Depression Management

Depression Management

Pharmacotherapy:

• 50 to 70% effective

Selection factors:

• ➢ Prior response to agent
• ➢ Anticipated side effects
• ➢ Concomitant illness
• ➢ Potential for drug interactions
• ➢ Family history of response
• ➢ Patient desire
• ➢ Cost

Serotonin and SSRIs

• A class of drugs that inhibit the uptake of serotonin so increases synaptic serotonin levels.
• Many SSRIs affect other receptors especially at higher doses.
• Several serotonin (5-HT) receptors subtypes.
• The different response we notice in some patients with one antidepressant versus another because they are structurally unrelated and different response related to different morphology of serotonin transport protein.

Middleton et al: BMJ (2005)

SSRIs

• Fluoxetine : 1988
• Sertraline : 1992
• Paroxetine : 1993
• Fluvoxamine : 1994
• Citalopram : 1998
• S. Citalopram : 2002

SNRIs

• Desvenlafaxine, duloxetine, venlafaxine

Norepinephrine-Serotonin Modulator

NASA

• Mirtazapine

Antidepressants: GuidelinesY

• CANMAT (first-line recommendations)

  • SNRIs
    • Desvenlafaxine, duloxetine, venlafaxine
  • SSRIs
    • Citalopram, escitalopram, fluoxetine, fluvoxamine, paroxetine, sertraline
  • TCAs
    • N/A
  • Serotonin modulators
    • N/A
  • Norepinephrine-serotonin modulator
    • Mirtazapine
  • MAOIs
    • Moclobemide
  • DNRI
    • Bupropion

• APA (Level 1= recommended with substantial clinical confidence)

  • SNRIs
    • Desvenlafaxine, duloxetine, venlafaxine
  • SSRIs
    • Citalopram, escitalopram, fluoxetine, fluvoxamine, paroxetine, sertraline
  • TCAs
    • Amitriptyline, doxepin, imipramine, nortriptyline, protriptyline, maprotiline, trimipramine
  • Serotonin modulators
    • Nefazodone, trazodone
  • Norepinephrine-serotonin modulator
    • Mirtazapine
  • MAOIs
    • Isocarboxazid, moclobemide, phenelzine, selegiline, tranylcypromine
  • DNRI
    • Bupropion

APA = American Psychiatric Association; CANMAT = Canadian Network for Mood and Anxiety Treatments; TCA = tricyclic antidepressant; N/A = not applicable; MAOI = monoamine oxidase inhibitor; DNRI = dopamine norepinephrine reuptake inhibitor
Gelenberg et al., 2010. Practice Guideline for the Treatment of Patients with Major Depressive Disorder. Third Edition. Available at APA Guidelines; Lam RW et al. J Affect Disord. 2009;117(Suppl 1):S26-S43.

Principles of Prescribing in Depression

• Discuss with the patient choice of drug and utility/availability of other, non-pharmacological treatments.
• Discuss with the patient likely outcomes, such as gradual relief from depressive symptoms over several weeks.
• Prescribe a dose of antidepressant (after titration, if necessary) that is likely to be effective.
• For a single episode, continue treatment for at least 6-9 months after resolution of symptoms (multiple episodes may require longer).
• Withdraw antidepressants gradually; always inform patients of the risk and nature of discontinuation symptoms.

Summary of NICE Guidance: Treatment for Depression

• Antidepressants are not recommended as a first-line treatment in recent-onset, mild depression; active monitoring, individual guided self-help, CBT and/or exercise are preferred.
• Antidepressants are recommended for the treatment of moderate-to-severe depression and for dysthymia.
• When an antidepressant is prescribed, a selective serotonin reuptake inhibitor (SSRI) is recommended.
• All patients should be informed about the withdrawal (discontinuation) effects of antidepressants.
• For treatment-resistant depression, recommended strategies include:Z
  1. Augmentation with lithium or an antipsychotic
  2. The addition of a second antidepressant.
• Patients with two prior episodes and functional impairment should be treated for at least 2 years.
• The use of ECT is supported in severe and treatment-resistant depression.

Selective Serotonin Reuptake Inhibitors: Summary of Suggested Treatment

• Use of the lowest possible dose
• Monitor closely in early stages for restlessness, agitation and suicidality. This is particularly important in young people (<30 years).
• Doses should be tapered gradually on stopping.

Key Points That Patients Should Know About Depression

• A single episode of depression should be treated for at least 6-9 months after remission.
• The risk of recurrence of depressive illness is high and increases with each episode.
• Those who have had multiple episodes may require treatment for many years.
• The chances of staying well are greatly increased by taking antidepressants.
• Antidepressants are:
  • Effective
  • Not addictive
  • Not known to lose their efficacy over time
  • Not known to cause new long-term side effects.
• Medications need to be continued at the treatment dose. If side effects are intolerable, it may be possible to find a more suitable alternative.
• If patients decide to stop their medication, this must not be done abruptly, as this may lead to unpleasant discontinuation effects and confers a higher risk of relapse. The medication needs to be reduced slowly under the supervision of a doctor.

The World Health Organisation figures from 1997 show that the number of reported deaths from suicide is high compared to more high-profile causes of death. The actual figure is likely to be much higher as many suicides are not reported. According to the WHO figures for some countries, such as Mexico, do not even report death by suicides. This indicates a discrepancy in the way mortality figures are reported.