Neuropharm Flashcards
Levodopa MOA
Dopamine replacement
Levodopa is converted to dopamine which then activates dopamine receptors
Levodopa Use
Reduce movement disorders
1st line drug
Always combined with carbidopa
May also supplement to a dopamine agonist
Levodopa A/E
Dyskinesia Dark urine/sweat Insomnia Nightmares Dysrhythmias Hallucinations/psychosis
Levodopa A/E early in treatment
N/V
Postural hypotension
Levodopa Drug interactions
Carbidopa, Entacapone: Increase effects
1st gen Antipsychotics: Decrease effects
MAOIs: increase risk for HTN crisis
Levodopa Contraindications
W/O carbidopa
Caution in renal failure
Narrow angle glaucoma
Levodopa Pt edu
Avoid high protein food
↳keep protein intake consistent throughout the day (decreases absorption)
May wear off between doses
Noticeable difference may take weeks - months
Take with food
Levodopa Nursing considerations
Treatment may seem effective initially, but becomes less effective as disease progresses
Carbidopa MOA
Dopamine agonist
Inhibits decarboxylation of levodopa in the intestines and peripheral tissue
Decreases A/E of Levodopa
Carbidopa Max dose
8 tabs/day no matter the strength
Carbidopa A/E
Only from increased absorption of levodopa
Carbidopa Pt edu
Avoid high protein foods
↳ eat consistent amount of protein throughout the day
May wear off between doses
Levodopa Monitoring
Dyskinesia
Other A/E
Carbidopa Monitoring
Dyskinesia
Other A/E
Carbidopa Nursing considerations
Treatment may seem effective initially, but becomes less effective as disease progresses
Carbidopa Drug interactions
Levodopa: decrease A/E of levodopa
Pramipexole MOA
Selectively binds to dopamine D2 and D3 receptors, Activating dopamine receptors, mildly blocks serotonergic and alpha adrenergic receptors
Non ergot dopamine receptor agonist
Pramipexole Use
Monotherapy (only early on) Produces significant motor performance improvement RLS w/ levodopa Reduces motor control fluctuations May reduce levodopa doses
Pramipexole Dose time
2-3 hr before bed
Pramipexole A/E
Nausea Dizziness Daytime somnolence Insomnia Constipation Weakness Hallucinations ❊Sleep attacks ❊Impulse control issues
Pramipexole A/E when Combo with Levodopa
Hallucinations
Daytime sleepiness
Postural hypotension
Pramipexole Contraindications
Compulsive behavior
Decrease dose with significant renal impairment
Pramipexole Drug interactions
Cimetidine
Pramipexole Pt edu
May take weeks to see max benefits
Pramipexole Nursing implementations
Screen for compulsive behavior
Monitor BUN, Cr
Entacapone MOA
Catechol-O-Methyltransferase
Selectively inhibits enzyme COMT, resulting in decreased metabolism of levodopa in intestines and peripheral tissue
Entacapone Use
Prolong half life of levodopa
Prevent wearing off effect of levodopa
Entacapone Max Dose
1600mg /day
Entacapone A/E
Vomiting
Diarrhea
Constipation
Yellow/Orange urine
Entacapone A/E with Levodopa
Dyskinesia Orthostatic hypotension Nausea Hallucinations Sleep disturbances Impulse control disorder
Entacapone Drug interactions
Increase level of other drugs metabolized by COMT
Methyldopa
Dobutamine
Isoproterenol
Entacapone Pt edu
Importance of taking with levodopa/Carbidopa
Entacapone Monitoring
A/E
↳determine if levodopa needs to be adjusted
Selegiline MOA
MAO-B inhibitor
Selectively and irreversibly inhibits MAO-B, which is the enzyme that inactivates dopamine
Selegiline Use
Improves motor function May delay neurodegeneration Can prolong effects of levodopa Recommended in newly diagnosed Mild symptoms
Selegiline Dose time
Right before breakfast or lunch
Selegiline A/E
Insomnia Orthostatic hypotension Dizziness GI symptoms HTN crisis Buccal mucosa irritation with ODT
Selegiline Drug interactions
Tyramine
Sympathomimetics
Meperidine
SSRI
Selegiline Pt edu
Benefits may decline after 12-24 mo
Administer last dose before noon to avoid insomnia
Avoid foods containing tyramine and sympathomimetics
Avoid liquids with ODTs
Selegiline Monitoring
BP
Effectiveness of drug
Donepezil MOA
Cholinesterase inhibitor
Inhibits the breakdown of acetylcholine by acetylcholinesterase, increasing acetylcholine available at the cholinergic synapses
Donepezil Use
Mild, Moderate and Severe AD
Donepezil Drug interactions
1st gen Antihistamines (bronchoconstriction)
TCA
1st gen Antipsychotics
Other anticholinergics
Donepezil A/E Most common
HA Dizziness Vertigo Insomnia N/V/D
Donepezil A/E Most severe
Bronchoconstriction
Bradycardia (r/f falls and syncope)
Sick sinus syndrome
Donepezil Contraindications
Asthma
COPD
Liver and heart disease
Donepezil Pt edu
Not a cure, will slow progression
A/E risk increase with higher doses
Takes about 1-3 mo to see effects
Take with food
Donepezil Monitoring
Effectiveness Bronchoconstriction HR Titrate carefully Start low go slow
Memantine MOA
NMDA receptor antagonist
Regulates Ca uptake into cells, preventing toxic levels of Ca from blocking memory formation
Memantine Use
Moderate to severe AD
Memantine A/E
Dizziness HA Confusion Constipation Diarrhea HTN Hypotension
Memantine Drug interactions
Other NMDA antagonist
Sodium bicarbonate
❊Caution with drugs that alkalinize urine (kidney problems)
Memantine Caution
Renal/ hepatic impairment due to alkaline urine
Memantine Pt edu
May see improvement of Sx
Memantine Monitoring
BUN
Cr
Phenytoin MOA
Blocking sodium entry into neurons decreases activity of neurons that produce seizures
Phenytoin Use
Partial seizure
Generalized tonic-clonic seizures
Dysrhythmias
Phenytoin A/E
Nystagmus Sedation Ataxia Diplopia Cognitive impairment Gingival hyperplasia Measles like rash Bleeding tendencies in newborns Dysrhythmias IV admin Hypotension IV admin
Phenytoin Contraindication
HLA-B*1502 genetic mutation
Phenytoin Pregnancy Cat.
D
Phenytoin Drug interactions
PO contraceptives Warfarin Glucocorticoids Diazepam Isoniazid Cimetidine ETOH Valproic acid Carbamazepine Phenobarbital Barbiturates CNS depressants
Phenytoin Pt edu
Good oral hygiene
Take 0.5 folic acid daily
Birth control
Avoid ETOH and other CNS depressants
Phenytoin Screening
Suicide risk
Phenytoin Monitoring
LFT
A/E
Drug level (10-20)
Carbamazepine MOA
Suppresses high frequency neuronal discharge in and around seizure focus
Carbamazepine Use
Partial seizures (1st choice)
Tonic-Clonic seizures
Symptomatic control of BPD
Trigeminal and glossopharyngeal neuralgias
Carbamazepine A/E
Nystagmus Blurred vision Diplopia Ataxia Vertigo Unsteadiness HA Bone marrow suppression (fever, sore throat, infection) Leukopenia Anemia Thrombocytopenia (bruising) Hypo-osmolarity Measles like rash SJS, TENS (dermatologic) in Asians Hyponatremia
Carbamazepine Drug interactions
BC Warfarin Phenytoin Phenobarbital Grapefruit juice
Carbamazepine Contraindications
Pre-existing hematologic abnormalities
HLA-B*1502 gene mutation
Carbamazepine Pregnancy cat.
D
Carbamazepine Pt edu
Tolerance will decrease A/E after a few wk
Take biggest dose at bedtime
Avoid grapefruit juice
Take with meals
Carbamazepine Screening
Suicide
HLA-B*1502 in Asians
Carbamazepine Monitoring
LFT
CBC
BMP
Valproic Acid MOA
Suppresses high frequency neurons targeting sodium channels, preventing Ca from entering Ca channels, may enhance inhibitory influence of GABA
Valproic Acid Use
Seizures (ALL)
BPD
Migraine HA
Valproic Acid A/E
N/V Indigestion Hyperammonemia Rash Wt gain Hair loss Tremor Blood dyscrasia
Valproic Acid Toxicity
Hepatotoxic
Pancreatitis
Valproic Acid Drug interactions
Phenobarbital Phenytoin Topiramate (hyperammonemia) Carbapenem Meropenem and Imipenem/Cilastatin ETOH
Valproic Acid Pregnancy Cat.
D
Valproic Acid Contraindications
Combination with other drugs under the age of 2 because of fatal liver injury
Pre-existing liver dysfunction
Valproic Acid Pt edu
Take with food S/S of liver failure and pancreatitis BC Women of childbearing age should take folic acid Swallow whole
Valproic Acid Screening
Suicide
Valproic Acid Monitoring
LFT
Lipase
Amylase
Therapeutic effect
Phenobarbital MOA
Binds to GABA receptors, leading to receptors to respond to GABA more
Phenobarbital Use
Partial seizures Tonic- Clonic seizures IV for generalized convulsive status epilepticus Sedation Sleep aid Last resort due to A/E
Phenobarbital A/E
Lethargy/ drowsiness (MC) Depression Learning impairment Paradoxical response in children Agitation and confusion in elderly Dependance Acute intermittent porphyria Bleeding tendencies in newborns Rickets Osteomalacia Nystagmus Respiratory depression leading to death
Phenobarbital Drug interactions
BC
Warfarin
Other CNS depressants (ETOH, Valproic Acid)
Phenobarbital Contraindications
History of intermittent porphyria
Suicidal tendencies
Phenobarbital Pregnancy cat.
D
Phenobarbital Pt edu
Doses for seizures are not normally high enough for addiction
As tolerance builds, drowsiness with decrease, take at night
Limit or avoid Alcohol
Dont D/C abruptly
May take wks to reach therapeutic level
Can supplement Vit D/Ca
Take at night due to drowsiness
Phenobarbital Screening
Suicide
Phenobarbital Monitoring
Nystagmus Ataxia CNS depressants Plasma Drug level (15-40) LFT BUN Cr
Gabapentin MOA
May enhance GABA release, precise MOA is unknown
Gabapentin Use
Adjunct therapy for partial seizures Posthepatic neuralgia Monotherapy of partial seizures Neuropathic pain Migraine prophylaxis Fibromyalgia Postmenopausal hot flashes
Gabapentin A/E
Somnolence Dizziness Ataxia Fatigue Nystagmus Peripheral edema
Gabapentin Contraindications
Decrease dose with renal impairment
Gabapentin Pregnancy cat
C
Caution with breastfeeding
Gabapentin Pt edu
A/E diminish with prolonged use
Avoid driving until effects are known
Gabapentin Screening
Suicide
Gabapentin Monitoring
BUN
Cr
Levetiracetam MOA
Chemically and pharmacologically different than other AEDs
MOA is unknown
Levetiracetam Use
Adjunct therapy of myoclonic seizures Partial onset seizures Primary generalized tonic-clonic seizures Migraines BPD Pedi epilepsy
Levetiracetam A/E
Drowsiness
Weakness
Suicidal ideations
Levetiracetam Contraindications
Reduce dose for renal impairment
Levetiracetam Pregnancy cat
C
Avoid in breastfeeding
Levetiracetam Screening
Suicidal