The drug called L-dopa:

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L-dopa is a precursor to dopamine, a neurotransmitter that is important for the regulation of movement, mood, and cognition. L-dopa can cross the blood-brain barrier and be converted to dopamine in the brain, making it a useful medication for the treatment of Parkinson's disease, which is characterized by a loss of dopamine neurons. L-dopa is not used to treat schizophrenia and does not block pain signals. It is also not found in all sensory neurons.

The Drug Called L-Dopa