depression and newer antidepressants
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Depression and Newer Antidepressants. Ashraf B. Abdel-Naim Professor of Pharmacology and Toxicology Faculty of Pharmacy King Abdul Aziz University Jeddah, KSA. إِنَّا كُلَّ شَيْءٍ خَلَقْنَاهُ بِقَدَرٍ. بسم الله الرحمن الرحيم. سورة القمر – آية 49. What is a depressive disorder?. - PowerPoint PPT PresentationTRANSCRIPT
Depression and Newer Antidepressants
Ashraf B. Abdel-NaimProfessor of Pharmacology and Toxicology
Faculty of Pharmacy
King Abdul Aziz University
Jeddah, KSA
ء� ي� �ن�ا كل� ش� إ
د�ر� ن�اه ب�ق� ل�ق� خ�
بسم الله الرحمن الرحيم
49سورة القمر – آية
What is a depressive disorder?
• A depressive disorder is a syndrome that reflects a sad mood exceeding normal sadness or grief.
• Depression symptoms are also characterized by neurovegetative signs (irregular eating, sleeping, crying spells, and decreased libido).
Depressive disorders are a huge public health problem
• Direct and indirect costs • Depression causes significant problems more
often than do arthritis, hypertension, chronic lung disease, and diabetes.
• Depression increases the risks for developing HIV, coronary artery disease, and asthma.
• Depression is frequently under-diagnosed.• Depression is often under-treated.
Women and depression
• Women are twice as likely to become depressed as men.
• Postpartum depression
Types of depression• Major Depression
It is characterized by sad mood that interferes with the ability to work, sleep, eat, and enjoy once-pleasurable activities.
• Dysthymia
Dysthymia is a less severe type of depression. Chronic symptoms that do not disable, but prevent the affected person from functioning at "full steam".
• Bipolar Disorder (Manic Depression)
It involves cycles of depression and mania . The mood switches are sometimes dramatic and rapid, but most often they are gradual.
Symptoms of Depression• Persistently sad mood • Feelings of hopelessness, pessimism • Feelings of guilt, worthlessness, helplessness • Loss of interest in hobbies and activities that were once
enjoyed, including sex • Insomnia, or oversleeping • Decreased appetite or overeating• Fatigue, decreased energy• Persistent physical symptoms such as headache,
digestive disorders, and chronic pain• Thoughts of death or suicide
Symptoms of Mania
• Inappropriate elation • Inappropriate irritability • Severe insomnia • Grandiose notions • Increased talking speed and/or volume • Disconnected and racing thoughts • Markedly increased energy • Poor judgment • Inappropriate social behavior
What are the causes of depression?
• Genetic (especially with bipolar disorder)
• Stressful environment
Biochemical Basis of Depression
• The depressive disorders appear to be associated with low brain serotonin and norepinephrine.
I. Monoamine oxidase inhibitors (MAOIs)
• Phenelzine, Tanylcypromine (non-selective)
• Clorgyline, Moclobemide (MAO-A-
selective)
• Cheese Reaction
II. Tricyclic Antidepressants
• Imipramine, desipramine, amitriptyline, nortroptyline, amoxapine, doxipin
• Anticholinergic activity• Sexual dysfunction
• Cardiac toxicity• Orthostatic hypotension
III. Selective serotonin reuptake inhibitors (SSRIs)
• Fluoxetine (Prozac), fluvoxamine (Luvox), paroxetine (Paxil), sertraline (Zoloft), citalopram (Cipram)
• Little or no anticholinergic, alpha or histamine blocking activity.
• Decreased sexual desire (decreased libido), delayed orgasm
• Serotonergic syndrome
IV. Serotonin/norepinephrine reuptake inhibitors
• Venlafaxine (Effexor), duloxetine (Ariclaim)
• Venlafaxine is considered an SNRI, a serotonin and norepinephrine reuptake inhibitor.
• It has particularly robust effects.
• These drugs (SNRI) seem to be very promising, especially for the more severe and chronic cases of depression.
V. Atypical antidepressants
• Bupropion
• Mirtazapine
• Nefazodone & Trazodone
• Tianeptine (Stablon)
Bupropion
• It acts as norepinephrine and dopamine reuptake inhibitor
• Bupropion has been found to be effective as a smoking cessation aid.
Mirtazapine (Remeron)
• It is a tetracyclic compound. • It enhances serotonin and norepinephrine.• It is devoid of anticholinerigic, antiadrenergic or
serotonin-related side effects• Mirtazapine is given at bedtime and is often
prescribed for people who have trouble falling asleep.
Nefazodone and Trazodone
• These drugs are weak inhibitors of serotonin re-uptake.
• Their therapeutic benefit is related to their ability to block 5-HT1 presynaptic auto receptors and, thereby, increase serotonin release.
• Both agents are sedating, probably because of their potent H1-blocking activity.
Tianeptine (Stablon)
• Selective serotonin reuptake enhancer!
• Tianeptine acts to prevent and even reverse stress-induced neural damage, promoting both neuronal survival and synaptic plasticity.
VI. Mood Stabillizers
• Lithium
Other Mood-Stabilizing Drugs• Anticonvulsants: Valproate, Carbamazepine,
Gabapentin, and Lamotrigine
• Antipsychotics: Quetiapine, Risperidone
Non-Pharmacological Treatment of Depression (Psychotherapy)
• Talking therapies
• Interpersonal and cognitive/behavioral therapies
• Psychodynamic therapies
• Electroconvulsive therapy
Natural Products as Antidepressant
• Saint John's wort (Hypericum pefforatum)
• Most probably, it acts as a SSRI.
Self-help• Do not set difficult goals for yourself.
• Break large tasks into small ones.
• Do not expect too much from yourself too soon.
• Try to be with other people, which is usually better than being alone.
• Participate in activities that may make you feel better.
• Do not make major life decisions, such as changing jobs or getting married without consulting others who know you well.
• Do not accept your negative thinking.
Guidelines• In severe recurrent depressive illnesses, an
antidepressant (or ECT) along with psychotherapy are required for the best outcome.
• If a person suffers one major depressive episode, he or she has a 50% chance of a second episode.
• If the individual suffers two major depressive episodes, the chance of a third episode is 75 to 80%.
• If the person suffers three episodes, the likelihood of a fourth episode is 90 to 95%.
• After a second and certainly after a third episode, a patient should remain on a maintenance dosage of the medication.
• SSRIs are usually used initially because of their lower severity of side effects.
• Side effects of SSRI s can be minimized by starting tat low doses and gradually increasing the doses till full therapeutic effects.
• If SSRIs fail, antidepressants with dual action are to be tried.
• Other options include bupropion, which has action on dopamine.
• Sometimes a combination of antidepressants from different classes may be used.
• For MAOIs, take care of the cheese reaction.
• Alcoholic liquors reduce the effectiveness of antidepressants and should be avoided.
• Benzodiazepines are not antidepressants but they are occasionally prescribed with antidepressants for a brief period of anxiety. However, they should not be taken alone for depressive disorder.