Bromocriptine is used alone or with other medications (such as levodopa) to treat Parkinson's disease. It can improve your ability to move and can decrease shakiness (tremor), stiffness, slowed movement, and unsteadiness. It may also decrease the number of episodes of not being able to move ("on-off syndrome"). Bromocriptine is also used to treat high levels of a certain hormone made by the body (prolactin). High levels of prolactin may cause problems such as unwanted breast milk, missed/stopped periods, difficulty becoming pregnant, decreased sperm production, and decreased sexual ability. Bromocriptine may be used to treat a type of tumor which causes the high levels of prolactin (prolactin-secreting adenomas). It can help to reduce the tumor size. Bromocriptine is not recommended for stopping unwanted breast milk after pregnancy, miscarriage, or abortion because of possible serious side effects (such as high blood pressure, seizure, heart attack, stroke). Bromocriptine is also used to treat high levels of growth hormone (acromegaly). Bromocriptine is an ergot medication that works by acting like a certain natural substance (dopamine) in the brain. It also prevents the release of certain hormones (growth hormone, prolactin). Bromocriptine can lower these hormone levels, but it does not cure the causes of the increased levels.