Depression Flashcards
What conditions can people with depression suffer from?
People with depression suffer greatly with persistent feelings of hopelessness, dejection, constant worry, poor concentration, a lack of energy, an inability to sleep and, sometimes, suicidal tendencies
What neurotransmitters are believed to be involved in depression?
Serotonin (5-HT), Norepinephrine (NE), Epinephrine (Epi), dopamine (DA), glutamate and acetylcholine (ACh)
What key drugs can cause or worsen depression?
- ADHD medications: Atomoxetine (Strattera)
- Analgesics (Indomethacin)
- Antiretrovirals (NRTIs): Efavirenz (in Atripla), Rilpivirine (in Complera, Odefsey)
- Cardiovascular medications: beta-blockers (especially propranolol)
- Hormones: hormonal contraceptives, anabolic steroids
- Other: antidepressants, benzodiazepines, systemic steroids, interferons, varenicline, ethanol
What assessment is used to diagnosed depression?
Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5)
What is another example of a widely used depression assessment scale?
The Hamilton Depression Rating Scale where the patient rates their symptoms of depression on a numerical scale, and the total score indicates whether or not depression is present
Describe the DSM-5 Criteria
At least 5 of the following symptoms present during the same two week period (must include depressed mood or diminished interest/pleasure): Mood (depressed), Sleep (increased/decreased), Interest/pleasure (diminished), Guilt or feelings of worthlessness, Energy (decreased), Concentration (decreased), Appetite (increased/decreased), Psychomotor agitation or retardation, Suicidal ideation
*M SIG E CAPS
What is necessary to rule out prior to initiating antidepressant therapy?
It is necessary to rule out bipolar disorder prior to initiating antidepressant therapy to avoid inducing mania or cause rapid-cycling (cycling rapidly between bipolar depression and mania)
What should not be used when depression and anxiety occur together?
When depression and anxiety occur together, BZDs should not be used alone; they can worsen and/or mask depression and can be problematic in patients with concurrent substance abuse disorders
What natural products may be helpful for treating depression?
St. John’s Wort, SAMe (S-adenosyl-L-methionine), valerian, or 5-HTP (5-hydroxytryptophan) may be helpful for treating depression
What are some key drug interactions of natural products that may be helpful for depression?
St. John’s Wort, SAme and 5-HTP can increase the risk of serotonin syndrome and should not be used with other serotonergic agents. St. John’s Wort is a broad-spectrum CYP450 enzyme inducer with many significant drug interactions, and it can cause phototoxicity. Valerian can cause sedation
What needs to be assessed prior to and during drug treatment for depression?
Treatment of depression can require one or more trials of medication/s. If a drug does not work after a suitable trial of at least 4-8 weeks, treatment should be reassessed. A thorough patient history is critical; what worked in the past, or did not work, should help guide therapy
How should mild depression be treated?
Mild depression should be treated with psychotherapy (e.g. cognitive behavioral therapy)
How should moderate to severe depression be treated?
Moderate to severe depression should be treated with medication in addition to the option of psychotherapy. The effectiveness of the different antidepressant classes is generally comparable
What should the initial choice of pharmacotherapy be based on?
The initial choice of medication should be based on the side effect profile, safety concerns and patient-specific symptoms. For most patients an SSRI or SNRI is preferred or mirtazapine or bupropion
What should be done if a woman is on antidepressants and wishes to become pregnant?
It may be possible to taper the drug if the depression is mild and she has been symptom-free for the previous six months. In more severe cases, medications may need to be continued
What do the ACOG guidelines recommend for mild depression in pregnancy?
The ACOG guidelines for mild depression in pregnancy recommend psychotherapy first, followed by drug treatment if needed
What is the concern of the initiation of drug treatment in pregnancy?
The risks of adverse outcomes for both the mother and the unborn baby so the risk versus benefit must be considered individually
What drug treatment is often used initially in depression and pregnancy?
SSRIs are often used initially, with the exception of paroxetine, due to potential cardiac effects
What is the risk of use of SSRIs in pregnancy?
There is a warning regarding SSRI use during pregnancy and the potential risk of persistent pulmonary hypertension of the newborn (PPHN)
What are some recommendations of treatment for postpartum depression?
Breastfeeding helps for physical and emotional symptoms, and is considered beneficial for the baby. Drug safety when breastfeeding is essential. SSRIs or tricyclics are generally preferred (with the exception of doxepin). Brexanolone (Zulresso), a C-IV drug, is FDA-approved for postpartum depression. It is given as a continuous IV infusion over 60 hours and can cause excessive sedation
What population is the use of oral nonselective monoamine oxidase inhibitors limited to?
Due to safety concerns, the use of oral nonselective monoamine oxidase inhibitors, such as phenelzine, tranylcypromine and iocarboxazid is restricted to patients unresponsive to other treatments
What is a safety concern of the use of one or more serotonergic medications?
Since many antidepressants increase serotonin levels, serotonin syndrome can occur with the administration of one or more serotonergic medications. The risk is most severe when a MAO inhibitor is administered with another serotonergic medication
What are some symptoms of serotonin syndrome?
Severe nausea, dizziness, headache, diarrhea, agitation, tachycardia, hallucinations or muscle rigidity
What should be done if an antidepressant is being discontinued?
If an antidepressant is being discontinued, it should generally be tapered over several weeks to avoid withdrawal
What are some withdrawal symptoms?
Withdrawal symptoms include anxiety, agitation, insomnia, dizziness and flu-like symptoms
What mediations carry a higher risk of withdrawal symtpoms?
Paroxetine and venlafaxine carry a higher risk of withdrawal symptoms and must be tapered upon discontinuation
What is an exception to the tapering rule?
An exception to this rule is fluoxetine, which self-tapers because of its long half-life
What are some counseling points of discontinuing an antidepressant?
Pharmacists must counsel patients on the risk of withdrawal symptoms and to not discontinue treatment without discussing with their healthcare provider
What is the boxed warning associated with all antidepressants?
All antidepressants carry a boxed warning of a possible increase in suicidal thoughts or actions in some children, teenagers or young adults within the first few months of treatment or when the dose is changed
*MedGuides are required for all antidepressants
How long does it take for antidepressant medications to work?
Antidepressant medication must be used daily, and will take time to work. Physical symptoms such as low energy improve within 1-2 weeks but psychological symptoms, such as low mood, may take a month or longer
What do physicians and pharmacist need to educate with regards to suicide prevention?
Physicians and pharmacists must educate patients, family and caregivers about the risk of suicidality and screen for suicide risk. If a patient reports suicidal ideation, refer the patient to the ED, the suicide hotline or elsewhere for help. If someone has a plan to commit suicide, it is more likely that the threat is immediate
What is the MOA of selective serotonin reuptake inhibitors (SSRIs)?
SSRIs increase 5-HT by inhibiting its reuptake in the neuronal synapse. They weakly affect NE and DA
What are some examples of SSRIs?
Citalopram (Celexa), Escitalopram (Lexapro), Fluoxetine (Prozac), Paroxetine (Paxil), Sertraline (Zoloft), Fluvoxamine IR/ER
What are some contraindications of SSRIs?
Do not use with MAO inhibitors, linezolid, IV methylene blue or pimozide
What is a contraindication specific to Fluoxetine and Paroxetine?
Do not use with Thioridazine
What is a contraindication specific to Fluvoxamine?
Do not use with Alosetron, Thioridazine or Tizanidine
What is a contraindication specific to Sertraline solution?
Do not use with Disulfiram
What is a contraindication specific to Brisdelle?
Pregnancy
What are some warnings associated with SSRIs?
- QT prolongation: do not exceed citalopram 20 mg/day in elderly (> 60 years), liver disease, with CYP2C19 poor metabolizers or on 2C19 inhibitors; do not exceed escitalopram 10 mg/day in elderly
- SIADH/hyponatremia, fall risk
- Bleeding
What are some side effects associated with SSRIs?
- Sexual side effects: decreased libido, ejaculation difficulties, anorgasmia, erectile dysfunction
- Somnolence, insomnia, nausea, dry mouth, diaphoresis (dose-related), weakness, tremor, dizziness, headache
- Osteopenia/osteoporosis, restless drug syndrome (assess whether the onset coincided with initiation of treatment)
Which SSRI is the most activating?
Fluoxetine (take dose in AM)
Which SSRI is most sedating?
Paroxetine, Fluvoxamine (take dose in PM)
When should other SSRIs be taken?
Take dose in the AM; if causing sedation, take in the PM
What are some notes regarding SSRIs?
- All approved for depression and a variety of anxiety disorders, except Fluvoxamine (only approved for OCD)
- All available in solution except Fluvoxamine
- Sertraline is preferred in patients with cardiac risk
- To switch to fluoxetine delayed release 90 mg/weekly from fluoxetine 20 mg daily, start 7 days after last daily dose
Describe the drug interaction of SSRIs and MAO inhibitors
Can cause serotonin syndrome or hypertensive crisis:
- Allow a two-week washout between MAO inhibitors and SSRIs. Fluoxetine is the exception; due to its long half life, a five-week washout period is required if switching from fluoxetine
- Do not initiate in patients receiving linezolid or IV methylene blue due to risk of serotonin syndrome
Which SSRIs have drug interactions with QT prolonging drugs?
QT prolongation most consistently noted with citalopram and escitalopram. Additive QT prolongation risk with SSRIs and other QT-prolonging drugs
What medications used concomitantly with SSRIs can increase bleeding risk?
Increased bleeding risk when used with anticoagulants, antiplatelets, NSAIDs, select natural products (e.g. gingko, garlic, ginger, ginseng, glucosamine, fish oils), thrombolytics
Which SSRIs are CYP2D6 inhibitors and how does it effect doses of other medications?
Fluoxetine, Paroxetine and Fluvoxamine
- Tamoxifen requires conversion to its active form by CYP2D6. Decreased tamoxifen effectiveness occurs with fluoxetine and paroxetine. Venlafaxine is preferred in combination with tamoxifen
- Some antipsychotic drugs are CYP2D6 substrates and may need a lower dose when given in combination with fluoxetine and paroxetine
What medications should not be used with SSRIs?
Do not use with thioridazine, pimozide or cimetidine
What medications should be used with caution with SSRIs?
Caution with drugs that cause orthostasis or CNS depression due to risks of falls
What is an example of an SSRI and 5-HT1A partial agonist?
Vilazodone (Viibryd)
What is an example of an SSRI, 5-HT3 receptor antagonist and 5-HT1A agonist?
Vortioxetine (Trintellix)
What are some contraindications of SSRI combination products?
Do not use within 14 days of MAO inhibitors; do not use with linezolid or IV methylene blue