E1- Antidepressants Flashcards
What drugs are classified as TCAs?
Amitriptyline
Imipramine
Nortriptyline
Desipramine
What is the MOA of TCAs?
Inhibit reuptake of NE and 5-HT; also block alpha, histamine, and muscarinic receptors
What are the uses of TCAs?
Depression (2nd to last choice)
Chronic pain (TMJ) Fibromyalgia
Enuresis
What are the tertiary amine TCAs?
Amitriptyline
Imipramine
What are the secondary amine TCAs? (primarily block NE re-uptake)
Nortriptyline
Desipramine
Do tertiary or secondary amines produce more seizures and are more sedating?
Tertiary amines
How are TCAs metabolized?
What should you avoid?
CYP2D6 (do not take with Fluoxetine- inhibits 2D6)
What are SE of TCAs?
Weight gain Antihistamine effects Anticholinergic effects Alpha blocker effects Analgesia SIADH Sexual dysfunction Decreased seizure threshold
Are TCAs safe in pregnancy?
Yes
What is seen with TCA OD? How is it treated?
Torsades de pointes
Magnesium, isoproterenol, and cardiac pacing
What are TCA drug interactions?
Fluoxetine (inhibits metabolism) MAOIs (serotonin syndrome) SSRIs Amphetamines (HTN) Alcohol/CNS depressants (sedation) Anticholinergics
What drugs are classified as SSRIs?
Fluoxetine Sertraline Paroxetine Citalopram Escitalopram
What is the MOA of SSRIs?
Selectively inhibit the reuptake of 5-HT
What are the uses of SSRIs?
Depression Panic disorder Bulimia Alcoholism Obsessive-compulsive disorder & social anxiety = Paroxetine
What are SE of Fluoxetine?
Inhibits CYP2D6 (most drug interactions of SSRIs) Impairs blood glucose in diabetics
Which SSRI is least likely to cause drug interactions and preferred in the elderly?
Sertraline
What is DOC for depression?
Citalopram
What are SE of SSRIs?
Weight gain/loss
GI: nausea, loss of appetite, constipation
Anxiety/insomnia (Fluoxetine or Sertraline)
Sexual dysfunction
Photosensitivity
Because SSRIs inhibit CYP3A4 and 2D6, what drug interactions should you watch for?
TCAs
Phenytoin
Carbamazepine
What drug interactions of SSRIs can cause serotonin syndrome?
St. John’s Wort
Amphetamines
MAOIs
Meperidine (opioid)