Psychology Pharm Flashcards
What is the MOA of Benzodiazepines
GABA-A allosteric site agonists (increasing Chloride channel opening frequency) leading to CNS depression
What drug is used in the treatment of Benzodiazepine overdose
Flumazenil, competitive GABA-A antagonist (inhibitor)
How to differentiate between Benzo and Opioid overdose (physical sign)
Opioid overdose presents with pupillary constriction (miosis).
What benzodiazepines are used to treat EtOH withdraw
Long acting Benzo: Diazepam (Valium) and Chlordiazepoxide. Both have long acting active metabolites created in the liver.
What is the treatment for EtOH withdraw in a patient with Liver Disease
Short Acting Benzo: Lorazepam IV (Ativan)
IV Benzodiazepines used for Tx of status epilepticus
Diazepam (Valium) or Lorazepam (Ativan)
What is the MOA of SSRI
Inhibit Serotonin 5-HT transporter, inhibiting re-uptake of serotonin and Increasing serotonin concentration at the synapse.
What SSRI has long acting metabolites, and therefore doesn’t cause discontinuation syndrome
Fluoxetine (Prozac)
What SSRI is contraindicated in pregnancy
Paroxitine (Paxil)
What SSRI is recommended in pregnancy
Sertraline (Zoloft)
SSRIs approved for treatment of OCD
Fluvoxamine (Luvox), Sertraline (Zoloft), Fluoxetine (Prozac)
What is the most serious adverse effect of SSRI
SIADH: Increased ADH secretion leading to Increased water retention resulting in Hyponatremia (Hypoosmolar serum) and Hyperosmolar urine)
What is the normal range for urine specific gravity
(hypoosmolar)1.005 to 1.030 (hyperosmolar)
“If its high, you’re dry!”
What is the differentiating physical sign seen in Serotonin Syndrome compared to Neuroleptic Malignant Syndrome (NMS)
Hyperreflexia (ankle clonus)
What is the treatment for Serotonin Syndrome
1st line: Diazepam (Valium) or Lorazepam (Ativan) to reduce agitation and stabilize vital signs.
2nd line: Cyproheptadine (5HT-2 Antagonist)
What is the MOA for SNRI
Inhibit pre-synaptic reuptake of Norepinephrine & Serotonin (monoamines)
What SNRI is use for the treatment of Fibromyalgia and Osteoarthritis
Duloxetine (Cymbalta)
Which antidepressant can cause hypertension
SNRI: Venlafaxine (Efexor)
MOA of Bupropion (Welbutrin)
Weak NDRI: Norepinephrine and Dopamine reuptake inhibitor (blocks NET/DAT transporters)
Contraindications for Bupropion (Wellbutrin) use
Hx of seizure, Hx of eating disorder, Hx of EtOH abuse, Conditions leading to electrolyte imbalance.
MOA of Mirtazapine (Remeron)
alpha2 antagonist (Increased Secretion of
Norepinephrine)
MOA of Trazodone (Molipaxin)
Serotonin Modulator: SSRI activity + various serotonin receptor binding.
What are the MAOIs and what do they increase
Isocarboxazid
Phenelzine
Tranylcypromine
Increase catecholamine and dopamine levels
What are the TCAs
secondary amines: better tolerated
Nortriptyline
Desipramine
tertiary amines:
Amitryptyline
Imipramine
MOA of tricyclic antidepressants
Serotonin & Norepinephrine reuptake inhibition. Anti-H1, A1, Muscarinic blockade (Anti-HAM)
Selegiline MOA
MAO-B Inhibitor, leading to Increased levels of Dopamine.
What are the C’s of TCA Toxicity
Convulsions Seizure
Coma
Cardiotoxicity
Anti-Cholinergic side effects
Method of Lithium reabsorption in the kidney
Mostly resorbed in the PCT via sodium channels.
Reabsorption into the Collecting Duct Principal Cells by the ENAC channel leads to Lithium accumulation in the principal cells and reduces or desensitizes the kidney’s ability to respond to ADH, leading to Diabetes Insipidus (unable to resorb water) leading to Hyperosmolar serum and Hypoosmolar (dilute) urine. *Urine Specific Gravity will be <1.005
Adverse effects of the mood stabilizer Valproate (Depakote)
Teratogen (Spina bifida)
Pancreatitis
High Aminotransferases (Liver)
Low Platelets (Thrombocytopenia)
*Agranulocytosis (a more severe neutropenia)
Low Neutrophils (ANC) in <100 cells per microlitre.
What are the Mood Stabilizers used to treat Bipolar Disorder I
1st Line:
Lithium
Valproate (Depakote)
2nd Line:
Quetiapine (Atypical)
Lamotrigine depressive type (Inactivates Na+ channels)
3rd Line:
Carbamazepine ( binds to Na+ channels in extend inactivated phase, blocking sustained high frequency neuron firing ) (reduces release of glutamate)
Treatment of ACTUE MANIA
Lithium or Valproate + Quetiapine
What are the HIGH potency antipsychotics
Haloperidol (TdP, EKG for QT interval)
Fluphenazine
Trifluoperazine
What are the LOW potency antipsychotics
Chlorpromazine (Cornea/skin deposits, Cholestatic Jaundice)
Thioridazine (retina deposits)
What antipsychotic is the most effective, and has least EPS
Clozapine
This drug is a last resort and required failure of 2 or more antipsychotic trials.
Requires regular monitoring of ANC due to
*Agranulocytosis (a more severe neutropenia)
Low Neutrophils (ANC) in <100 cells per microlitre.
DOC for Anorexia Nervosa
Olanzapine
DOC for Escalating Agitation in Acute Mania
IM injection of Olanzapine
Atypical with the most EPS
Risperidone
Atypical with QT elongation
Ziprasidone