Exam 3 Neuro Part 2 & 3 Drugs Flashcards
what are the three ways PD can be treated
- dopamine replacement therapy
- dopamine agonist therapy
- anticholinergic therapy
what are the different types of dopamine replacement therapy to treat PD
- levodopa-carbidopa (Sinemet)
- MAO-B Inhibitors
- COMT inhibitor
- Amantadine
what are the different types of dopamine agonists to treat PD
- Amantadine
2. dopamine agonists
what are the long term effects of dopamine replacement
MOVEMENT RELATED COMPLICATIONS
- dyskinesia
- motor fluctuations (wearing off phenomenon, on-off medication state)
as many as 84% have reported issues
what is the first like option of treatment for PD
levodopa-caribidopa (sine met)
and
dopamine agonists
what is the MOA of levodopa-caribidopa
levodopa: precursor to dopamine that can cross BBB and has CNS action
carbidopa: stops breakdown of 1-dopa to dopamine in periphery so more 1-dopa crosses BBB
levodopa-caribidopa AE
- motor disturbances
- end dose “wearing off” so stiffness and rigidity return
- med not having an effect due to absorption issues
- freezing
- “on” period dyskinesia (must differentiate from PD tremors)
MAO-B inhibitors MOA
inhibits monoamine oxidase B which typically breaks dopamine thus increasing dopamine levels in CNS
Indication of MAO-B
usually used after levodopa-carbidopa and dopamine agonists for PD
both approved adjunct therapy to reduce end dose wearing off with 1-dopa
types of MAO-B inhibitors
selegiline PO and Rasagiline
COMT inhibitor MOA
inhibits COMT which intern decreases breakdown of 1-dopa
MAO-B inhibitors AE
Seleginine PO: has first pass metabolism and increases hallucinations, insomnia, jitteriness
Rasagiline: approved mono therapy but is less effective
COMT inhibitor AE
involuntary movements, nausea
COMT inhibitor indication
used as adjunct therapy to reduce end of dose wearing off with 1-dopa
but overall less commonly used
Amantadine MOA
unknown
possibly increases dopamine release or may have direct affect on dopamine neurons
Amantadine AE
confusion hallucinations diziiness dry mouth constipation lived reticularis
Amantadine indication
was previously used for flyu
usually in early disease management, younger people usually respond better
modest mono therapy benefit and adjust therapy to reduce dyskinesias with 1-dopa
dopamine agonists MOA
binds to and agonizes dopamine receptors
dopamine agonists drug
ropinirole (Requip)
dopamine agonists AE
nausea, drowsiness, dizziness, syncope
monitor for lightheadedness and postural hypotension, hallucinations, lower-extremity edema
less common: impulsive behavior, sleep attacks
dopamine agonist indication
first line treatment
used as mono therapy esp in younger pts and adjunct therapy to reduce end of dose wearing off with 1-dopa
anticholingeric therapy for PD MOA
antagonizes muscarinic receptors to prevent acetylcholine binding
anticholingeric therapy for PD AE
anticholinergic effects
anticholingeric therapy for PD indication
used as mono therapy or adjunct treatment specifically for tremor
limited use bc of AEs and modest benefit
istradefylline (Nourianz) indication
new drug for PD
istradefylline (Nourianz) class
A2A receptor antagonist
istradefylline (Nourianz) MOA
blocks adenosine A2A receptor in the basal ganglia (region which controls movement)
exact MOA is unknown
istradefylline (Nourianz) indication
used as add therapy to levodopa/carbidopa to treat “off” episodes
istradefylline (Nourianz) AE
worsening dyskinesia
what are the 2 aspects to MS treatment
- disease modifying therapies
2. symptom management
interferon B (IFN-B) indication
used submit or IM to treat relapsing MS to decrease exacerbations and delay accumulation of physical disability