Psychopharmacology 2 Flashcards
1
Q
SNRI Mechanism of Action (3)
A
- Prevents serotonin and norepinephrine from being taken back into the pre‐synaptic cell
- More serotonin and norepinephrine stays in the synaptic cleft
- More serotonin and norepinephrine binds to post‐synaptic receptors
2
Q
SNRI Duloxetine (Cymbalta) (4)
A
- Serotonin and norepinephrine reuptake inhibitor
- Multicenter study with 7‐17 year olds with GAD
- Followed for 10 weeks
- Significant improvement
3
Q
Selective Serotonin Reuptake Inhibitors (5)
A
- May take several weeks to see full effect – Titrate slowly (every 2‐3 weeks)
- If one medication does not work when titrated to maximum dose, switch to another medication
- Use associated with increased risk of suicide
- Especially in adolescent age group
- CAUTION with heart rhythm abnormalities
4
Q
SSRI Adverse Effects (13)
A
CNS
- Agitation
- Insomnia
- Sedation
- Tremor
- Apathy
- Headache
GI
- Weight gain or weight loss
- Appetite changes
- Nausea
- Diarrhea
- Stomach upset
- Dose related anorgasmia (Sexual dysfunction)
- Serotonin syndrome
5
Q
SSRI Side Effect Profile Expanded (4)
A
- Uncommon side effects include: Increased risk of bleeding, serotonin syndrome, abnormal heart rhythm
- Hyponatremia
- Suicidal ideations
- Rate of suicide is lower in countries where there is an increased use of SSRI
6
Q
Side Effects of SSRI: Serotonin Syndrome Clinical Presentation (9)
A
- Tachycardia
- Tremors
- Agitation, restlessness, confusion, disorientation – Fever
- Hypertension and hemodynamic instability – Salivation
- Loss of coordination
- Twitching of muscles, ataxia,
- Nausea, vomiting and diarrhea.
- Can mimic the presentation of influenza type illness
- Can occur due to patient taking herbal medication with SSRI
7
Q
Serotonin Syndrome Concerns (4)
A
- Induction of hypomaniac or manic episode if used in pediatric patients with bipolar disorder
- Signs of withdrawal can occur SSRIs are abruptly discontinued or taken inconsistently.
- Symptoms can include nausea and vomiting, dizziness, vertigo, sleep disruption, flu‐like symptoms or sensory disturbances such as paresthesias.
- Fewer withdrawal symptoms with fluoxetine.
8
Q
Serotonin Syndrome: Increased Risk (6)
A
- Increased risk when a medication is introduced, when a dose is increased, or when a second agent known to potentiate serotonin release is added to the drug regime
- Drugs that have an additive effect includes: – Triptans
- Opioid analgesics, central nervous system depressants Linezolid and macrolide antibiotics
- Vitamin E, omega‐3acidethylesters
- Alcohol
- Herbal preparations including St. John’s Wort – Run your drug programs!
9
Q
Serotonin syndrome: treatment (4)
A
- Benzodiazepines such as Diazepam (Valium) or Lorazepam (Ativan) to decrease agitation, seizure‐like movements, and muscle stiffness
- Cyproheptadine (Periactin), a drug that blocks serotonin production
- Fluids by IV
- Withdrawal of medicines that caused the syndrome
10
Q
Serotonin Syndrome: Response to Tx (10)
A
Acute phase
- Look for response and some remission
- Partial response after six weeks – Assess compliance
- Consider dose increase
Maintenance
- 4 to 12 months; Generally a year
- If stable then wean off
Discontinuation
- Possible if no previous history of depression and stable for 9 to 12 months
- Low stress time for weaning
- 25% decrease in week long intervals
- If previous depressive episode, wait full year
- If more than one episode, high risk of recurrence
11
Q
Management of SSRI Side Effects (9)
A
- Antidepressants
- Cardiotoxicity of Citalopram
- Mechanism is due to metabolite didesmethylcitalopram causing inhibition of K+ and Ca2++ channel
- Changes in QTc interval fluoxetine, sertraline, paroxetine, bupropion, venlafaxine
- Patients with long QT syndrome, heart failure, brayarrhythmias or predisposition to hypomagnesemia or hypokalemia need ECG if treated with citalopram
- Suicidality
- Third leading cause of death in youth – Evaluate for suicide using a tool
- Common somatic side effect
- Headache, GI distress, nausea, and weight gain
12
Q
What is the best treatment for adolescent depression? (4)
A
- Discussion of the underlying conflict of the depression
- SSRI only
- Referral to a therapist trained in cognitive behavioral therapy
- SSRI with cognitive behavioral therapy*
13
Q
PTSD Tx (4)
A
- No medication has FDA approval
- Propanolol
- No controlled studies
- Dearth of data on PTSD
14
Q
Antihistamines: MOA (2), Agents (3)
A
Mechanism of Action
- Competes with histamine on H1‐receptors
- Adverse event: sedation
Agents
1. Diphenhydramine (Benadryl): PO or IV (onset 30-60 min, duration 5-10 hours)
- Hydoxyzine (Vistaril): PO/IM (onset 15-30 min, duration 6-12 hours)
- Promethazine (Phenergan) – DO NOT USE IT!
15
Q
Antihistamines ADEs (9)
A
- Sedation
- Dry mouth
- Blurred vision
- Hang‐over effect
- Mechanism of Action for anxiety is actually via the adverse effect of sedation
- Hydroxyzine has FDA approved anxiety treatment in children
- Diphenhydramine is not
- Promethazine only approved in children > 2 year old but not be used due dystonia – Favorable side effect profile
- Associated drowsiness may make it difficult to tolerate antihistamines in social situations