18. Psychopharmacology Flashcards
“HAM” side effects
antiHistamine: sedation, weight gain
antiAdrenergic: hypotension
antiMuscarinic: dry mouth, blurred vision, urinary retention, constipation
What classes of drugs have HAM side effects?
TCAs
Low-potency antipsychotics
Serotonin syndrome classically occurs when which 2 classes of drugs are combined
MAOIs
SSRIs
When does a hypertensive crisis occur?
A buildup of stored catecholamines
Caused by the combination of MAOIs with tyramine-rich foods or with sympathomimetics
First line treatment for extrapyramidal symptoms causes by antipsychotics
Benztropine
3 categories of EPS
Parkinsonism: masklike face, cogwheel rigidity, bradykinesia, pill-rolling tremor
Akathisia: restlessness, need to move, agitation
Dystonia: sustained, painful contraction of muscles of neck, tongue, eyes, diaphragm
Hyperprolactinemia is caused by which drugs
Risperidone Typical (first) generation antipsychotics
Occurs after YEARS of antipsychotic use
Tardive dyskinesia
What is tardive dyskinesia
Choreoathetoid muscle movements: usually of mough and tongue
Usually irreversible
More likely to occur due to high-potency, first-generation antipsychotics
Symptoms of neuroleptic malignant syndrome
MENTAL STATUS CHANGES fever tachycardia hypertension tremor elevated CPK Lead pipe rigidity
*Can be caused by any antipsychotic after a short or long time
20 % mortality rate
Characteristics of acute dystonia
twisting and abnormal postures
Bradykinesia
decreased or slow body movement
Common side effect of anticholinergic meds
constipation
Anticholinergic meds exacerbate what type of disorders?
Neurocognitive
Dementias
Important CYP450 Inhibitors
Fluvoxamine Fluoxetine Paroxetine Duloxetine Sertraline
Over the counter cough suppressant that increases serotonin
Dextromethorphan
Location of serotonin pumps inhibited by SSRIs
Presynaptic
SSRI with longest t1/2
Fluoxetine (Prozac)
FDA blackbox warning for SSRIs
May increase suicidal thinking and behavior
*applies to children up to age 25, but may be accurate for adults as well
SSRI with higher risk for GI upset
Sertraline (Zoloft)
SSRI with short t1/2 leading to withdrawal phenomena if not taken consistently
Paroxetine (Paxil)
SSRI currently approved only for sue in OCD
Fluvoxamine (Luvox)
SSRI with dose dependent QTc prolongation
Citalopram (Celexa)
Enantiomer of citalopram, possibly fewer side effects, also has dose dependent QTc prolongation
Escitalopram (Lexapro)
What class of drugs that is used for headaches can cause serotonin syndrome when used with SSRIs?
Triptans
Used in fibromyalgia
Duloxetine
SNRI major uses
Depression
Neuropathic pain
SSRIs can increase the level of what drug?
Warfarin
Carries a blackbox warning for rare but serious liver failure
Nefazodone
Sedation
Weight gain
Used in treatment of major depression
Mirtazapine
MOA of TCAs
inhibit reuptake of NE and serotonin, increasing availability of monoamines in the synapse
Treatment for TCA overdose
Sodium bicarbonate
TCA: useful in chronic pain, migraines, insomnia
Amitriptyline
Useful in enuresis (2nd line)
Imipramine
TCA used in treatment of OCD
Clomipramine
Secondary amines (2) that are metabolites of tertiary amines so they are less anticholinergic, antihistaminic, and antiadrenergic
Nortriptyline
Desipramine
Tetracyclic antidepressant
Amoxapine
*metabolite of antipxychotic loxapine
Majof complications of TCAs
Cardiotoxicity
Convulsions
Coma
More effective in depression with atypical features: MAOIs or TCAs?
MAOIs
Highly protein bound and lipid soluble
TCAs
Transdermal MAOI patch that does not require patients to follow dietary restrictions
Selegiline
MAOIs reversible of irreversible?
Irreversible
The MAOIs
Phenelzine
Tranylcypromine
Isocarboxazid
When are MAOIs used?
Refractory depression
First step when suspecting serotonin syndrome
Next?
discontinue meds
Supportive care, benzodiazepines
*The serotonin antagonist cyproheptadine can also be used
Patients should supplement with what vitamin when taking MAOIs?
B6
Why do low potency typical antipsychotics require higher doses than high potency typicals?
Because they have lower affinity for the dopamine receptors
Commonly causes orthostatic HTN
Can cause blue-gray skin discoloration
can cause photosensitivity
Chlorpromazine
Retinitis pigmentosa association
Thioridazine
Low potency typicals
Chlorpromazine
Thioridazine
High potency typicals
Haloperidol
Fluphenazine
Trifluoperazine
Pimozide
Category with greater risk for EPS and TD
High potency typical antipsychotics
Positive symptoms of Schizophrenia pathway
mesolimbic
negative symptoms of schizophrenia pathway
mesocortical
Extrapyramidal symptoms occur through blockade of what pathway
DA in nigrostriatum
Most common presenting symptom of neuroleptic malignant syndrome
fever
category of antipsychotics more likely to lower seizure threshold
low-potency
There is a ____ % chance of developing tardive dyskinesia for each year treated with a typical antipsychotic
5
Atypical antipsychotics less associated with weight gain
Ziprasidone
Aripiprazole
Scale used to quantify and monitor tardive dyskinesia
AIMS: Abnormal involuntary movement scale
Hypersalivation
Clozapine
Myocarditis
Clozapine
Agranulocytosis
Clozapine
When must clozapine be stopped?
ANC below 1500/microliter
Only antipsychotic shown to decrease the risk of suicide
Clozapine
QTc prolongation
Must be taken with food
Ziprasidone
Elevated LFTs or ammonia may be present
2nd generation antipsychotics
Metabolic syndrome
2nd generation antipsychotics
Patients on Clozapine must have weekly blood draws for how long?
6 months
Only mood stable shown to decrease suicidality
Lithium
Drug of choice for acute mania
Lithium
Drug of choice as prophylaxis for both manic and depressive episodes in bipolar & schizoaffective disorders
Lithium
What is it important to monitor in patient taking Lithium?
Creatinine
Thyroid function tests
Blood levels coorelate with clinical efficacy
Lithium
Blood levels are used for what drugs
Lithium
Valproic acid
Carbamazapine
Clozapine
Factors that increase Lithium levels
NSAIDs Aspirin (may) Thiazides Dehydration Salt deprivation Sweating Impaired renal function
Good for rapid cycling bipolar disorder
Carbamazepine
Side effect of leukocytosis
Lithium
Induces its own metabolism (autoinduction)
Carbamazepine
Neural tube defects
Carbamazepine
Efficacious for bipolar depression but not acute mania
Lamotrigine
May be helpful with impulse control disorders
Side effect of weight loss
Side effect of cognitive slowing
Can cause metabolic acidosis, kidney stones
Topiramate
Long acting benzos
Diazepam (Valium)
Clonazepam (Klonopin)
Short acting benzos
Triazolam
Midazolam
Partial agonist at 5HT-1A
Buspirone
NMDA glutamate receptor antagonist
Memantine
Anticholinergics and antihistamines may cause _______
confusion/delirium
Corticosteroids may cause__________
depression
Antibiotic that may cause psychosis
Isoniazid
Most effective treatment for Major Depressive Disorder
ECT