Carbidopa Disease Interactions

Carbidopa-levodopa products are contraindicated in patients with narrow-angle glaucoma.

Caution and observation is recommended when treating patients with carbidopa, as depression with concomitant suicidal tendencies may develop or be exacerbated.

Patients treated with products containing carbidopa and levodopa report excessive somnolence and falling asleep while engaged in daily activities, sometimes with no warning sign of drowsiness. Advise patients about the risks, especially those suffering from sleep disorders or using concomitant sedating medications.

Dopamine agonists may impair the systemic regulation of blood pressure, with resultant orthostatic hypotension at any time, but especially during dose escalation. Additionally, patients with Parkinson's disease may have an impaired capacity to respond to an orthostatic challenge. For these reasons, patients with Parkinson's disease (or restless legs syndrome) who are being treated with dopaminergic agonists typically require careful monitoring for signs/symptoms of orthostatic hypotension, especially during dose escalation, and should be advised of this risk.

Ordinarily, patients with major psychotic disorder should not be treated with dopaminergic antiparkinsonian agents, because of the risk of exacerbating psychosis. Hallucinations and psychotic-like behavior have been reported with dopaminergic medications. In addition, certain medications used to treat psychosis may exacerbate the symptoms of Parkinson's disease and may decrease the effectiveness of these drugs. The use of bromocriptine in patients with severe psychotic disorders is not recommended.