Botulinum toxin as treatment for focal dystonia: a systematic review of the pharmaco-therapeutic and pharmaco-economic value

• Published in: Journal of neurology Vol. 259; no. 12; pp. 2519 - 2526
• Main Authors: Zoons, E., Dijkgraaf, M. G. W., Dijk, J. M., van Schaik, I. N., Tijssen, M. A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer-Verlag 01.12.2012; Springer; Springer Nature B.V
• Subjects: Animals; Biological and medical sciences; Botulinum toxin; Botulinum Toxins - economics; Botulinum Toxins - therapeutic use; Cost analysis; Cost estimates; Cost-Benefit Analysis - economics; Diseases of striated muscles. Neuromuscular diseases; Dystonia; Dystonic Disorders - drug therapy; Dystonic Disorders - economics; Dystonic Disorders - psychology; Employment - economics; Humans; Medical sciences; Medicine; Medicine & Public Health; Muscle contraction; Neurology; Neuroradiology; Neurosciences; Observational studies; Quality of life; Quality of Life - psychology; Review; Systematic review; Treatment Outcome; Netherlands; Focal dystonia; Botulinum toxin; Effectiveness; Nervous system diseases; Enzyme; Metalloendopeptidases; Involuntary movement; Cerebral disorder; Peptidases; Striated muscle disease; Bontoxilysin; Treatment; Central nervous system disease; Hydrolases; Dystonia; Neurological disorder; Extrapyramidal syndrome
• ISSN: 0340-5354; 1432-1459
• DOI: 10.1007/s00415-012-6510-x

Focal dystonia is a common, invalidating neurologic condition characterized by involuntary, sustained muscle contractions causing twisting movements and abnormal postures in one body part. Currently, botulinum toxin is the treatment of first choice. We performed a systematic review towards the pharmaco-therapeutic and pharmaco-economic value of botulinum toxin as treatment for focal dystonia, which yielded the following results. Botulinum toxin is the most effective treatment for reducing dystonic symptoms measured with dystonia-specific and general questionnaires, and pain in patients with focal dystonia. Seventy-one percent of patients with cervical dystonia had a reduction in neck pain compared to 12 % in placebo groups. Adverse events occur in 58 % of patients during treatment with botulinum toxin compared to 46 % treated with placebo. Especially dry mouth, neck weakness, dysphagia, and voice changes are common. Adverse events are usually mild and self-limiting. Health-related quality of life, measured with the SF-36 is 20–50 points lower in patients with focal dystonia compared to controls and the effect of botulinum toxin on health-related quality of life is unclear. Botulinum toxin treatment is expensive because the drug itself is expensive. Yearly costs for treating a patient with focal dystonia with botulinum toxin range from EUR 347 to EUR 3,633 and the gain in QALYs with BTX treatment is small. Focal dystonia impairs the productivity and the ability to work. At start of botulinum toxin treatment only 47–50 % was working. Botulinum toxin partly improves this. Overall, we conclude that botulinum toxin is an expensive drug with good effects. From a societal perspective, the costs may well weigh up to the regained quality of life. However, the available literature concerning costs, health-related quality of life and labor participation is very limited. An extensive cost-effectiveness study should be performed incorporating all these aspects.