Is Levodopa (L-DOPA) Safe with L-Tyrosine?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Separate L-Tyrosine supplementation from levodopa doses by at least 2 hours. Discuss any amino acid supplementation with your neurologist, as altered levodopa absorption may worsen Parkinson's symptom control.
Why this interaction occurs
L-Tyrosine and levodopa compete for the same large neutral amino acid transporters in the gut and blood-brain barrier. High L-Tyrosine intake can reduce levodopa absorption and CNS uptake, potentially diminishing its therapeutic efficacy.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 36,403 reports mentioning L-Tyrosine. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the L-Tyrosine + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Levodopa (L-DOPA) interactions → · All L-Tyrosine interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.