Carbidopa Anhydrous
Carbidopa Anhydrous is a peripheral DOPA decarboxylase inhibitor used almost exclusively in combination with levodopa for the treatment of Parkinson's disease and parkinsonism. By preventing the peripheral conversion of levodopa to dopamine, it increases the amount of levodopa available to cross the blood-brain barrier, enhancing therapeutic efficacy and reducing peripheral side effects such as nausea and hypotension.
Carbidopa is a levodopa companion drug that helps more medication reach the brain by blocking its breakdown in the body.
Key facts at a glance
- RxNorm
- 1545982
- Generic
- Carbidopa Anhydrous
- Class
- pin-variant
- 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.
Primarily used alongside levodopa for idiopathic Parkinson's disease, parkinsonism following encephalitis or manganese intoxication, and symptomatic parkinsonism.
Inhibits peripheral aromatic L-amino acid decarboxylase, preventing conversion of levodopa to dopamine outside the CNS, thereby allowing more levodopa to reach the brain where it is converted to dopamine.
Does not cross the blood-brain barrier; must be administered with levodopa. Reduces peripheral dopaminergic side effects. Typically available as fixed-dose combinations. Use with caution in patients with glaucoma, pheochromocytoma, or history of peptic ulcer disease.
Official drug label
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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 August 27, 2026. · Read our editorial policy