MARK ZAUSS - THERAPY
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Lithium

Lithium

Mechanism of Action
​
Lithium's exact mechanism of action remains not fully understood, but it is believed to work through several pathways:
  1. Neurotransmitter Modulation:
    • Enhances serotonergic activity and may reduce dopamine transmission.
    • Stabilizes mood by balancing excitatory and inhibitory neurotransmitters in the brain.
  2. Intracellular Signaling Pathways:
    • Inhibits inositol monophosphatase, leading to altered phosphatidylinositol signaling, which regulates mood and neuroplasticity.
    • Modulates glycogen synthase kinase-3 beta (GSK-3β), influencing cellular resilience and neuroprotection.
  3. Neuroprotective Effects:
    • Promotes the survival of neurons and enhances synaptic plasticity.
    • Reduces oxidative stress and may protect against neurodegeneration.
Sources:
  • Malhi et al., "Lithium: A Neuroprotective Agent" (PubMed)
  • NIH: Mechanisms of Action for Lithium
Picture
Clinical Benefits
  1. Mood Stabilization:
    • Effective in preventing manic and depressive episodes in bipolar disorder.
    • Considered the "gold standard" for long-term maintenance therapy.
  2. Acute Mania:
    • Reduces the intensity of manic symptoms, such as euphoria, hyperactivity, and irritability.
  3. Suicide Prevention:
    • Unique among mood stabilizers, lithium significantly reduces the risk of suicide in patients with mood disorders.
  4. Off-Label Uses:
    • May be used for treatment-resistant depression (as adjunct therapy).
    • Investigated for neurodegenerative diseases like Alzheimer's disease due to its neuroprotective properties.
Sources:
  • Goodwin & Jamison, "Bipolar Disorder: Lithium in Practice"
  • NICE Guidelines for Bipolar Disorder Treatment

Dosage
  1. Initial Dosing:
    • Typically starts at 300 mg to 600 mg daily, divided into two or three doses.
  2. Maintenance Dosing:
    • Adjusted based on serum lithium levels (therapeutic range: 0.6–1.2 mEq/L).
    • Typical maintenance doses range from 900 mg to 1,200 mg daily.
  3. Serum Monitoring:
    • Regular blood tests (every 1–3 months) are critical to ensure levels remain within the therapeutic range and avoid toxicity.
    • Target serum level for acute mania: 0.8–1.2 mEq/L.
Sources:
  • FDA Prescribing Information for Lithium
  • Clinical Psychiatry Guidelines

Prevalence of Side EffectsCommon Side Effects (10–30% of patients):
  • Gastrointestinal: Nausea, diarrhea, abdominal discomfort.
  • Neurological: Tremor, fatigue, cognitive slowing.
  • Weight Gain: Frequently reported with prolonged use.
  • Increased Thirst and Urination: Due to nephrogenic diabetes insipidus.
Serious Side Effects (less common):
  1. Thyroid Dysfunction:
    • Hypothyroidism occurs in ~10–20% of patients.
  2. Kidney Impairment:
    • Long-term use can affect renal function; regular monitoring of kidney function is essential.
  3. Lithium Toxicity:
    • Symptoms include confusion, severe tremor, ataxia, and seizures. Toxicity occurs at serum levels >1.5 mEq/L.
  4. Cardiac Effects:
    • Risk of arrhythmias, particularly in individuals with pre-existing cardiac conditions.
Sources:
  • BMJ: Lithium Monitoring and Side Effects
  • PubMed: Long-Term Safety of Lithium
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      • Methylphenidate
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      • Focalin (dexmethylphenidate)
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      • Onyda XR
      • Wellbutrin
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    • Insomnia
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