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Carbidopa is a medication used in the management and treatment of Parkinson disease (PD). It is in the decarboxylase inhibitor class of drugs. Carbidopa is indicated for combination use with levodopa (L-dopa) for the treatment of motor symptoms encountered in Parkinson disease (PD), post-encephalitic parkinsonism, and parkinsonism symptoms resulting from intoxication by carbon monoxide or manganese. This activity reviews the indications, mechanism of action, and contraindications for carbidopa as a valuable agent in managing PD symptoms. This activity will highlight the mechanism of action, adverse event profile, and other key factors pertinent to interprofessional team members in managing patients with PD and related conditions. Objectives: Identify the mechanism of action of carbidopa. Describe the potential adverse effects of carbidopa. Review the appropriate monitoring for patients receiving carbidopa. Summarize interprofessional team strategies for improving care coordination and communication to advance carbidopa and improve outcomes. Access free multiple choice questions on this topic.

There is little data to suggest a possibility for or symptoms of carbidopa toxicity. However, reported data indicate that carbidopa/levodopa intestinal gel infusion can cause significant damage to small nerve fibers leading to pain and sensory discomfort.[12]

It is important to understand the indications and use of carbidopa along with levodopa for the treatment of Parkinson disease and parkinsonism motor symptoms. Determining patient-specific formulations and dosage is key to its effective use. Carbidopa can decrease peripheral side effects and lower the effective dose of levodopa, but it is essential to recognize adverse effects and toxicity to adjust dosages and medication combinations as needed. Carbidopa/levodopa is among the most effective medical treatments for PD patients, but because of the “on/off” fluctuations and wearing off that occurs, it is often reserved for later in the disease course. For example, a patient may be started on an MAO-B inhibitor for early disease symptoms and transitioned to a dopamine agonist once noticeable functional impairment occurs. When additional therapy is required, carbidopa/levodopa is a therapeutic option. From that point, determining the proper administration methods and drug combinations is crucial to providing the patient with the most effective care. This is where the prescriber would do well to consult a pharmacist, particularly a board-certified pharmacotherapy specialist, who can guide agent selection and dosing and counsel the patient on adverse events and side effects. It is also relevant to note that deep brain stimulation can be another option when medication alone is not enough to control symptoms.[13] If the patient is working with a physical therapist, they should also be kept informed regarding all the patient's medications so they can administer their care in light of medication changes. Clinicians who prescribe separate doses of carbidopa and levodopa should thoroughly explain the directions for the use of each drug to the patient. As an interprofessional health care team, it is crucial to understand treatment algorithms and allow patients to know their options, particularly as their disease progresses, which is why interprofessional collaboration and communication with other team members and accurate documentation of the patient's status in their medical record are vital to optimal patient outcomes. [Level 5]