Psychiatry - Pharm Flashcards
Major categories of antidepressants
How often does it work?
Abuse? Mood changes?
Tricyclic antidepressants (TCAs)
Monoamine oxidase inhibitors (MAOIs)
Selective serotonin reuptake inhibitors (SSRIs)
Atypical antidepressants
About 70% of patients with major depression will respond to antidepressant medication.
Antidepressants have no abuse potential and do not elevate mood.
Tx OCD
Behavioral tx + Meds
- Exposure and response prevention (ERP)
SSRIs (need higher doses than in depression)
- fluvoxamine**
TCAs
- Clomipramine
Can use amitriptyline if have corresponding pain sydnrome
ECT is last resort
Tx Panic disorder
- SSRIs: paroxetine, sertraline
- –> need 2-4 weeks for effective, need higher doses than for depression
- imipramine
- TCAs, benzos, MAOIs
Tx should last for 8-12 mo at least as relapse common
Tx Dysthymia
SSRI
Tx social phobia
CBT or SSRI/SNRI (paroxetine) if generalized (frequent) form
Benzo or beta blocker if infrequent occurrence
Tx PTSD
SSRIs - help decrease numbing sx
TCA (imipraine, doxepin)
MAOI
Prazosin for nightmares
CBT, support groups, eye mvmt desensitization
AVOID addictive meds (eg benzos) because of high rate of substance abuse in these pts
Tx IBS
SSRI
TCA
Tx Enuresis
TCA –> imipramine
Tx neuropathic pain
TCA
- amitriptyline
- nortriptyline
duloxetine
Tx migraine HA
TCA
SSRI
Bupropion
Tx smoking cessation
Bupropion
Tx autism
SSRI
Tx Pmenstrual dysphoric disorder
SSRI
Tx Depressive phase of manic depression
SSRI
Bupropion
Tx insominia
Mirtazapine
TCA
1st line for primary insomnia = benzos!
Tricyclic Antidepressant MoA
Names?
—| reuptake of norepi + serotonin
Names (Didnt AC): Doxepin Imipramine Desipramine Nortriptyline Triamipramine
Amitriptyline
Clomipramine
TCA least likely to cause orthostatic hypotension
Nortriptyline (secondary amine)
TCA least sedating
Desipramine (secondary amine)
TCA least anticholinergic effects
Desipramine
Hallmark of TCA toxicity
Widened QRS (>100msec)
Used as thershold to tx
Tx TCA overdose
IV sodium bicarbonate
TCA side effects
Anti-HAM (histamine, adrenergic, muscarinic)
Anti histamine:
- Sedation
Anti-adrenergic:
- Orthostatic hypotension
- tachycardia
- arrhythmias
Anti-muscarinic:
- Dry mouth
- constipation
- urinary retention
- blurred vision
- tachy
- Wt gain
Major complications: 3 C’s
- convulsions
- coma
- cardiotoxicity
Monoamine Oxidase Inhibitor MoA
Names?
Prevent inactivation of biogenic amines such as norepinephrine, serotonin, dopamine, and tyramine by inhibiting MAOI
Irreversible MAO-A and MAO-B inhibition
Names (PIT):
Phenelzine
Isocarboxazid
Tranylcypromine
MAO-A preferentially deactivates
Serotonin
MAO-B preferentially deactivates
Norepinephine
Epinephrine
What is MAOI very useful for?
Certain types of refractory depression + refractory panic d/o
Atypical depression
MAOI side effects
Orthostatic hypotension (#1) Drowsiness Wt gain Sex dysfunction Dry mouth Sleep dysfunction
Serotonin syndrome
Hypertensive crisis
How does serotonin syndrome happen?
Sx?
How to avoid?
How to tx?
SSRI + MAOI taken together
Sx: Autonomic instability Hyperthermia Seizures Myoclonic jerks
Can progress to: Hyperthermia Hypertonicity Rhabdo Renal failure Convulsions Coma Death
Avoid: wait 2 weeks before switching from SSRI to MAOI
Tx: d/c meds
Hypertensive crisis happens…
MAOI + tyramine-rich foods or sympathomimetics
Don’t have to follow diet restrictions with selegiline patch if low doses but serotonergic drugs must still be avoided
Foods w/ tyramine: Red chianti wine Cheese chicken liver fava beans cured meats
Sympathomimetics in OTC cold meds! be careful!
Selective serotonin reuptake inhibitors (SSRIs) MoA
Names
—| PREsynaptic serotonin pumps
Names: FLashbacks PARalyze SEnior CITezens ESCargo Fluoxetine, Fluvoxamine Paroxetine Sertraline Citalopram Escitalopram
SSRI w/ Longest 1/2 life w/ active metabolites
Fluoxetine
- don’t need to taper
SSRI w/ highest risk GI distrubances
Sertraline
SSRI most serotonin specific, most activating
Paroxetine
Only SSRI for OCD
Fluvoxamine
SSRI Side effects
Sex dysfunction GI disturbances Insomnia HA Anorexia, wt loss
Serotonin syndrome w/ MAOIs
SNRI
- names
- uses
Venlafaxine
- depression
- GAD
- ADHD
Duloxetine
- Depression
- neuropathic pain
S/E SNRI
Like SSRI
Increase BP
Bupropion uses
Smoking cessation
Seasonal affective disorder
ADHD
Bupropion S/E
LACK sexual SE
Dopaminergic effect in higher doses can exacerbate psychosis
Lower seizure threshold
NOT OK for:
lots of anxiety
seizure d/o
active eating d/o (b/c electrolyte disturbances make you at risk for seizures)
Trazadone uses
refractory major depression
major depression w/ anxiety
insomnia
Trazadone S/E
Nausea dizziness orthostatic hypotension cardiac arrhythmias SEDATION PRIAPISM
Black box warning - rare but serious liver failure
Mirtazapine
- mech
- uses
a2 presynaptic neuron antagonist
5-HT2 and 5-HT3 receptor blocker
H1 receptor blocker
Tx refractory major depression, esp if need wt gain
Mirtazapine Side effects
Sedation Wt gain Dizziness Somnolence Tremor Agranulocytosis
It becomes less sedative as you increase dose! This is because it increases Norepi uptake with higher doses
Difference between typical and atypical antipsychoatics
typical = block dopamine receptors
atypical = blcok dopamine and serotonin receptors
Low potency typical antipsychotics
Lower affinity for dopamine receptors - need higher dose
Mostly antagonize D2 receptors
Have higher incidence of antiCh and antihistamine S/E than high potency
Lower incidencey extrapyramidal s/e
Chlorpromazine (tx intractable hiccups; SE: orthostatic hypotension, skin discoloration (blue), photosensitivity)
Thioridazine
High potency typical antipsychotics
Greater affinity for D receptors - lower dose needed
Mostly antagonize D2 receptors
Higher incidence EPSE and neuroleptic malignant syndrome
Lower incidence antiCh and antihistamine s/e (orthostatic hypotension, sedation)
Better for negative symptoms of psychosis (eg flattened affect, social W/D)
Trifluoperazine Fluphenazine Haloperidol Perphenazine Pimozide (cardiac effects)
Typical antipsychoatics S/E
1) Anti-dopamine effects
- Extrapyramidal s/e (blepharospasm, opisthotomos, torticolis)
- happens within days of starting meds; can be life threatening
- Parkinsonism (mask-face, cogwheel rigidity, pill rolling tremor)
- Akathisia (restlessness)
- Dystonia
- hyperprolactinemia (decreased libido, impotence)
- -> usually with typicals and risperidone
2) Anti-HAM (histamine, adrenergic, muscarinic) effects
- sedation
- orthostatic hypoTN, cardiac abnormalities, sex dysfunction
- dry mouth, tachy, urinary retention, blurry vision, constipation
- wt gain
- HIGH LIVER enzymes —> jaundice
- Ophtho issues –> retinal pigmentation w/ Thioridazine, lens + corneal deposits w/ chlorpromazine
- Skin issues –> rash, blue-gray skin color w/ chlorpromazine
- Sizures
- Tardive dyskinesia (have to use > 6 mo)
- Neuroleptic malignant syndrome
Reason for tardive dyskinesia
Increase # of dopamine receptors causing lower levels of ACH
Choreathetoid muscle mvms, usually of mouth and tongue
After YEARS of antipsychotic use (> 6 mo)
Neuroleptic malignant syndrome
FALTERED
Fever Autonomic instability (tachy, labile HTN, diaphoresis) Leukocytosis Tremor Elevated CPK Rigidity (lead pipe) Excessive sweating Delirium
This is a med emergency! 20% mortality
Tx:
- d/c meds,
- supportive care;
- dantrolene, bromocriptine, amantadine
This is not allergic reaction and is not prevented from restarting same neuroleptic at later time
Atypical antipsychotics
- MoA
- names
Antagonize serotonin (5-HT2) and dopamine receptors
Aripiprazole is PARTIAL D2 agonist
Should take meds for 4 weeks before efficacy determined
Clozapine Risperidone Quetiapine Olanzapine Ziprasidone
Atypical antipsychotics s/e
Clozapine - agranulocytosis, seizures, tachy, hypersalivation, myocarditis
Olanzapine - HLD, glucose intolerance, wt gain, LFT increase (metabolic syndrome!)
Quetiapine - cataracts (maybe), sedation, orthostatic hypotension
CHECK FOR METABOLIC SYNDROME!
Risk of mortality and stroke in elderly (black box warning)
Which atypical antipsychotics approved for mania?
Quetiapine Ziprasidone olanzapine aripiprazole Risperidone
Mood stabilizers
Lithium
Carbamazepine
Valproic acid
Lithium uses, MoA
Tx acute mania
Ppx manic and depressive episodes in bipolar
MoA:
- inhibit inositol-1-phosphatase in neurons
- metabolized by kidney
Factors affecting Li levels
Decreasing:
- NSAIDs
Increasing:
- dehydration
- salt deprivation
- impaired renal fxn
diuretics
ASA
Lithium S/E
Fine tremor sedation ataxia thirst metallic taste polyuria wt gain cardiac arrhythmias alopecia
HYPOTHYROIDISM
Nephrogenic DI
nephrotoxicity
Can cause Ebstein’s anomaly in 1st trimester
Carbamazepine uses as mood stabilizer
Good for:
mixed episodes
rapid-cyclinc bipolar
Trigeminal neuralgia
Blocks Na channels and inhibits A/P
Carbamazepine S/E
Leukopenia
Hyponatremia
Aplastic anemia
Agranulocytosis
inc LFTs
NOT ok for preggers (neural tube defects)
Autoinducer
Toxicity: stupor confusion ataxia tremor nystagmus vomiting
Valproate uses as mood stabilizer
Mixed manic epi
rapid cycling bipolar
Valproate S/E
Hepatotoxicity
Thrombocytopenia
Neural tube defects in preggers
Benzodiazepine MoA
Potentiating effects of GABA - increase action on GABA
Long acting benzos
- names
- uses
Chlordiazepoxide
- EtOH detox
- presurgery anxiety
Diazepam
- anxiety
- seizure control
Clonazepam
- panic attacks
- anxiety
- not ok for renal dysfunction
Immediate acting benzos
- names
- uses
Alprazolam
- panic attacks
- SHORT onset of action
Lorazepam
- panic attacks
- alcohol w/d
- ok for liver dz
Oxazepam
- EtOH and sedative detox
- ok for liver dz
Temazepam
- insomnia
Short acting benzos
- names
- uses
Triazolam
- insomnia
Midazolam
Benzo S/E
Drowsiness
Falls / reduced motor coordination
Toxicity: respiratory depression w/ OD
Zolpidem
Zaleplon
Eszopiclone
NOn-benzo hypnotic
- short term use for insomnia
- bind to benzo 1 site on GABA receptor
- no anticonvulsant or muscle relax properties
- no w/d
- minimal rebound insomnia
- little tolerance/dependence
SE: anterograde amnesia, hallucinations, sleepwalking
Buspirone
Non-benzo anxiolytic
Acts at 5HT-1A receptor (partial agonist)
slower onset action than benzos
For generalized anxiety d/o
Low potential for abuse
Doesn’t potentiate CNS depressino of alcohol
Propanolol can be used to tx…
Autonomic effects of panic attacks (palps, diaphoresis, tachy)
Akathisia
Meds causing psychosis
Sympathomimetics analgesics abx (INH) anticholinergic anticonvulsants antihistamines corticosteroids anti-parkinson drugs
Meds causing agitation/confusion/delirium
May be caused by antipsychotics, antidepressants, antiarrhythmics, antineoplastics,
corticosteroids, cardiac glycosides, NSAIDs, antiasthmatics, antibiotics,
antihypertensives, antiparkinsonian agents, and thyroid hormones
Meds causing depression
antihypertensives, antiparkinsonian agents, corticosteroids,
calcium channel blockers, NSAIDs, antibiotics, and peptic ulcer drugs
Meds causing anxiety
sympathomimetics, antiasthmatics, antiparkinsonian
agents, hypoglycemics, NSAIDs, and thyroid hormones
Meds causing sedation/ poor ocncentration
antianxiety agents/hypnotics, anticholinergics, antibiotics,
and antihistamines
Antipsychotic with highest cardio toxicity
IV haloperidol