Gait disturbances are very common and are a major cause for losing of independency in patients with advanced Parkinson's Disease (PD). The medical treatment of gait disturbances in advanced PD is very difficult and in many cases the classical dopaminergic treatment has no clinical benefit or even can worsen the instability and increase falls. Rasagiline, a new MAO-B inhibitor who has recently been approved all over the world for the treatment of early and late stages PD has been suggested to have a special effect of gait in patients with advanced PD (LARGO sub-study).