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Pharm- Nerv. System
Nervous System/Pharm/Affective Disorders I and II - OM-4
| Question | Answer |
|---|---|
| Some basic theories of Depression ? | * Neurotrophic Hypothesis - loss of neurotrophic transport is cause from loss of BDNF -antidepressants increase BDNF * - |
| All available antidepressants effect ? | *the monoamine system -enhance synaptic availability of serotonin, norepinephrine, or dopamine |
| Classes of Antidepressants ? | *SSRIs * Serotonin-Norepinephrine Reuptake Inhibitors -SNRIs and Tricyclic Antidepressants * Serotonin Antagonists * Monoamine Oxidase Inhibitors * Tetracyclic and Unicyclic Antidepressants |
| Most common SSRIs ? | * Fluoxetine * Sertraline * Paroxetine * Escitalopram |
| Most common SNRIs ? | * Duloxetine * Milnacipran *Venlafaxine |
| Most common Tricyclic Antidepressants? | * Amitriptyline |
| Most common Serotonin Antagonists? | * Trazodone |
| Most common Monoamine Oxidase Inhibitors? | * Phenelzine |
| Most common Tetracyclic/Unicyclic? | * Buproprion |
| Most common Bipolar Drugs used ? | * Lithium * Lamotrigine (others = Carbamazepine and Valproic Acid) |
| SSRIs MoA ? | * allosterically binds to serotonin receptor, SERT, to produce a conformational change and blocks serotonin from being taken in to the cells to allow higher extracellular serotonin levels |
| SSRIs pharmakinetics ? | * rather long half lifes * Fluoxetine has an active metabolite, Norfluoxetine, which has a 180 hour t1/2 !!! * have interactions with CYP's, so if on other drugs metabolized by them, need to monitor dose, or get toxicities |
| With Fluoxetine, since its active metabolite lasts so long, what has to happen before given a treatment with a MAOI ? | * has to be discontinued for at least 4 weeks before MAOI tmt |
| SSRI receptor/transporter effects ? | * high affinity for SERT, so no real issue in effecting other transporters/receptors |
| Clinical Indications to use SSRIs ? | *Major depression *Generalized anxiety disorder *PTSD *OCD *Panic disorder *PMDD (premenstrual dysphoric disorder) *Bulimia |
| SSRIs side effects ? | *sexual dysfunction (low libido) *GI upset, N/D * weight gain (paroxetine) |
| What is Discontinuation Syndrome ? | * when a short half life SSRI (paroxetine, sertraline) is suddenly stopped - get dizziness and paresthesias (tingling) *so need to taper off of SSRIs |
| SSRIs and enzyme inhibition ? | *CYPD2D6 is inhibited by (paroxetine and fluoxetine) *CYP3A4 is inhibited by (fluvoxamine) |
| SNRIs MoA ? | * Bind both SERT and norepinephrine transporter (NET) to do the same thing as SSRIs * higher affinity to SERT * little affinity for other receptors |
| Of the SNRIs, which is the only one that does not have balanced inhibition toward both receptors, but has low inhibition towards NET ? | * Venlafaxine (others may be "balanced", but still have higher affinity to SERT) |
| SNRIs t1/2 and enzyme interactions? | * a little shorter t1/2 than SSRIs, so may have to give more often *Duloxetine and Venlafaxine are metabolized by CYP2D6 |
| SNRIs clinical indications to use? | * Depression *Pain Disorders -Milnacipran – fibromyalgia -Duloxetine – diabetic neuropathic pain, and chronic musculoskeletal pain |
| SNRIs adverse side effects ? | * SSRIs side effects * increased HR, BP, CNS (insomnia, anxious, agitation) |
| Toxicity that is higher in SNRIs over SSRIs ? | * see higher cardiac toxicities with Venlafaxine) |
| If SNRIs are discontinued suddenly ? | * see the similar Discontinuation Syndrome we see in SSRIs |
| SNRIs adverse drug interactions ? | * fewer CYPP450 interactions than SSRIs *CYP2D6 is inhibited by Duloxetine |
| Contraindicated with SNRIs use ? | * Contraindicated with monoamine oxidase inhibitors (MAOI), b/c it leads to serotonin syndrome |
| Tricyclic Antidepressants(TCADs) MoA ? | * inhibits SERT and NET *in antidepressant use, it inhibits 5-HT and NE reuptake *within the TCADS, there is major variability in SERT and NET binding affinity |
| Main reason why TCADS are not popular to use ? | * b/c they interact with almost every type of receptor instead of specific ones -get lots of side effects |
| TCADS t 1/2 and enzyme interactions ? | *dosed at night due to sedative effects * shorter t 1/2 *all metabolized by CYP2D6, so can be an issue if other drugs also need CYP2D6 to be broken down |
| TCADs adverse side effects ? | *Potent antimuscarinic effects--->dry mouth, constipation (anti-DUMBBELSS) *Potent antihistamine effects -weight gain and sedation *Sexual Dysfunction |
| TCAD that causes bed wetting in kids? | *Imipramine |
| TCAD that can cause pain ? | *Amitriptyline |
| TCAD prescribed often to relieve puritus (itching) ? | *Doxepin |
| A certain issue that TCADS can cause that is life threatening in people with cardiac issues ? | * TCADs cause an α-adrenergic blockade and can cause severe orthostatic hypotension *avoid TCADs in ppl on antiHTN drugs |
| If TCADs are discontinued abruptly ? | * Get Prominent discontinuation syndrome characterized by cholinergic rebound (dumbbelss) and flu-like symptoms |
| Anti-DUMBBELSS mnemonic for anti-muscarinic actions ? | Constipation No Urination Mydriasis Bronchodilation Tachycardia No Emesis No Tearing Dry Mouth No Sweat |
| Muscarinic agonist DUMBBELSS mnemonic ? | Diarrhea Urination Miosis Bronchoconstriction Bradycardia Emesis Lacrimation Salivation Sweating |
| TCAD adverse drug reactions ? | *get high drug levels when other drugs are also using CYP2D6 or inhibiting it *additive effects if also given anticholinergic or antihistamine |
| Since CYP2D6 can vary genetically, what can happen to TCADs? | *can cause rapid/slow metabolization of the drugs -drug can have high effects in low doses or don't see any drug effects b/c being metab. too quickly |
| Clinical indications when we would use TCADs? | *Treatment of depression unresponsive to SSRIs and SNRIs |
| Serotonin Antagonist MoA ? | *block 5-HT2A receptor (same target as LSD) -drug= Trazodone |
| 5-HT2A Antagonist half life and drug adverse effects? | *t 1/2 is short, need multiple doses *black box for SUICIDE |
| 5-HT2A drug interactions ? | *Trazadone is CYP3A4 substrate -Inhibitors can increase concentration of trazadone |
| 5-HT2A clinical uses ? | *Major depression (approved use; more historical) *Hypnotic (unlabeled but most common use) |
| Monoamine Oxidase Inhibitors (MAOIs)MoA ? | * Drugs target MAO-A and MAO-B, non-selectively to increase monoamine content (structurally resemble amphetamines and can cause CNS stimulation increase) |
| (review) MAO-A consists of ? | *in dopamine and norepinephrine neurons -make Epi, NE, and Serotonin |
| (review) MAO-B consists of ? | *in serotonin and histamine neurons -make tyramine, phenylethylamine, and benzylamine |
| Both MAO-A and B metabolize ? | *tryptamine and dopamine |
| MAOI adverse drug side effects ? | *orthostatic HTN and weight gain -top reasons drugs are stopped |
| MAOI sudden discontinuation causes? | *a delirium like state (psychosis, excitement, confusion) -if given to the elderly, lower dose |
| If MAOIS are given with SSRIs, SRNIs, or TCADS? | *get serotonin syndrome (cardiac, coma, clonus) *Must have a 2 week drug free window before giving a MAOI and 2 week window after its use before giving a SSRIs, SRNIs, or TCAD. -triad of the 3 C's |
| If MAOIs are given in the presence of tyramine ? | * tyramine is broken down by MAO, so we get high levels in blood *causes HIGH BP (risk for MI, malignant HTN, or stroke) *avoid aged cheeses and tap beer |
| If MAOIs are given in the presence of a Sympathomimetic (OTC cold meds) ? | * the containing pseudoephedrine and phenylpropanolamine in them cause a spike in HIGH BP |
| MAOI clinical use ? | *Treatment of depression unresponsive to other drugs |
| Unicyclic/Tetracyclic Drugs - Bupropion MoA ? | * poorly understood - inhibits NE and Dopamine reuptake with no effect on Serotonin |
| Good reason why we might put someone on Bupropion ? | * does not cause Sexual Dysfunction -so give it to someone have this side effect with the other drugs |
| Unique pharmakinetic action of Bupropion ? | * biphasic elimination - 1st past lasts 1 hr and 2nd pass lasts 14 hours - so a good t 1/2 |
| Buproion adverse side effects ? | * agitation, insomnia, and anorexia |
| Buproion adverse drug interactions ? | * its major metabolite, hydroxybupropion, is a moderate inhibitor of CYP2D6 *Avoid in ppl on MAOIs also |
| Clinical uses of Buproion ? | * Depression not responsive to other agents and if sexual dysfunction is a side effect of another drug |
| Drug of Choice for Major Depressive Disorder ? | * SSRIs or SNRIs |
| DOC for PTSD ? | * SSRIs (according to USMLE First Aid) |
| DOC for Anxiety ? | * SSRIs |
| Why TCADs and Buproion are 2nd line drugs ? | * due to their adverse effectc |
| MoA of Lithium in Bipolar Disorders? | *Treats the MANIC phase of Bipolar * not known *Possibly Effect on electrolytes/ion transport, or Effects on inositol signaling, or effects on second messengers |
| MoA of Lamotrigine in Bipolar Disorders? | * Treats the DEPRESSIVE episode of Bipolar |
| Lithium absorption and metabolism ? | * absorbed in 6-8 hrs * there is NO metabolism and it is excreted as Lithium |
| Lithium neurologic side effects ? | *Tremor *Motor hyperactivity - uncontrolled mvts and ataxia *difficulty talking *Psychiatric - confusion |
| Other Lithium side effects ? | * low thyroid function - test TSH lvls * Renal - Nephrogenic Diabetes Insipidus, Polydipsia and polyuria are common * Cardiac - depresses sinus nodes (contraindicated in bradycardic pts.) *Edema - most common *Acne |
| Actions to take when treating someone with Lithium ? | * it has a slow onset, so give a benzo if in a severe manic episode til it kicks in *Monitor serum levels since it has a narrow TI |
| Lithium Adverse Drug Reactions ? | * Thiazides and NSAIDS cause clearance to be slowed |
| Lithium in pregnant people ? | * It causes an increase in renal clearance, so after drug is given, it rapidly reverts back to low levels * Can be transferred to newborns in breast milk - cause Lethargy, cyanosis, poor suck and Moro reflexes, hepatomegaly |
| Lithium Overdose level and how to fix ? | *usually get on a therapeutic dose due to low Na levels or start a thiazide/NSAID, etc. * if serum Lithium exceeds > 2 mEq/L * easily fixed on dialysis |
Created by:
thamrick800
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