Psych Drugs Flashcards
Typical antipsychotics
Dopamine-2 receptor antagonists
Atypical antipsychotics
Serotonin-dopamine antagonists
D2 partial agonists
Indications of typicals
Psychotic disorders Mood disorders Dementia Psychosis secondary to medical conditions, medications, and drugs of abuse Personality disorder Obsessive-compulsive disorder Autism Tourette’s disorder
dopamine-mediated effects: nigrostriatal pathway
EPS (Parkinsonism, Akathisia, Dystonic reactions, Tardive dyskinesia, NMS)
dopamine-mediated effects: mesolimbic pathway
dysphoria
dopamine-mediated effects: mesocortical pathway
worsening negative and cognitive symptoms
dopamine-mediated effects: tuberoinfundibular pathway
Hyperprolactinemia, and resultant galactorrhea, amenorrhea, sexual dysfunction
acute EPS
Dystonia – usually within hours
Akathisia – usually within days
Parkinsonism – usually within days to weeks
chronic/late set EPS
Tardive Dyskinesia usually after 3 months
treatment of dystonia (EPS)
Anticholinergics – injectable if needed
treatment of akathisia
beta blockers, anticholinergics
treatment of parkinsonism
anticholinergics, amantadine
Dopamine does what to ACh
suppresses
Dopamine blockade ___ ACh
increases
EPS caused by
decreased dopamine and increased ACh
improvement of EPS by
anticholinergics
mechanism of tardive dyskinesia
blockade of receptors in nigrostriatal dopamine pathway causes up-regulation, increased ACh
increased risk of TD w/
age > 50
dose
total exposure
mood disorder
anticholinergic side effects (M1)
constipation, blurred vision, dry mouth, drowsiness
antihistaminergic side effects (H1)
weight gain, drowsiness
anti-alpha adrenergic side effects
dizziness, decreased BP, drowsiness
neuroleptic malignant syndrome
life-threatening condition of
hyperpyrexia, autonomic instability, muscle rigidity, and delirium
Death occurs secondary to arrhythmia, rhabdomyolysis or respiratory failure
Discontinue the antipsychotic, aggressive hydration
Mortality rate of 20-30%
how to increase compliance
depot preparations
why was clozapine originally withdrawn
agranulocytosis
benefits of clozapine
Much lower incidence of extrapyramidal symptoms and tardive dyskinesia
Improves negative and cognitive symptoms
indications of clozapine
Treatment resistant schizophrenia
Schizophrenia with tardive dyskinesia
Schizophrenia or schizoaffective disorder with recurrent suicidal behavior
agranulocytosis
Life-threatening drop in white blood count
Contraindicated with pre-existing blood disorder
Estimated at 1-2%, about 0.38% with monitoring
Requires continuous monitoring
adverse effects of atypicals
Sedation
Anticholinergic side effects, including dry mouth, constipation, blurry vision, urinary retention, confusion, ECG changes
Myocarditis
Orthostatic hypotension
Weight gain, which can be substantial
Hypersalivation
Seizures, especially with high doses or fast titrations
Metabolic problems, including diabetes and hyperlipidemias
benefits of atypicals
Cause fewer EPS, little-to-no TD
Improve positive symptoms
Improve negative and cognitive symptoms
blocking 5HT2A receptor
disinhibits DA release and reduces D2 blockade
indications of atypical anatipsychotics
Psychotic disorders Mood disorders ? Dementia Psychosis secondary to medical conditions, medications, and drugs of abuse Personality disorder Obsessive-compulsive disorder Autism Tourette’s disorder **Mania
atypical agents
- pine
- zine
- done (risperidone)
aripiprazole
D2 partial agonist
metabolic side effects of atypicals
weight gain hyperlipidemia hyperglycemia diabetes ketoacidosis
metabolic syndrome (Syndrome X)
central obesity
high PB high triglycerides
low HDL-cholesterol
insulin resistance
CATIE trial
atypicals vs. perphenazine.
found to be equally effective
olanzapine more efficacious but worst for weight gain
mania symptoms
Inflated self-esteem or grandiosity
Decreased need for sleep
More talkative than usual or pressure to keep talking
Flight of ideas or subjective experience that thoughts are racing
Attention is easily drawn to unimportant or irrelevant items
Increase in goal-directed activity (either socially, at work or school, or sexually) or psychomotor agitation
Excessive involvement in pleasurable activities that have a high potential for painful consequences (e.g., engaging in unrestrained buying sprees, sexual indiscretions, or foolish business investments)
depression symptoms
Depressed mood most of the day, nearly every day,
Markedly diminished interest or pleasure in all, or almost all, activities most of the day
Significant weight loss when not dieting or weight gain or decrease or increase in appetite
Insomnia or hypersomnia
Psychomotor agitation or retardation
Fatigue or loss of energy
Feelings of worthlessness or excessive or inappropriate guilt
Diminished ability to think or concentrate, or indecisiveness
Recurrent thoughts of death, recurrent suicidal ideation without a specific plan, or a suicide attempt or a specific plan for committing suicide
Definition of Mood stabilizer
efficacy in at least one of the three phases of bipolar disorder (acute mania, acute depression, or prophylaxis), AND it should not cause affective switch to the opposite mood state nor should it worsen the acute episode.
Indications for mood stabilizers
Bipolar Disorder: Mania/Hypomania, Depression, Prophylaxis, Cyclothymia Depression Augmentation Schizoaffective Disorders Borderline Personality Disorder Intermittent Explosive Disorder Post-Traumatic Stress Disorder Neuropathic Pain Alcohol Detoxification Refractory Schizophrenia
Lithium formulations
Li2CO3
LiCl
LiCitrate
Lithium mechanism
Thought to involve modulation of second messenger systems, particularly in phosphatidyl inositol system
Alteration of G proteins, signal tranduction
Alteration downstream enzymes
Regulation of gene expression
Lithium first-line indications
Classic euphoric mania
Pure bipolar depression
Bipolar maintenance
Lithium second-line indications
Mixed mania
Rapid cycling
Lithium adverse effects
GI abdominal cramps, nausea, vomiting, diarrhea Neurologic cognitive dulling, decreased creativity tremor decreased memory and concentration Metabolic weight gain increased thirst and urination Dermatologic Psoriasis, acne Benign leukocytosis
Lithium: medically serious side effects
Hypothyroidism Renal polyuria and polydipsia (nephrogenic diabetes insipidus Nephrotoxicity (long-term) Cardiac arrhythmias Teratogenicity: Ebstein’s anomaly Overdose
Lithium therapeutic levels
0.8-1.2 mEq/L
Lithium Toxicity
1.5 + mEq/L
lithium management issues
requires blood monitoring
significant drug-drug interactions
lithium interactions
NSAIDs
Thiazide diuretics
ACE Inhibitors
Calcium channel blockers