Pramipexole has some of the same effects as a chemical called dopamine, which occurs naturally in your body. Low levels of dopamine in the brain are associated with Parkinson's disease. Pramipexole is used to treat symptoms of Parkinson's disease, such as stiffness, tremors, muscle spasms, and poor muscle control. Pramipexole is also used to treat restless legs syndrome (RLS). Pramipexole may also be used for purposes not listed in this medication guide.