Carbidopa
Lodosyn (carbidopa) is a peripheral DOPA decarboxylase inhibitor used as an adjunct to levodopa therapy in the treatment of Parkinson's disease. It does not treat Parkinson's symptoms on its own but works by preventing the peripheral conversion of levodopa to dopamine, allowing more levodopa to reach the brain and reducing peripheral side effects such as nausea and vomiting.
Lodosyn is a peripheral decarboxylase inhibitor used alongside levodopa to enhance its effectiveness and reduce side effects in Parkinson's disease treatment.
Key facts at a glance
- RxNorm
- 203437
- Generic
- Lodosyn
- Class
- brand-name
- Brands
- —
- Availability
- rx
- Lactation
- unknown
- Routes
- —
- Forms
- —
- Regions
- US, EU, CN, JP
- Monitoring
- —
This page is for informational purposes only.
Do not use this information to diagnose yourself or to replace a physician's advice. Always consult a qualified healthcare provider before starting, stopping, or changing any medication. If you believe you are experiencing a medical emergency, call your local emergency number immediately.
Lodosyn is indicated for use with levodopa (often as carbidopa-levodopa combinations) in the treatment of Parkinson's disease and parkinsonism. It is not effective as sole therapy and is only used to improve the results of levodopa treatment.
Lodosyn inhibits the enzyme aromatic L-amino acid decarboxylase (DOPA decarboxylase) in peripheral tissues. This prevents levodopa from being converted to dopamine outside the brain, allowing more levodopa to cross the blood-brain barrier where it is converted to dopamine in the central nervous system.
Lodosyn must always be used with levodopa; it has no antiparkinsonian effect when given alone. Common side effects include dyskinesias, nausea, and behavioral changes. Patients should not discontinue therapy abruptly. The medication may cause false-positive results in urine glucose tests using cupric sulfate solution.
Official drug label
WellAlly may earn a referral fee from linked resources at no extra cost to you. Editorial content is never influenced by commercial relationships.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed July 26, 2026. · Read our editorial policy