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In this This Is Why pharmacology review, Dr. Busti unpacks the Serotonin–Norepinephrine Reuptake Inhibitors (SNRI)—how they evolved as “cleaner, safer TCA-like” options and why they’re often the next step after SSRIs for major depressive disorder and anxiety disorders. We compare the class head-to-head and zoom into real-world decisions: when SNRIs shine (e.g., pain comorbidities), when to be cautious (e.g., hypertension, SIADH/hyponatremia, discontinuation syndrome), and how dose and kinetics shape outcomes (e.g., venlafaxine as SSRI at low dose, true SNRI at higher doses).
You’ll get crisp pearls on the key agents—duloxetine, venlafaxine, desvenlafaxine, milnacipran, levomilnacipran—including indications beyond MDD (GAD, panic/social anxiety, neuropathic pain, fibromyalgia, chronic MSK pain; regional use in stress urinary incontinence), common adverse effects, interaction traps (e.g., MAOI washouts, serotonergic stacking), and a practical monitoring & counseling checklist you can use tomorrow.
Chapter Table of Contents
00:00 Introduction to SNRIs: Serotonin–Norepinephrine Reuptake Inhibitors
02:44 SNRI Clinical Indications: MDD, GAD, Fibromyalgia, Chronic Pain & Other Approved Uses
03:08 SNRI Drug Lineup: Venlafaxine, Desvenlafaxine, Milnacipran, Levomilnacipran
04:00 Mechanism of Action: Reuptake Inhibition & CNS Pathways
10:24 Side Effects: Serotonergic Effects, Sympathomimetic Effects & CNS Activation
20:10 Pharmacokinetics & Metabolism: CYP Pathways, Substrates, Inhibitors & Drug Interactions
21:44 Class-Wide Side Effect Comparison: GI, Insomnia, Hemodynamic Effects & Tolerability
22:35 Clinical Pearls: Energy Effects, Selectivity, and Choosing the Right SNRI
#SNRI #SNRIantidepressants #pharmacology #PsychiatryPharmacology #medicaleducation
Speaker:
Anthony Busti, MD, PharmD, MSc, FAHA, FNLA, is a licensed healthcare professional and medical educator with over 30 years of experience in clinical practice and academic teaching. He has trained and practiced as a nurse, pharmacist, and physician, bringing a uniquely comprehensive perspective to patient care and medical education.
Dr. Busti is dedicated to advancing evidence-based medicine and helping clinicians understand the underlying “why” behind clinical decisions to improve patient outcomes.
About This Channel:
This content is created by Anthony Busti, MD, PharmD, MSc, FAHA, FNLA, a board-certified physician with training at Johns Hopkins School of Medicine and University of Oxford and a medical educator for healthcare professionals and students. All material is based on current medical literature and evidence-based guidelines that align with principles of evidence-based medicine (EBM) and Evidence-Based Healthcare (EBHC).
Disclaimer:
This content is for educational purposes only and is not medical advice. It does not replace individualized evaluation, diagnosis, or treatment. Always seek the advice of a qualified health provider with questions about a medical condition and never delay care because of educational content.
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