Trade Names:Lodosyn- Tablets 25 mg
Inhibits peripheral decarboxylation of levodopa, making more levodopa available for transport to brain.
Has no effect as single agent. For use with levodopa in treatment of idiopathic Parkinson disease, postencephalitic parkinsonism and symptomatic parkinsonism associated with carbon monoxide or manganese poisoning.
Reduction of breakdown of L-5-hydroxytryptophan for treatment of postanoxic intention myoclonus.
Hypersensitivity to carbidopa or levodopa.
PO in 1:10 ratio to levodopa (eg, 10 mg carbidopa/100 mg levodopa) 3 to 4 times daily. With regimen of 1 mg carbidopa/100 mg levodopa, additional 12.5 to 25 mg carbidopa may be administered every day or every other day with first dose if needed. With regimen of 25 mg carbidopa/250 mg levodopa, 12.5 to 25 mg carbidopa may be added by 1/ 2 to 1 tablet every day or every other day to max of 8 tablets/day (2 tablets 4 times daily) for optimal therapeutic response (max, 200 mg/day).Initiating combination therapy
Do not give carbidopa and levodopa together until at least 8 h after last dose of levodopa was taken alone. Lower levodopa dose to 20% to 25% of previous daily dose and administer both drugs at same time.
Administer with food to reduce GI upset.
Store in light-resistant container at room temperature.
None well documented (see Levodopa ).
May cause false-positive test result for urinary ketones when test tape is used to determine ketonuria. False-negative test results may occur with glucose-oxidase methods of testing for urinary glucose.
Only adverse reactions seen with carbidopa have been associated with combined use of carbidopa and levodopa.
If patient experiences any CNS effects (eg, uncontrollable movements of the face, eyelids, mouth, tongue, neck, arms, hands or legs; mood or mental changes) notify health care provider.
Undetermined. Do not administer to breast-feeding mothers.
Safety and efficacy not established for children younger than 18 yr of age.
May require lower doses of carbidopa/levodopa.
Dyskinesias caused by levodopa may occur sooner or at lower doses of levodopa when levodopa and carbidopa are given concomitantly than when levodopa is administered alone.
Muscular rigidity, fever, mental changes and increased serum CPK may occur when dose of levodopa is reduced abruptly or discontinued.
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