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  • Review Article
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Repeat botulinum toxin-A injections for treatment of adult detrusor overactivity

Abstract

Intravesical injections of botulinum toxin-A have become established as an effective therapy in the management of neurogenic and idiopathic detrusor overactivity that is refractory to treatment with anticholinergic medication. The effects of the toxin are finite and repeated injections are required to sustain the beneficial therapeutic effects. The available data suggest a reproducible and sustained improvement in symptoms as well as urodynamic parameters following repeated injections of botulinum toxin-A. The reported incidence of adverse events is low and resistance to the toxin is uncommon. The timing of repeat injections within the published data is variable, reflecting differing practise among clinicians, but is typically 6–12 months. Larger scale studies are still required to clarify the usefulness of botulinum toxin-A as a long-term treatment in the management of detrusor overactivity.

Key Points

  • Repeated intradetrusor injections of botulinum toxin-A are being used as a long-term management strategy for some patients with detrusor overactivity

  • Repeated injections of botulinum toxin-A can maintain the symptomatic improvement derived from the initial treatment in many patients with neurogenic or idiopathic detrusor overactivity

  • The incidence of serious adverse events such as weakness distant from the site of injection seems to be low

  • Reported rates of treatment failure following repeated injections seem to be low, although current data are short term and incomplete

  • Re-injection is generally at the request of the patient, although in some patients adverse cystometric changes can be used as criteria for re-treatment

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Acknowledgements

The authors are writing on behalf of the GKT Botulinum Study group, and would like to thank the Urology Foundation, and Kamran Ahmed for his help with this Review. P. Dasgupta and A. Sahai acknowledge financial support from the Department of Health via the National Institute for Health Research (NIHR) comprehensive Biomedical Research Centre award to Guy's & St Thomas' NHS Foundation Trust in partnership with King's College London and King's College Hospital NHS Foundation Trust. They also acknowledge the support of the MRC Centre for Transplantation.

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Contributions

C. Dowson and A. Sahai researched data for, and wrote, the article. All authors were involved in the discussions of content and review/editing of the manuscript before submission. P. Dasgupta, M. S. Khan and A. Sahai reviewed and edited the article before submission.

Corresponding author

Correspondence to Arun Sahai.

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Competing interests

The authors declare an association with Allergan Ltd: Grant support (all authors), Consultant (P. Dasgupta), Speakers bureau (honoraria) (A. Sahai).

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Dowson, C., Khan, M., Dasgupta, P. et al. Repeat botulinum toxin-A injections for treatment of adult detrusor overactivity. Nat Rev Urol 7, 661–667 (2010). https://doi.org/10.1038/nrurol.2010.187

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