ex Carbidopa-Levadopa (Sinmet)
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MOA
•Levodopa is precursor to dopamine, it does not cross the BBB.
•Carbidopa-levadopa diffuses levodopa into the CNS, where it is converted in dopamine
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Side effects
•GI, orthostatic hypotension, Abnormal movements-”bruxism, ballismus”
Bradykinetic episodes- known as “on-off”NMS (non motor symptoms)
Hyperventilation, bizarre breathing patterns, hoarseness, increased nasal secretions.
Interactions
–MAOI, TCA, phenothiazines, pyridoxine
Contraindications
•History of sensitivity
•Undiagnosed pigmented lesions or history of melanoma.
•Closed angle glaucoma
•Caution-cardiac disease, MI, pulmonary, DM, PUD, history of psychiatric disorders
Education
•Oral administration starts to take effect in 1-2 months but may take 6 months for noticeable effects
•Patients should avoid **high protein diet** and avoid foods with **large amounts of pyridoxine**. (ex fish, beef liver and other organ meats)
•Lose effectiveness after 2 to 5 years of therapy