Aims: The introduction of Botulinum toxin type A (BTA) in the treatment of spasticity in adults was a large step forward in neurology and it is currently seen as the first choice treatment in focal spasticity. In an attempt to achieve the optimisation of this therapeutic resource, different clinical guidelines have been drawn up which include reviews of the evidence available about the indications and use of BTA. Spasticity is characterised by the presence of involuntary muscular hyperactivity that is often associated to pain, deformity and functional disability. From the clinical point of view, the advantages of BTA are obvious (ease of use and dosage determination, long lasting effects, reversibility should the response be inappropriate, etc.) and far outweigh its drawbacks. It can only be used after a proper selection of patients, of the therapeutic aims and of the muscular areas to be treated, and a tailor-made programme of rehabilitation must also be drawn up. Increasing experience in its use suggests that its early administration is effective in preventing or reducing the complications arising from spasticity.
Conclusions: BTA is effective in the treatment of spasticity and plays a significant role if the clinical objectives involve functional aspects. At present a large amount of well-documented experience concerning its indications, effects and safety in clinical practice is already available.