• Expert Rev Neurother · Apr 2012

    Review

    Evaluation of the safety and tolerability profile of Sativex: is it reassuring enough?

    • Derick Wade.
    • Department of Neurological Rehabilitation, Oxford Centre for Enablement, Oxford, England. derick.wade@noc.anglox.nhs.uk
    • Expert Rev Neurother. 2012 Apr 1;12(4 Suppl):9-14.

    AbstractThe adoption of new drug therapies involves an assessment of risk:benefit based upon the best clinical evidence, including clinical trials but also everyday clinical practice data collection. However, in the case of Sativex, a cannabinoid medicine containing the two main active ingredients of cannabis, δ-9-tetrahydrocannabinol and cannabidiol, the picture is somewhat clouded by preconceived views regarding the world's most widely used illicit drug, herbal cannabis. In this review, I aim to look beyond these preconceptions and evaluate the body of published data concerning this medicine currently approved in different countries for the management of one of the most frequent and disabling symptoms associated with multiple sclerosis, spasticity. In particular, data relevant to areas of concern such as tolerability, safety, psychoactivity, effects on withdrawal (including possible drug tolerance) and finally the potential for abuse/dependence are evaluated. Balancing these risk factors, the main positive clinical data published over the years by the Oxford Centre for Enablement, following on from the first pilot study in 2004, are presented. Based upon our experience, the benefits that are seen initially with Sativex when treating multiple sclerosis spasticity patients are generally maintained during long-term treatment. Furthermore, following withdrawal of Sativex, symptoms often return, but, beyond this, sudden cessation is generally safe with no evidence of physiological or psychological dependence. Dose escalation has not usually been observed in clinical trials or clinical practice after the first titration weeks. Adverse effects occur relatively frequently, but they are usually mild to moderate in intensity and rarely require drug discontinuation. Overall, Sativex appears to be well-tolerated and a useful addition for patients who have failed treatment with traditional antispastic agents.

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