Compound Monograph
Levodopa
Levodopa is an amino acid precursor of dopamine, found in velvet bean and used as the mainstay treatment for Parkinson's disease.
Classification
Levodopa is an amino acid (catecholamine precursor), part of the amino acids & proteins class. Amino acids, peptides, and proteins — including directly bioactive free amino acids and plant proteins.
Where Does It Come From? (2)
Levodopa is a naturally occurring (and made in the body) amino acid (catecholamine precursor), found in Velvet bean and Broad bean. It is flagged as moderately toxic.
Research & Evidence
Levodopa (L-DOPA) is a naturally occurring amino acid that the body makes on the path to producing the neurotransmitter dopamine. Unlike dopamine itself, it can cross the blood-brain barrier, which makes it the single most effective and widely used treatment for the motor symptoms of Parkinson’s disease, usually given in combination with a peripheral decarboxylase inhibitor. It occurs naturally in velvet bean (Mucuna pruriens), which has been used traditionally and is sometimes marketed as a natural source.
Toxicity & Safety
Levodopa commonly causes nausea, low blood pressure on standing and, with long-term use, involuntary movements (dyskinesias) and fluctuations in response. It can interact with monoamine oxidase inhibitors and with high-protein meals, and it should be managed by a clinician; abrupt withdrawal can be hazardous. Doses from natural sources such as velvet bean are difficult to standardise.