Mechanisms based classification & challenges in therapeutic applications. Hopefully it would be useful to medical students and also students of pharmacy, Ayurveda, homeopathy studying pharmacology.
Anti-depressant drugs. Dr. Ashok Kumar Batham,M.D.,DrAshok Batham
This presentation gives a broad and comprehensive overview of anti-depressants. Mono-aminergic theory of depression which forms the basis of development of anti-depressant drugs is given along with the history of development of these drugs. Subsequently, mechanism-based classification, uses, efficacy and general adverse effects of anti-depressants are systematically described. Hopefully, this slide-share would be useful to medical students and also to those studying clinical pharmacy, and undergoing basic training in pharmaceutical marketing.
Antidepressants and anxiolytics by Dr. Basil TumainiBasil Tumaini
Antidepressants and anxiolytics by Dr. Basil Tumaini, prepared and presented during psychiatry rotation at Muhimbili University of Health and Allied Sciences
Anti-depressant drugs. Dr. Ashok Kumar Batham,M.D.,DrAshok Batham
This presentation gives a broad and comprehensive overview of anti-depressants. Mono-aminergic theory of depression which forms the basis of development of anti-depressant drugs is given along with the history of development of these drugs. Subsequently, mechanism-based classification, uses, efficacy and general adverse effects of anti-depressants are systematically described. Hopefully, this slide-share would be useful to medical students and also to those studying clinical pharmacy, and undergoing basic training in pharmaceutical marketing.
Antidepressants and anxiolytics by Dr. Basil TumainiBasil Tumaini
Antidepressants and anxiolytics by Dr. Basil Tumaini, prepared and presented during psychiatry rotation at Muhimbili University of Health and Allied Sciences
ANTIDEPRESSANTS: All you need to know...by RxVichu! :)RxVichuZ
This is my 50th powerpoint.......
Deals with Important tips while using ANTIDEPRESSANTS, their special precautions, ADRs and differential mechanisms.
Will be worthwhile for a precise insight!!
Thanking all viewers who have supported me all my ways to reach this 50th milestone!!
Regards,
Vishnu. :)
An overview of atypical anti depressantsBrajesh Lahri
This powerpoint presentation deals with the pharmacology and psychiatric uses of atypical anti-depressants. TCAs and SSRIs are considered as typical anti-depressants, while other classes include SNRI, RIMAs and atypical antidepressants. In this presentation, i have briefly given an overview of atypical anti-depressants as well as of SNRIs and RIMAs.
This 13-slide slide set created with PowerPoint provides an introduction to antidepressants describing their discovery and development; their modes of action and relationship to the monoamine hypothesis of depression; and their efficacy, latency and unwanted actions. The beginner level introduction is tailored to aid the understanding of individual antidepressants. Contributed by Christopher Fowler, Umeå University, Sweden.
SSRIs(Antidepressants): A deep insight: By RxVichuZ!! ;)RxVichuZ
This work deals with SSRIs, used clinically in the management of depression. Relevant pharmacology details, including special catchpoints regarding individual drugs has also been focused upon.
My 76th powerpoint...
ANTIDEPRESSANTS: All you need to know...by RxVichu! :)RxVichuZ
This is my 50th powerpoint.......
Deals with Important tips while using ANTIDEPRESSANTS, their special precautions, ADRs and differential mechanisms.
Will be worthwhile for a precise insight!!
Thanking all viewers who have supported me all my ways to reach this 50th milestone!!
Regards,
Vishnu. :)
An overview of atypical anti depressantsBrajesh Lahri
This powerpoint presentation deals with the pharmacology and psychiatric uses of atypical anti-depressants. TCAs and SSRIs are considered as typical anti-depressants, while other classes include SNRI, RIMAs and atypical antidepressants. In this presentation, i have briefly given an overview of atypical anti-depressants as well as of SNRIs and RIMAs.
This 13-slide slide set created with PowerPoint provides an introduction to antidepressants describing their discovery and development; their modes of action and relationship to the monoamine hypothesis of depression; and their efficacy, latency and unwanted actions. The beginner level introduction is tailored to aid the understanding of individual antidepressants. Contributed by Christopher Fowler, Umeå University, Sweden.
SSRIs(Antidepressants): A deep insight: By RxVichuZ!! ;)RxVichuZ
This work deals with SSRIs, used clinically in the management of depression. Relevant pharmacology details, including special catchpoints regarding individual drugs has also been focused upon.
My 76th powerpoint...
This comprehensive presentation is aimed at opening the window to the knowledge of Anti-epileptic Drugs (AEDs). It provides a very useful mechanism-based classification explaining the mechanisms of action and therapeutic applications of AEDs. Common problems associated with AEDs and important pharmacokinetic features of these drugs are described. Salient features of the available AEDs are described.
Major depressive disorder and its treatmentAmruta Vaidya
A concise presentation on major depressive disorder, the drug treatment options available i.e. conventional and emerging therapies which are available.
Anti epileptic drugs used for non-epileptic disorders : Dr. Ashok Kumar BathamDrAshok Batham
This presentation highlights the uses of anti-epileptic drugs in non-epileptic disorders, such as painful neuropathies like diabetic polyneuropathy, post-herpetic neuralgia, sciatic pain with spinal cord disease, trigeminal neuralgia; bipolar disorder; generalised anxiety disorder; cardiac arrhythmias, migraine prophylaxis; obesity etc. It would be useful to students of pharmacology studying in medical, pharmacy, Ayurvedic and homeopathic colleges, and those working in pharmaceutical industry.
Anti-epileptic Drugs : Applications Outside Epilepsy
(Reverse Engineering)
Anti-epileptic Drugs are Approved and Used Outside Epilepsy. Phenytoin, Carbamazepine, and Oxcarbazepine have proven efficacies in Trigeminal Neuralgia.
Gabapentin and Pregabalin are established in the treatment of postherpetic neuralgia (PHN) and painful diabetic neuropathy (PDN).Divalproex sodium is approved for use in the treatment of bipolar disorder and prevention of migraine.
Overlapping pathophysiology of some disorders and mechanisms of action of many Anti-epileptic Drugs : Applications Outside Epilepsy
(Reverse Engineering)antiepileptic drugs are evidently responsible for the applications of anti-epileptic drugs (AEDs) in clinical conditions outside epilepsy.
New drug candidates will, therefore, be developed for both the sets of therapeutic applications (epilepsy and outside epilepsy).
Hypnotics : Based on New Concepts (orexin/hypocretin antagonism, melatonin ag...DrAshok Batham
This slide share is all about the sleeping-pills available to the practitioners of modern medicine. Hypnotics, the drugs used to treat insomnia (difficulty in falling asleep, staying asleep, frequent awakenings in the night, morning awakening without feeling fresh) are described with special reference to drugs based on New Concepts (orexin/hypocretin antagonism, melatonin agonism, GABA-agonism) in the back-drop of old drugs. This way all the hypnotic drugs, including the new as well old, and drugs having sedating effects, such as, some anti-histaminics, used in insomnia, are included in this presentation, with the hope that medical students and those studying pharmacology in pharmacy and ayurvedic colleges will find it useful.
Depressive Disorders: An Overview of Full Spectrum. Dr. Ashok Kumar Batham.DrAshok Batham
Medical specialists outside the area of psychiatry and those who practice family medicine generally get fragmented information about mental depression. Therefore, an endeavour has been made to provide a complete overview of various depressive disorders, such as, Major Depressive Disorder (MDD), Persistent Depressive Disorder (PDD) or Dysthymia, Disruptive Mood Dysregulation Disorder (DMDD), Premenstrual Dysphoric Disorder (PMDD), Substance/Medication Induced Depressive Disorder, Depressive Disorder Due to Another Medical Condition, and other depressive disorders. DSM-5 diagnostic criteria of each of these disorders are given along with vignettes of diagnosis and treatment of the same are presented. Hopefully, this slide share will help non-psychiatrists to understand the complete spectrum of depressive disorders.
Anti-anxiety Drugs:Benzodiazepine Receptor Agonists. Dr. Ashok Kumar Batham, ...DrAshok Batham
This presentation titled “Anti-anxiety Drugs: Benzodiazepine Receptor Agonists” includes the pharmacological actions, mechanism of actions, pharmacokinetics, and clinically relevant classifications of Benzodiazepines. Non-Benzodiazepine drugs acting through Gaba-ergic benzodiazepine receptors are also described comprehensively.
Benzodiazepine receptor antagonist, flumazenil, used as an anti-dote in poisoning is also described.
Hopefully, students of pharmacology and medicine in medical and pharmacy colleges will find it useful. Marketing and sales teams of pharmaceutical companies may also find this presentation useful from the point-of-view of understanding their products in proper perspective.
Anti-migraine drugs. Dr. Ashok Kumar Batham,MB,BS,MD,DCR, DrAshok Batham
This presentation on Migraine and Anti-Migraine Drugs provides a comprehensive description of migraine including its symptomatology and pathophysiology. On the basis of these aspects drugs used in the treatment of migraine are described with special emphasis on ergotamines and tryptans.
Hopefully, students of pharmacology and medicine in medical and pharmacy colleges will find it useful. Marketing and sales teams of pharmaceutical companies may also find this presentation useful from the point-of-view of understanding their products in proper perspective.
This presentation is made for students of Pharmacology and Medicine to apprise them of the basic features of Parkinson's Disease and evolution of its drug treatment strategies. Important drugs used in Parkinso's Disease are described. Marketing and Sales teams of pharmaceutical companies may also find it useful.
Bioequivalence study Exemptions- and Waivers:Ashok Kumar Batham.ashokpharmaco...DrAshok Batham
BIOEQUIVALENCE STUDY: EXEMPTIONS AND WAIVERS
This presentation is based on:
1. Waiver of In Vivo Bioavailability and Bioequivalence Studies for Immediate-Release Solid Oral Dosage Forms Based on a Biopharmaceutics Classification System Guidance for Industry
U.S. Department of Health and Human Services Food and Drug Administration
Center for Drug Evaluation and Research (CDER).December 2017. Biopharmaceutics.
2. ICH guideline Q3D M9 on biopharmaceutics classification system based biowaivers
EMA/CHMP/ICH/493213/2018
3. Guidelines For Bioavailability & Bioequivalence Studies
Central Drugs Standard Control Organization, Directorate General of Health Services, Ministry of Health & Family Welfare, Government of India, New Delhi.
(March 2005)
Objectives of this presentation:
Understand the drug regulatory requirements for:
Conducting Bioequivalence Study or
Not Conducting Bioequivalence Study for obtaining regulatory marketing authorization for pharmaceutical formulations,
Bioequivalence studies are required or mandatory for certain formulations,
Exemptions are available for Bioequivalence Studies on certain formulations,
Waivers are granted by drugs regulatory authorities in certain cases, like Biopharmaceutical Classification System (BCS) Class-I and Class-III, Pharmaceutical Drugs, and some drug products with high safety margin,
Propose a clinical classification system-Biotherapeutics Classification System (BTCS) based upon:
Bioavailability of pharmaceutical drug, and
Clinical Safety Margin of pharmaceutical drug
Based on this Biotherapeutics Classification System (BTCS) Waivers may be requested for some pharmaceutical drug formulations, such as those with High Bioavailability and High safety Margin.
New Drugs For Multiple Sclerosis approved by The US FDA in 10 Years.DrAshok Batham
There is no specific curative drug available for the treatment of multiple sclerosis.
Fortunately, a large number of disease modifying drugs have been developed.
New drug development for the treatment of multiple sclerosis is a hot-area, a large number of disease modifying drugs have been developed in the last 2 decades.
Nearly 70 different drugs are now available to deal with this debilitating and disabling disease.
The list presented here includes 10 disease modifying drugs approved by the US FDA in the last 10 years, from January 2010 to October 2019.
In addition to these, a drug, Ampyra (Dalfampridine) 10 mg tablet has been approved by the US FDA in January 2010 for improvement of walking capacity in multiple sclerosis.
Drugs function by altering the existing bodily functions in disease and health; they do not produce any new thing in the body. Essentially, drugs either stimulate or inhibit existing physiological activities, kill disease causing germs, destroy cancer cells, replenish endogenous hormones and correct their deficiencies, and correct deficiencies of vitamins, minerals, essential amino acids, essential fatty acids and anti-oxidants.
This slide presentation gives an overview of all the basic disease processes or mechanisms through which diseases occur and would help the common man have a good understanding of diseases.
This presentation is aimed at putting to-day's antihistamine drugs in a broad and proper perspective. Anti-histamines are classified based on their chemistry and more importantly on the chronology of their introduction. Their general actions, uses, pharmacokinetic features, and adverse effects are described making it easy for medical and pharmacy students to understand this class of widely used drugs.
Epilepsy and antiepileptics. Dr.Ashok Kumar Batham,M.D.,DrAshok Batham
This presentation provides relevant description and classification of epilepsy with easy-to-remember mechanism-based and chemistry-based classifications of Anti-epileptic Drugs (AEDs). General features and salient details of all the Anti-epileptic Drugs (AEDs) are provided that can be used as short-notes. Hopefully, this presentation would be useful to students of medicine, pharmacology, pharmacy, clinical pharmacy, and representatives of pharmaceutical companies.
This presentation provides all the relevant information about mental depression and anti-depressants. It will be useful to students of medicine, pharmacology, pharmacy, and pharmaceutical industry.
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
Factory Supply Best Quality Pmk Oil CAS 28578–16–7 PMK Powder in Stockrebeccabio
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These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
MANAGEMENT OF ATRIOVENTRICULAR CONDUCTION BLOCK.pdfJim Jacob Roy
Cardiac conduction defects can occur due to various causes.
Atrioventricular conduction blocks ( AV blocks ) are classified into 3 types.
This document describes the acute management of AV block.
Title: Sense of Smell
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the primary categories of smells and the concept of odor blindness.
Explain the structure and location of the olfactory membrane and mucosa, including the types and roles of cells involved in olfaction.
Describe the pathway and mechanisms of olfactory signal transmission from the olfactory receptors to the brain.
Illustrate the biochemical cascade triggered by odorant binding to olfactory receptors, including the role of G-proteins and second messengers in generating an action potential.
Identify different types of olfactory disorders such as anosmia, hyposmia, hyperosmia, and dysosmia, including their potential causes.
Key Topics:
Olfactory Genes:
3% of the human genome accounts for olfactory genes.
400 genes for odorant receptors.
Olfactory Membrane:
Located in the superior part of the nasal cavity.
Medially: Folds downward along the superior septum.
Laterally: Folds over the superior turbinate and upper surface of the middle turbinate.
Total surface area: 5-10 square centimeters.
Olfactory Mucosa:
Olfactory Cells: Bipolar nerve cells derived from the CNS (100 million), with 4-25 olfactory cilia per cell.
Sustentacular Cells: Produce mucus and maintain ionic and molecular environment.
Basal Cells: Replace worn-out olfactory cells with an average lifespan of 1-2 months.
Bowman’s Gland: Secretes mucus.
Stimulation of Olfactory Cells:
Odorant dissolves in mucus and attaches to receptors on olfactory cilia.
Involves a cascade effect through G-proteins and second messengers, leading to depolarization and action potential generation in the olfactory nerve.
Quality of a Good Odorant:
Small (3-20 Carbon atoms), volatile, water-soluble, and lipid-soluble.
Facilitated by odorant-binding proteins in mucus.
Membrane Potential and Action Potential:
Resting membrane potential: -55mV.
Action potential frequency in the olfactory nerve increases with odorant strength.
Adaptation Towards the Sense of Smell:
Rapid adaptation within the first second, with further slow adaptation.
Psychological adaptation greater than receptor adaptation, involving feedback inhibition from the central nervous system.
Primary Sensations of Smell:
Camphoraceous, Musky, Floral, Pepperminty, Ethereal, Pungent, Putrid.
Odor Detection Threshold:
Examples: Hydrogen sulfide (0.0005 ppm), Methyl-mercaptan (0.002 ppm).
Some toxic substances are odorless at lethal concentrations.
Characteristics of Smell:
Odor blindness for single substances due to lack of appropriate receptor protein.
Behavioral and emotional influences of smell.
Transmission of Olfactory Signals:
From olfactory cells to glomeruli in the olfactory bulb, involving lateral inhibition.
Primitive, less old, and new olfactory systems with different path
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
5. TRICYCLIC ANTIDEPRESSANTS (TCAs) - MOA
• Block the neuronal reuptake of NE as well as 5-HT, e.g.
Imipramine, Amitriptyline, Doxepin
• Individual TCAs produce varying effects on NE and 5-HT
reuptake
• Inhibition of NE-reuptake is relatively more than 5-HT
reuptake in case of Desipramine, Nortriptyline, Protriptyline,
Amoxapine
• Clomipramine is more selective in blocking 5-HT reuptake
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
5
6. TRICYCLIC ANTIDEPRESSANTS (TCAs) - MOA
• All the TCAs produce blockade of alpha1, muscarinic and
histaminergic receptors which is responsible for a number of side
effects
• Some TCAs produce relatively more sedation, e.g. Doxepine,
Trimipramine
• Some TCAs are useful in painful neuropathies and fibromyalgia,
e.g. Amitriptyline
• Doxepine is an effective anti-pruritic when used orally as well
topically
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
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8. SSRIs : Mechanisms of action
I. Selective inhibition of serotonin reuptake by blockade of Serotonin Transporter
(SERT) which leads to:
• Increased serotonin levels and dwell-time in the synapse
• Increased serotonin receptor density and sensitivity
• Increased receptor-G protein coupling and cyclic nucleotide signaling (enhanced
GPCR activity)
• Increased expression of downstream gene especially for BDNF (brain derived
neurotrophic factor) responsible for neurotrophic activities
• Increased neurogenesis in hippocampus
• Enhanced serotonergic neurotransmission
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
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9. SSRIs : Mechanisms of action
II Stimulation of presynaptic auto-receptors- 5-HT1A,
5-HT7 and 5-HT1D leading to reduced release of 5-
HT; however, chronic administration of SSRIs leads to
down-regulation and desensitization of auto-
receptors which causes resumption of normal
serotonin release.
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
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11. SNRIs : Mechanisms of action
Development of these drugs is inspired by TCAs which inhibit reuptake of
serotonin as well as norepinephrine leading to enhanced neurotransmission as
in case of SSRIs
• These drugs, unlike TCAs, do not block other receptors, like alpha1,
muscarinic and histaminergic, and thus do not produce consequent
undesirable effects
• SNRIs are indicated in Depression, Anxiety, Panic, Neuropathic pain,
Fibromyalgia
• Used off-label in Urinary incontinence, Premenstrual dysphoric disorder,
PTSD, Painful states, Hot flashes, Binge eating disorders, Autism
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
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13. SEROTONIN RECEPTOR ANTAGONISTS
Agents: Nefazodone, Trazodone, Mirtazapine, Mianserine
MOA:
1. Trazodone and Nefazodone block 5-HT2 and alpha1 receptors
2.Mianserine and Mirtazapine predominantly block (a) H1-receptors and produce
sedation, (b) 5-HT2 family of receptors (5-HT2A, 5-HT2c, 5-HT3) like atypical
antipsychotics.
These drugs are often combined with SSRIs for greater antidepressant effects
Adverse effects: (a) Somnolence, increased appetite and weight gain with
Mirtazapine and Mianserine, (b) Agranulocytosis reported with Mirtazapine,( C)
Nefazodone withdrawn because of hepatotoxicity.
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
13
15. NDRI : Bupropion
• Blocks reuptake of NE and Dopamine (DA), enhances neurotransmission
• Possibly also causes pre-synaptic release of NE and DA
• Active metabolite of bupropion, hydroxybupropion, also contributes to the
therapeutic effects
• Used in combination with SSRIs to produced enhanced antidepressant effects
through triple Reuptake Blockade (5-HT,NE and DA)
• Bupropion is used in Depression, Smoking cessation, Seasonal depressive
disorder, PTSD, Neuropathic pain, Fibromyalgia and Weight loss.
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
15
17. NON-SELECTIVE MAO-INHIBITORS
• Phenelzine | Isocarboxazid | Tranylcypromine
• All of the above are irreversible non-selective MAO-
Inhibitors (inhibit MAO-A and MAO-B)
• Block metabolic degradation of NE,DA, and 5-HT
• Also produce down regulation of presynaptic alpha2-
receptors
• Use runs the risk of food and drug interactions
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
17
18. MAO-B Inhibitor - Selegiline
• Selegiline is a reversible inhibitor of MAO-B which is
located in serotonergic neurons
• Selegiline is used in PD and Depression
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
18
19. REVERSIBLE INHIBITORS OF MAO-A (RIMA)
• Moclobemide
• Metralindole
• Pirlindole
• Toloxatone
• Bifemelane – RIMA. and weak NRI
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
19
20. ANTI-PSYCHOTICS USED AS ADJUNCTS IN DEPRESSION
• Aripiprazole
• Brexpiprazole
• Lurasidone
• Olanzapine
• Quetiapine
• FDC of Olanzapine 6|12 mg and
Fluoxetine 25|50 mg (Symbax)
approved by the US FDA.
• Risperidone – (used off-label)
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
20
22. ATYPICAL ANTIPSYCHOTICS
• Some of the atypical antipsychotics (Olanzapine, Aripiprazole, Quetiapine,
and Risperidone) are used for augmentation of SSRIs and SNRIs
• FDC of Olanzapine 6|12 mg and Fluoxetine 25|50 mg (Symbax) approved
by the US FDA.
• Quetiapine used for depressive episodes in bipolar disorder, under review
for approval in major depression and GAD.
• Amisulpride is used in dysthymia
• Lurasidone is used for depressive episodes in bipolar disorder
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
22
23. OTHERS
• Agomelatine -
5HT2C receptor antagonist and MT1 and MT2 receptor agonist
• Ketamine – non-competitive NMDA receptor antagonist, used
in depression off-label
• Tandospirone – 5-HT1A receptor partial agonist
• Tianeptine – weak and atypical μ-opioid receptor agonist
• Minocycline – Microglia inhibitor
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
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27. EFFICACY OF ANTIDEPRESSANTS
• Strong evidence supports use of antidepressants in chronic
and severe depression.
• Conflicting results studies analysing the efficacy of
Antidepressants Vs Placebo in acute mild to moderate
depression.
• A metaanalysis of 21 clinical trials, published in Lancet, found
antidepressants to be more effective than placebo in major
depressive disorder in adults.
28-06-2020ANTI-DEPRESSANT DRUGS. Dr. Ashok Kumar Batham,M.D.,
27
28. LIMITATIONS OF ANTIDEPRESSANTS
• In clinical studies, approximately 1/3rd of patients
achieved full remission, 1/3rd experienced partial
response and 1/3rd turned out as non-responders.
• 30% - 50% of individuals treated with a given
antidepressant do not show a response.
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29. LONG TERM USE
• High relapse rate after conclusion of treatment.
• A meta-analysis of 31 placebo-controlled antidepressant trials
of 1-year treatment, in 2003, found that 18% of responders
relapsed during therapy and 41% patients switched-over to
Placebo relapsed.
• Therefore, pharmacotherapy for acute episode followed by
psychotherapy.
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31. AUGMENTATION & COMBINATION OF
ANTIDEPRESSANTS
American Psychiatric Association guidelines suggest
Adding a drug from another class with a different MoA,
and
Augmentation therapy with drugs like, Lithium, thyroxine,
dopamine agonists, sex steroids, NRIs, glucocorticoid-
specific agents, or the newer anticonvulsants and
psychostimulants.
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33. CHALLENGES IN THE USE OF ANTI-DEPRESSANTS
• Therapeutic “lag-period” - need for ECT, Deep Brain Stimulation,
Transmagnetic Brain Stimulation and supportive therapy during
this period
• Side-effects – need for proper counseling and management
• Switch-over phenomenon in case of Bipolar Depressive illness –
TCAs cause switch over to mania. SSRIs and Bupropion are less
likely to cause switch-over.
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34. CHALLENGES IN THE USE OF ANTI-DEPRESSANTS
• Suicidality (suicidal ideation, attempts, and successful suicide) -
Antidepressants have been incriminated in increasing suicidality
and a black-box warning to this effect led to an increased
incidence of suicidesstudy of 65,000 patients showed no increase
in suicides.
• It is recommended to weigh the risk of suicidality with treatment Vs
‘no-treatment’
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35. CHALLENGES IN THE USE OF ANTI-DEPRESSANTS
• Inadequate therapeutic response – 2/3rd patients show 50%
improvement in symptoms of depression over a period of 8-weeks
• Therapeutic strategy, if no response is obtained in 8-weeks with
adequate or maximum recommended dosage:
• Add-on a drug with a different MoA, e.g. SSRI to SNRI
• Add-on Bupropion
• Add-on triiodothyronine
• Add-on an atypical antipsychotics (aripiprazole or olanzapine)
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36. SEROTONIN SYNDROME
• Serious ADR reported with high doses, and in combination with
other drugs
• Rarely fatal
• Characterized by mania, restlessness, agitation, emotional
lability, insomnia and confusion
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37. HYPERTENSIVE CRISIS-CHEESE REACTION WITH MAO-INHIBITORS
• MAOIs. Can cause a serious, pronounced, and sometimes fatal
interactions with:
Certain drugs (sympathomimetics),
OTC medications for common cold containing nasal decongestants,
Foods containing very high levels of tyramine (mature cheese,
cured meats, or yeast extracts).
• Characterized by a potentially lethal hypertensive crisis.
• At lower doses an increased BP causing headache, giddiness, confusion,
agitation
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38. RISK OF SUICIDE
• Use of antidepressants is correlated with an increased risk of suicidal
behaviour and thinking (suicidality) in those aged under 25.
• US FDA - the heightened risk of suicidality is within the first one to two
months of treatment.
• NICE places the excess risk in the "early stages of treatment".
• No effect or possibly a mild protective effect in patients aged 25 to 64
years (OR=0.79).
• Protective effect against suicidality among those aged 65 and over
(OR=0.37).
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39. ANTI-DEPRESSANT-INDUCED MANIA
• Patients with bipolar disorder run the risk of getting antidepressant-
induced mania.
• Can occur in 20–40% of patients of bipolar disorder.
• Most often SSRIs can exacerbate or trigger symptoms of hypomania
and mania.
• Since many cases of bipolar depression are very similar to unipolar
depression, therefore, bipolar patient can be misdiagnosed and
exposed to the risk of precipitation of mania.
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40. EMOTIONAL BLUNTING
• Emotional blunting - both positive and negative can
occur.
• This may necessitate a dose reduction or change of
medication.
• The mechanism of this effect is unknown.
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41. EFFECTS ON BODY WEIGHT
• Body weight changes depend on the predominant effect
of antidepressant on neurotransmitters.
• Mirtazapine and paroxetine produce weight gain
and/or increased appetite.
• Fluoxetine, Bupropion and Venlafaxine cause weight loss
due to decreased appetite.
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42. ATROPINE-LIKE EFFECTS OF TCA
• Dryness of mouth
• Loss of sweating – interference with heat-regulating mechanisms
• Difficulty in near-vision and photophobia
• Tachycardia, palpitations
• Constipation
• Difficulty in micturition, particularly in presence of obstructive
uropathy, eg BPH
• Mental confusion, delirium
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43. SEXUAL SIDE EFFECTS
• Common with SSRIs, and include loss of sexual drive, failure to reach orgasm, and erectile
dysfunction.
• In a study of 1022 outpatients, overall sexual dysfunction with all antidepressants averaged
59.1%.
• MoA relating to effects of serotonin on 5-HT2 and 5-HT3 receptors; decreased dopamine;
decreased norepinephrine; blockade of cholinergic and α1-adrenergic receptors; inhibition of
nitric oxide synthetase; and elevation of prolactin levels.
• Moclobemide, a RIMA does not cause sexual dysfunction, and can actually lead to an
improvement in all aspects of sexual function.
• Mirtazapine is reported to have fewer sexual side-effects, most likely because it antagonizes 5-
HT2 and 5-HT3 receptors and may, in some cases, reverse sexual dysfunction induced by SSRIs
by the same mechanism.
• Bupropion, a weak NDRI and nicotinic antagonist, may be useful in treating reduced libido as a
result of SSRI treatment.
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44. SAFETY IN PREGNANCY
• Increased risk of spontaneous abortion of about 1.7-fold, preterm birth and low
birth weight with SSRIs.
• A study found a 27% increased risk of major malformations in SSRI exposed
pregnancies.
• Fluoxetine-exposure during pregnancies caused a 12% increase in the risk of
major malformations in a study.
• A systematic review and meta-analysis in 2013 could not show statistically
significant increased risk of major birth defects in antidepressant-exposed
pregnancies compared to non-exposed pregnancies.
• The FDA advises for the risk of birth defects with the use of paroxetine
• MAO-Is should be avoided.
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45. DISCONTINUATION SYNDROME
• Antidepressant discontinuation symptoms were first reported with
imipramine in the late 1950s, and similar reports appeared for
monoamine oxidase inhibitors (MAOIs), SSRIs, and SNRIs.
• By the year 2001, at least 21 different antidepressants, representing
all the major classes, were reported to cause discontinuation
syndromes mostly in case reports.
• Incidence is difficult to determine and controversial.
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