Anti-Psychotics Flashcards
What is the main use of Antipsychotics?
Schizophrenia
What can antipsychotics also be used to manage?
Other forms of psychosis
Mania
Agitation
How are antipsychotics classified ?
Typical
Atypical
What is the main problem with typical antipsychotics?
Extrapyramidal side-effects
What is the mechanism of action of typical antipsychotics?
Dopamine D2 receptor antagonists
What do typical antipsychotics block?
Dopaminergic transmission in the mesolimbic pathways
What are the main 2 adverse effects of typical antipsychotics?
Hyperprolactinaemia
Extrapyramidal side effects
How can hyperprolactinaemia present in men?
How can hyperprolactinaemia present in women?
What are the 2 most common typical antipsychotics?
Haloperidol
Chlorpromazine
What is the mechanism of action of atypical antipsychotics?
Act on a variety of receptors (D2, D3, D4, 5-HT)
How are atypical antipsychotics classified?
Serotonin-dopamine 2 antagonists (SDAs)
Why are atypical antipsychotics classified as atypical?
They are atypical in the way they affect dopamine and serotonin neurotransmission in the four key dopamine pathways in the brain
What are the most common atypical antipsychotics?
Risperidone
Olanzapine
Clozapine
Aripiprazole
What is less common with atypical antipsychotics?
Extrapyramidal side-effects
Hyperprolactinaemia
What are the main type of adverse effects of atypical antipsychotics?
Metabolic effects
What does risperidone function like at higher doses?
A typical antipsychotic
What type of side effects does risperidone have?
Extrapyramidal and hyperprolactinaemia
Which atypical antipsychotic is good for elevated prolactin levels?
Aripiprazole
What are the main side effects of Olanzapine?
Weight gain
Dyslipidaemia (hyperlipidaemia)
In which patients would you not use olanzapine?
Overweight or obese
When should clozapine be used?
If a patient is resistant to other antipsychotic medication
What is the main risk of using clozapine?
Agranualocytosis
When is a patient classed as resistant?
After the sequential use of 2 or more antipsychotic drugs, each for 6-8 weeks
What are other side effects of clozapine?
Neutropenia
Myocarditis
Constipation
What is the main risk of using clozapine?
Agranulocytosis
When would you need to adjust the dose of clozapine?
If smoking is started or stopped during treatment
What is essential during the treatment with clozapine?
Full blood count monitoring
What should you do if someone on clozapine develops a fever?
Give IV broad spectrum antibiotics
What is there an increased risk of with antipsychotics in the elderly?
Increased risk of:
Stroke
Venous Thromboembolism
What are the main adverse effects of antipsychotics?
Tardive Dyskinesia (TD
Neuroleptic Malignant Syndrome (NMS)
Extrapyramidal side effects
What are examples of extrapyramidal side-effects?
Parkinsonism
Acute dystonia
Akathisia
Tardive dyskinesia
What is Neuroleptic Malignant Syndrome?
Characterised by: Severe muscle rigidity Fever Altered mental status Autonomic instability Elevated WBC, CPK and lfts. Potentially fatal.
What is acute dystonia?
Sustained muscle contraction
What is akathisia?
Severe restlessness
What is Tardive Dyskinesia?
Involuntary muscle movements that may not resolve with drug discontinuation
How often does a Full blood count (FBC), urea and electrolytes (U&E), liver function tests (LFT) need to be done on someone taking antipsychotics?
- at the start of therapy
- annually
- clozapine- more frequent FBC- initially weekly
How often do Lipids and weight need to be checked in someone taking antipsychotics?
- at the start of therapy
- at 3 months
- annually
How often does fasting glucose and prolactin need to be checked in someone taking antipsychotics?
- at the start of therapy
- at 6 months
- annually
How often does blood pressure need to be checked in someone taking antipsychotics?
- baseline
* frequently during dose titration
How often does an Electrocardiogram need to be done on someone taking antipsychotics?
- baseline
- Cardiovascular risk assessment
- Annually