Mirapex is a drug used to treat Parkinson's disease by boosting dopamine levels in the brain. Parkinson's disease results from the loss of dopamine-producing neurons and causes movement issues. Mirapex, also called pramipexole, is a dopamine agonist that works similarly to dopamine in the body. Common side effects include muscle spasms and dizziness. The initial dose is 0.125 mg taken three times daily with food and the dose may be increased over time based on effectiveness and tolerance.