IncobotulinumtoxinA (Xeomin) is a botulinum toxin type A preparation free from complexing proteins, i.e. free from proteins other than the active toxin. Injected into the muscle, incobotulinumtoxinA (Xeomin) causes local weakening. Botulinum toxin type A is widely used for treatment of various neurological conditions. This study will investigate the efficacy and safety of incobotulinumtoxinA (Xeomin) in the treatment of post-stroke spasticity of the upper limb.