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Martin R Tramèr a Division d'Anesthésiologie, Département
Anesthésiologie, Pharmacologie Clinique et Soins Intensif de
Chirurgie, Hôpitaux Universitaires, CH-1211 Genève 14, Switzerland, b Pain
Research, Nuffield Department of Anaesthetics, Churchill, Oxford
Radcliffe Hospital, Oxford OX3 7LJ, c Pain Management Centre,
Undercroft, South Block, Queen's Medical Centre, Nottingham NG7 2UH, d Department of Clinical
Pharmacology, Radcliffe Infirmary, Oxford OX2 6HE
Correspondence to: M R Tramèr, martin.tramer{at}hcuge.ch
Objective:
To quantify the antiemetic efficacy and
adverse effects of cannabis used for sickness induced by chemotherapy.
What is already known on this topic
What this study adds
Design:
Systematic review.
Data sources:
Systematic search (Medline, Embase,
Cochrane library, bibliographies), any language, to August 2000.
Studies:
30 randomised comparisons of cannabis with placebo or antiemetics from which dichotomous data on efficacy and harm
were available (1366 patients). Oral nabilone, oral dronabinol (tetrahydrocannabinol), and intramuscular levonantradol were tested. No
cannabis was smoked. Follow up lasted 24 hours.
Results:
Cannabinoids were more effective antiemetics than prochlorperazine, metoclopramide, chlorpromazine,
thiethylperazine, haloperidol, domperidone, or alizapride: relative
risk 1.38 (95% confidence interval 1.18 to 1.62), number needed to
treat 6 for complete control of nausea; 1.28 (1.08 to 1.51), NNT 8 for
complete control of vomiting. Cannabinoids were not more effective in
patients receiving very low or very high emetogenic chemotherapy. In
crossover trials, patients preferred cannabinoids for future
chemotherapy cycles: 2.39 (2.05 to 2.78), NNT 3. Some potentially
beneficial side effects occurred more often with cannabinoids:
"high" 10.6 (6.86 to 16.5), NNT 3; sedation or drowsiness 1.66 (1.46 to 1.89), NNT 5; euphoria 12.5 (3.00 to 52.1), NNT 7. Harmful
side effects also occurred more often with cannabinoids: dizziness 2.97 (2.31 to 3.83), NNT 3; dysphoria or depression 8.06 (3.38 to 19.2), NNT
8; hallucinations 6.10 (2.41 to 15.4), NNT 17; paranoia 8.58 (6.38 to
11.5), NNT 20; and arterial hypotension 2.23 (1.75 to 2.83), NNT 7. Patients given cannabinoids were more likely to withdraw due to side
effects 4.67 (3.07 to 7.09), NNT 11.
Conclusions:
In selected patients, the cannabinoids
tested in these trials may be useful as mood enhancing adjuvants for controlling chemotherapy related sickness. Potentially serious adverse
effects, even when taken short term orally or intramuscularly, are
likely to limit their widespread use.
Requests have been made for legalisation of cannabis (marijuana) for
medical use
Oral nabilone and dronabinol and intramuscular levonantradol are
superior to conventional antiemetics (such as prochlorperazine or
metoclopramide) in chemotherapy
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