phase|
|Pain, Postoperative Postoperative Nausea and Vomiting Anxiety||Drug: Tetrahydrocannabinol Drug: Dummy oromucosal||Phase 2 Phase 3|
The selection of patients will be done during the pre-anesthetic assessment the day before surgery. After obtaining informed consent, eligible patients will be randomly allocated to one of the following regimes: Cannabis oil high dose (21.6 mg THC + 20 mg CBD), Cannabis oil low dose (10.8 mg THC + 10 mg CBD), placebo control (no premedication drugs).
Treatments will be administered in a double-dummy manner. Identical bottles of Cannabis oil and placebo should be obtained from the manufacturer (Bazelet group). Identical prefilled vials containing sodium Olive oil should be prepared by the hospital pharmacist. To the best of our knowledge, no clinical studies evaluating the effects of Cannabis oil on acute pain or in a perioperative setting have been done to date. Therefore, the investigators estimate a Cannabis oil dose range that seems reasonable to obtain relevant clinical and a manageable occurrence of adverse events, mainly based on the recommendations from the manufacturer, on the available pharmacological data presented in the previous section and on the results of other clinical trials with a similar design using comparable doses of oral THC. Nevertheless, the first 10 patients will be randomly assigned either to the Cannabis oil low dose group or to the placebo control group only. The investigators will proceed with the full four-group randomization only if no serious adverse events are registered among the 10 first recruited patients.
At the arrival to the operating room, blood samples for baseline levels of cannabinoids will be drawn at the moment of placing the intravenous line, and the first anxiety assessment should be done by the examiner/anesthetist. The study drugs will be administered at the entrance to the O.R. or at the induction room 15 minutes before the induction of anesthesia (i.e.:). Premedication dose should be calculated to be the equivalent of 10 mg and 20 mg oral THC for the low and high dose groups, respectively (4, 8 puffs). At the same time, the prefilled drops containing Olive oil will be administered as intravenous bolus. The patients will be immediately connected to the standard O.R. monitoring.
Induction of general anaesthesia will be done in a standardized fashion with fentanyl 2 µg/Kg, propofol 1-4 mg/Kg (and vecuronium 0.1 mg/Kg if intubation is required). For anaesthetic maintenance, isoflurane 0.7-2% on 1:2 oxygen : nitrous oxide gas mixture, and fentanyl boluses 1 µg/Kg to keep a bispectral index (BIS) between 40 to 60, and a heart rate and mean arterial pressure between 70-130% from pre-induction baselines. Preemptive antiemetics (e.g.: granisetron, ondansetron, metoclopramide, dexamethasone, etc.) should not be given. No additional analgesics should be administered (e.g.: ketorolac or other NSAID’s, dipyrone).
A loading dose of morphine 0.2 mg/Kg will be given before the end of surgery provided that the patient can maintain spontaneous breathing or pressure support ventilation. Intravenous morphine patient-controlled analgesia (PCA) will be initiated on the arrival to the recovery room with boluses of 1 mg and a lockout time of 6 minutes, without background.