Antipsychotic Flashcards
What are the two classes of antipsychotics?
First generation = “conventional” or “typical”
Second generation = “atypical”
What are the pathways associated with antipsychotic efficacy?
Hyperactivity of DA neurons in the mesolimbic pathway
Deficiency of DA in the mesocortical pathway
Which Da pathway are positive and negative sx?
Mesolimbic = positive Mesocortical = negative
What receptors do most antipsychotic medications target?
D2 blocker
What receptors do antipsychotics block?
Histamine-1
Alpha-1
Muscarinic cholinergic
What motor SE are produced from antipsychotics?
TD
EPS
What happens if we block the mesolimbic pathway?
Improve positive sx of schizophrenia
What happens if we block the mesocortical pathway?
Worsening of negative sx (cognitive slowing/blunting)
What happens if we block the nigrostriatal pathway?
EPS
What happens if we block the tuberoinfundibular pathway?
Increase in prolactin/ hyperprolactinemia
What does EPS include?
Dystonia
Akathisia
Pseudoparkinsonism
TD
When is EPS more common?
FGA
What is acute dystonia?
Muscular rigidity and cramping often involving the neck, tongue, and face
What is the treatment of acute dystonia?
Removal of offending agent
Anticholinergics/benzo
What is akathisia?
Subjective feeling of intense restlessness (shaking/twitching/fidgeting)
What is the treatment of akathisia?
Removal of offending agent
Anticholinergic/propranolol
What is pseudoparkinsonism?
Bradykinesia
Ridigity
Cogwheeling
Tremor
What is the treatment of pseudoparkinsonism?
Removal of offending agent
Anticholinergics
Amantadine (DA)
What is tardive dyskinesia?
Long-standing or permanent abnormal involuntary movements
What is the treatment of TD?
Removal of offending agent
VMAT-2 inhibitors
What is neuroleptic malignant syndrome (NMS)?
“lead pipe” rigidity
Fever
Autonomic instability
Elevated WBCs
What is the treatment of NMS?
Removal of offending agent
Supportive care
What drug causes QTc prolongation?
Haloperidol
How are antipsychotics connected to mortality?
Increased mortality in elderly patients treated for dementia-related psychosis
How long should antipsychotics be used?
Shortest duration possible
What is the MOA of second generation antipsychotics?
D2 antagonism plus “selectively modifying” effects of serotonin antagonism
What SE are reduced in second from first generation antipsychotics?
Reduced risk of causing EPS and TD
Do not raise prolactin levels
Improve negative symptoms more than conventional antipsychotics
What are the SE of SGA?
Wt gain
Diabetes
Dyslipidemia
What is the most efficacious antipsychotic?
Clozapine
What are the CIs for clozapine?
H/o:
Seizures
Agranulocytosis
What are the warnings for clozapine?
Myocarditis
Cardiomyopathy
CHF
What are the SE of Clozapine
Orthostatic hypotension
Sialorrhea/drooling
Anticholinergic effects
What is the boxed warning for clozapine?
Agranulocytosis
Seizures