Injections of dopamine have been used successfully to treat the symptoms of Parkinson's disease.

Name: Injections of dopamine have been used successfully to treat the symptoms of Parkinson's disease.
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Dopamine cannot cross the blood-brain barrier, so dopamine itself is not used to treat Parkinson's disease. Instead, levodopa (L-DOPA), a precursor to dopamine that can cross the blood-brain barrier, is used to increase dopamine levels in the brain.

Injections of Dopamine Have Been Used Successfully to Treat the Symptoms