Antipsychotic Agents Flashcards
____ is due to too much neurotransmission due to too many neurotransmitters binding to postsynaptic receptors
Psychosis
The therapeutic goal of psychosis is to block access to post-synaptic receptors by administering a ___ ___
Receptor agonist
Antipsychotics, also known as neuroleptics take control of the _____
Neuron
Prior to 1950, psychotic patients were often ____
Institutionalized
What are three classifications of antipsychotics?
-Traditional or classic agents (1950-1990)
-Atypical agents (or second-generation antipsychotics)
-Third-generation antipsychotics
What are clinical indications for antipsychotics?
-Schizophrenia
-Schizoaffective disorder
-Bipolar disorder
-Acute psychotic symptoms (violence/agitation) or behavioral disturbances related to Tourettes, Senile Dementia, Alzheimer’s disease, etc)
Other uses for phenothiazines and related antipsychotic drugs include…
-Antiemetic/antinausea
-Antihistamine/antipruritic activity
-Potentiation of analgesics, sedatives, and general anesthetics
Schizophrenia is a ____ disease
Debilitating
What are symptoms of Schizophrenia?
-Delusions
-Hallucinations
-Disorganized speech
-Catatonia
-Deficits in attention, memory, or executive function
-Comorbidities (Mood disorders, substance use disorders, anxiety, aggression)
-Depression
-Anxiety
-Aggression
-Hostility
-Hopelessness
-Suicidality
-Flat affect
-Poverty of speech
-Lack of energy
-Lack of interest
-Social withdrawal
All of the symptoms of Schizophrenia lead to ____ and ____ dysfunction
Social and occupational
Excessive _____ activity underlies Schizophrenia
Dopaminergic
Drugs that increase dopaminergic activity (levodopa, amphetamines) ____ schizophrenia or induce a ____
Aggravate; psychosis
Traditional antipsychotics block the ____ receptor and clinical efficacy is directly proportional to affinity
D2
Postmortem, there has been found to be an ____ in dopamine receptor density in those with untreated schizophrenia
Increase
The clinical response of schizophrenia is correlated with a decrease in a dopamine metabolite, ____ ____, in the cerebrospinal fluid, plasma, and urine
Homovanillic acid
We know that serotonin is also involved with neurotransmitters because LSD, which produces hallucinations (like seen in schizophrenia), is a ___ ____
Serotonin agonist
We know that glutamate is involved in schizophrenia because PCP, which produces a psychosis similar to schizophrenia, is a ____ ___ at NMDA (glutamate) receptors
Glutamate antagonist
NMDA hypofunction causes glutamate ____ and the destruction of cortical neurons
Toxicity
Glutamate is like the “___ ___” in your car for neuronal transmission
Gas pedal
Traditional antipsychotics principally act via the blockage of ____ ____
Dopamine receptors
____ subtypes of dopamine receptors have been described
5
Antipsychotic activity of the classical agents correlates best with the ____ receptor blockade
DA2
Dopamine receptor blockade in the extrapyramidal tracts and the hypothalamus/pituitary account for many side effects of antipsychotics such as…
-Movement disorders
-Endocrine imbalances
Other side effects of traditional antipsychotics are related to interactions with other _____
Neurotransmitters
Atypical or second-generation antipsychotics block more than one type of _____
Receptor
Atypical/second-generation antipsychotics have a greater affinity for ____ than ____
Serotonin; dopamine
Atypical/second-generation antipsychotics can alleviate positive and negative symptoms and possibly help _____ deficits
Neurocognitive
Atypical or second-generation antipsychotics cause less or no ___ ___ or ___ ___
-Extrapyramidal symptoms
-Tardive dyskinesia
Atypical or second-generation antipsychotics can generally be started ____ in the disease
Earlier
In 2003, Ariprprazole (Abilify) was introduced as the ___ atypically antipsychotic
7th
Aripiprazole (Abilify) has unique synaptic actions, making it the first of a ___ generation of antipsychotic drugs
Third
Aripiprazole (Abilify) is not a dopamine antagonist, but rather a ___ ____ of dopamine receptors; it “stabilizes” hyper and hypoactivity
Partial agonist
Aripiprazole (Abilify) is also 5HT2 ____ and partial ____ at 5HT1A
Antagonist; agonist
Antipsychotics are absorbed ___, but incompletely
Readily
Antipsychotics are significantly affected by ___-___ metabolism
First-pass
Antipsychotics are ____% protein-bound
95
Antipsychotics have a much ____ clinical duration of action than estimated from the plasma half-life due to sequestration in fat tissue
Longer
Antipsychotics are mainly metabolized by ____ ____ and ____
Hepatic oxidation and glucoronidation
Active metabolite formation is not important except for with what drug, that produces a metabolite that is more potent than the parent drug?
Thioridazine
The ability to metabolize and eliminate antipsychotics diminishes with ____
Age
The typical half-life of an antipsychotic is from ___-___ hours
12-24
Smoking decreases plasma levels of what 4 antipsychotic drugs?
-Clozapine
-Olanzapine
-Haloperidol
-Fluphenazine
Antipsychotics are pure ____ blockers
D2
Chlorpromazine (Thorazine) should be given at a dose between ____-___ mg/day
200-1,000
Chlorpromazine (Thorazine) is rarely used due to its low ____
Potency
Chlorpromazine (Thorazine) causes significant central and peripheral alpha-1 adrenergic blockage, causing ___ and ____
Sedation and hypotension
Chlorpromazine (Thorazine) may cause some extrapyramidal symptoms due to ____ blockage in basal ganglia
Dopamine
Thioridazine (Mellaril) should be given at a dose between ____-____ mg/day
20-800
Thioridazine (Mellaril) has a greater potency than Aliphatics like _____, but causes a similar alpha-1 adrenergic blockage
Chlorpromazine
Thioridazine (Mallaril) causes less extrapyramidal symptoms due to significant ____ activity, but causes increased incidence of cardiac arrhythmias
Anticholinergic
Fluphenazine (Prolixin) should be given in doses of __-__ mg/day
5-40
Fluphenazine (Prolixin) is also available in ____ formulation
Intramuscular
Perphenazine (Trilafon) should be given in doses between ___-___ mg/day
8-64
Thiothixene (Navane) should be given in doses between ___-___ mg/day
6-60
Phenothiazines and Thioxanthenes cause potent ____ blockages, leading to significant extrapyramidal symptoms
D2 (dopamine)
Phenothiazines and Thioxanthenes cause less of an ____ adrenergic blockade, meaning less sedation and hypotension
Alpha-1
Haloperidol (Haldol) is an example of what drug class?
Butyrophenones
Haloperidol (Haldol) was the first alternative to ____
Phenothiazines
Haloperidol (Haldol) should be given in doses between ___-___ mg/day
5-40
Butyrophenones like Haloperidol (Haldol) are _____ unrelated to phenothiazines, though the pharmacological and side effects are similar
Structurally
Butyrophenones like Haloperidol (Haldol) cause high incidence of ____ ____ and ____, but less weight gain, anticholinergic effects, and hypotension than older phenothiazines
Extrapyramidal symptoms and sedation
What are three Phenothiazine alternatives of the 1970s?
-Molindone (Moban)
-Pimozide (Orap)
-Loxapine (Loxitane)
Molindone (Moban) and Pimozide (Orap) are ____ antagonists and are structurally unrelated to the phenothiazines/thioxanthenes; they have no apparent clinical advantages
D2 (dopamine)
Loxapine (Loxitane) has a similar structure to ____ ____
Tricyclic anitdepressants
Loxapine (Loxitane) has mixed ____ and ____ activity
Antipsychotic and antidepressant
What is a metabolite of Loxapine (Loxitane)?
Amoxapine
Loxapine (Loxitane) binds ____ and ____ receptors
Dopaminergic and serotonergic
Loxapine causes less ____ symptoms than piperazine phenothiazines
Extrapyramidal
Traditional antipsychotic agents have a ____ therapeutic index with respect to mortality
High
Overdoses with traditional antipsychotics are rarely fatal, except for ____ which can be cardiotoxic
Thioridazine
Side effects of traditional antipsychotic agents routinely occur at therapeutic doses as they are extensions of pharmacological actions; these include…
-Sedation
-Extrapyramidal symptoms (dystonia, akathisia, parkinsonism)
-Tardive Dyskinesia
Tardive Dyskinesia occurs in ___-___% of chronically treated patients
20-40
Tardive Dyskinesia causes abnormal, jerky movements of the ____ and ____
Face and tongue
The mechanism of tardive dyskinesia is poorly understood and unpredictable, but thought to be due to ___ ___ ____
D2 (dopamine) receptor supersensitivity
There is no treatment for tardive dyskinesia and it may be _____
Irreversible
If signs of tardive dyskinesia develop, reduce dose or discontinue the antipsychotic and eliminate all drugs with central anticholinergic action (antidepressants) OR switch to ___
Clozapine
Prevention of tardive dyskinesia is key; give minimal ____ doses for a limited time if possible
Effective