click below
click below
Normal Size Small Size show me how
Parkinsons treatment
| Question | Answer |
|---|---|
| At what age does Parkinsons disease usually begin? | between 45-65 years old |
| what are the common symptoms associated with parkinsons disease | tremors, rigidity, bradykinesia, postural and gait abnormalities |
| Is mental capacity affected by Parkinsons? | No, facial expression is affected |
| Due to affected facial expression in pt. with Parkinsons, what symptoms may occur | less blinking, reduced facial expressions, drooling, impaired swallowing, soft and difficult annunciation |
| What is the cause of parkinsons disease in terms of physiological function | decrease of inhibitory dopaminergic neurons causing an imbalance between dopamine/acetylcholine |
| How is Parkinsons disease treated? | cannot stop degeneration of dopaminergic neurons of reverse the disease but can relieve symptoms by increasing dopamine levels while blocking effects of ACh |
| what is the MoA of levodopa/carbidopa? | levodopa is converted to dopamine in CNS by dopaminergic neurons and once they run out of active neurons they cannot convert the drug Carbidopa blocks peripheral conversion of levodopa to dopamine, but carbidopa itself does not cross BBB |
| What are some of the adverse effects of levodopa/carbidopa | N/V, constipation, Ortho hypotension, cardia dysrhythmias, restlessness, insomnia, confusion, pychihatric disturbances, dyskinesias (chorea, athetosis, dystonia, tremor, tics, myoclonus), on-off phenomenon (abrupt fluctuations in severity of symptoms) |
| What is the on-off phenomenon | abrupt transient fluctuations in severity of symptoms specific to levodopa/carbidopa: Bradykinesia/dyskinesias seen after long term therapy |
| What are the common Drug interactions with levodopa/carbidopa? | Dopamine blockers worsen Parkinsons, Antipsychotics (1st gen. antipsych) produce parkinsonian symptoms |
| what drugs block dopamine receptors in vomit center of CNS and therefore interact negatively with levedopa/cabidopa | antiemetics (Reglan and Compazine, phenergan) |
| What are the common COMT-inhibitors (Catechol Omethyltransferase Inhibitors? | entacapone (Comtan), levodopa, carbidopa, entacapone (Stalevo) |
| What is the MoA of COMT-inhibitors | target metabolizer of levodopa, COMT |
| What is the therapeutic use of COMT-inhibitors | combined w/ levadopa/cardopa to reduce on/off phenomenon and more sustained/consistent CNS dopamine levels |
| What are the adverse effects of COMT-inhibitors | Peripheral and CNS domaninergic AE and diarrhea and hallucinations |
| What are teh common dopamine receptor agonists | Ropinirole (Requip) & Pramipexole (Mirapex) |
| what is the MoA for Dopamine receptor agonists? | to directly stimulate dopamine receptors |
| Which drug is FDA approved for restless leg syndrome | Dopamine receptor agonists - Pramipexole (Mirapex) and Ropinirole (Requip) |
| What are the most common Monoamine Oxidase-B inhibitors used? | Selegiline (eldepryl, Zelapar) |
| What is the MoA for Monoamine Oxidase-B inhibitors | selectively inhibits enzyme that breaks down dopamine (MAO-B), so it increases the levels of dopamine, but does not inhibit breakdown of norepinephrine, serotonin, and tyramine (moa-a) |
| What is the difference between MOA-Inhibitors and MOB-Inhibitors? | MOB-inhibitors do not have food/drug interactions like MOA-I, but at higher doses they lose their selectivity |
| What is the most common Adverse Effect of MOB-I? | insomnia |
| What drugs interact with MOB-Is | dextromethorpha, pseudophedrine, tramadol, and meperidine |
| What is the MoA of Amantadine (symmetrel) | antiviral agent that enhances synthesis, release, or re-uptake of dopamine |
| what is the therapeutic use of amantadine | treats mild symptoms of Parkinson's disease and respiratory flu but is less effective than levodopa and tolerance is more rapid |
| How is Benztropine used to treat Parkinsons disease? | it is an anticholinergic agent that antagonizes ACh and treats mild parkinsons |
| Which drug is used alone in MILD Parkinsons disease but usually used with dopamine active meds? | Anticholinergic Agents |
| Which Anticholinergics are most commonly used to treat antipsychotic EPSE | Benztropine |