Neurodegenerative Disease Flashcards
Levodopa
Parkinsons
Levodopa MOA
metabolic precursor to Dopamine. Becomes dopamaine to restore post-synaptic concentration of dopamine. Activates post-synaptic D1 and D2 receptors
Carbidopa
inhibits dopa decarboxylase to allow levodopa to enter the BBB
Levodopa contraindications
MAOI use, history of malignant melanoma, narrow angle glaucoma. Monitor LFT
Levodopa ADR
Dyskinesias, “on-off” effect, Nausea, anorexia, hypotension, confusion, insomnia, nightmares, schizophrenic like syndrome
Dopamine Agonists
apomorphine, bromocriptine, pergolide, pramipexole, ropinirole, rotigotine
Dopamine Agonists ADR
N/V, anorexia, hypotension, cardiac arrythmias, HA, confusion, hallucinations, sedation, pulmonary fibrosis
Ergot Dopamine Agonists
Bromocriptine and Cabergoline. D2 receptor agonists
NonErgot Dopamine Agonists
Pramipexole, Ropinerole, Rotigotine (patch), Apomorphine
Pramipexole indications
advanced Parkinsons and restless leg syndrome
Ropinerole indications
monotherapy in mild parkinsons and restless leg syndrome
Rotigone ADR
sudden somnolence
Apomorphine receptor type
D1/D2
Pramipexole receptor type
D3. some D2/D4
Ropinerole receptor
D2
Apomorphine indications
subQ injection for temporary relief of “off” periods
Apormorphine ADR
dyskinesias, drowsiness, sweating, hypotension
Selegiline MOA
monoamine oxidase- B inhibitors
Selegiline indications
effective as monotherapy or in combination with levodopa for parkinsons. enables reduction in levodopa
Selegiline ADR
blocks MAO-A at high doses, fatal hyperthermia
Rasagiline MOA
irreversible MAO-B inhibitor
Rasagiline indications
early treatment of Parkinsons and as adjunct with Levodopa
Rasagiline metabolism
extensive liver metabolism. metabolized at CYP1A2.
Rasagiline Drug interactions
meperidine, dextramethorphan, St. Johns Wort, cyclobenzaprine, ciprofloxacin
Catechol-O-Methyltransferase inhibitors
Tolcapone, entecapone
COMT inhibitors MOA
inhibits metabolism of dopamine. increase availability of Ldopa
COMT indications
adjunct treatment for Parkinsons with levodopa
COMTI ADR
increased plasma concentration of Ldop (dyskinesias, nausea, confusion), Diarrhea, abd pain, orthostatic hypotension, sleep disorders, orange urine discoloration. Tolcapone may be hepatotoxic
COMT pearls
do not use MAO-A and COMT together. MAO-B may be okay. Entacapone=P450 inhibitor. Taper dosing for discontinuation
Stalevo
Levodopa + Carbidopa + entacapone
Amantadine
Antiviral drug with anti-parkinsonian properties
Amantadine ADR
primarily CNS- restlessess, depression, irritability, insomnia, agitation, excitement, hallucinations, confusion, seizures. HA, edema, postural hypotension, HF, GI
Anticholinergics MOA
dopamine def augment excitatory cholinergic system. blocks this system
Anitcholinergics
Trihexyphenidyl and Benztropine
AA of Neuro guidelines
Selegiline first, Levodopa or dopamine agonist, Alternative- exercise, speech therapy
Cholinesterase inhibitors Indications
First line in Alzheimers
Cholinesterase inhibitors
Donezepil, Rivastigmine, Galantamine
Donezepil ADR
Cholinergic side effects , NVD, insomnia, fatigue, muscle cramps
Donezepil interactions
metabolized by P450
Rivastigmine ADR
NVD and weight loss, dyspepsia, sinusitis, dizziness
Galantamine MOA
dual MOA. Competitive inhibition of acetylcholinesterase and allosteric modulation of presynaptic and postsynaptic nicotinic receptors
Galantamine ADR
N, weight loss, agitation and diarrhea
NMDA receptor Antagonists
Memantine
Memantine
noncompetitive NMDA receptor antagonist. increased glutamate release in CNS produces excitotoxic reactions and cell death, idea is to block this.
Memantine ADR
agitation, Diarrhea, insomnia, dizziness, HA, Hallucinations