Lithium as Adjunctive Treatment for Bipolar 1 Depression with Suicidal Ideation

Evidence for Lithium's Anti-Suicidal Effects

Lithium is the most effective adjunctive treatment to add to Invega Sustenna for a bipolar 1 patient experiencing depression with suicidal ideation, as it significantly reduces suicide risk by 8.6-fold in bipolar disorder patients. 1
Lithium has demonstrated superior efficacy in reducing suicide risk in bipolar disorder patients, with evidence showing it significantly decreases both suicide attempts and completed suicides. 2
Patients with bipolar disorder are at 8.66 times higher risk of dying by suicide compared to the general population, making suicide prevention a critical treatment goal. 3, 4
Lithium's anti-suicidal properties appear to be independent of its mood-stabilizing effects, making it particularly valuable for patients with active suicidal ideation. 5

Lithium should be initiated with careful monitoring of blood levels, with baseline laboratory testing including complete blood count, thyroid function, urinalysis, BUN, creatinine, and serum calcium levels. 1
Careful third-party supervision is required for lithium prescriptions due to potential lethality in overdose. 1
Regular monitoring for suicidal ideation is essential, particularly when initiating or changing medications. 1
Premature discontinuation of lithium can lead to a 7-fold increase in suicide attempts. 1
The medication regimen that stabilizes acute symptoms should be maintained for at least 12-24 months. 1
Medication adherence must be closely monitored, as poor adherence significantly increases relapse risk. 1
Inadequate duration of medication trials before changing treatment approach (trials should be 6-8 weeks). 1

Lamotrigine is particularly effective for preventing depressive episodes in bipolar disorder and can be considered when depressive symptoms predominate. 1
Ketamine infusion (0.5 mg/kg) may provide rapid relief of suicidal ideation within 24 hours, with benefits lasting up to 1-6 weeks, though this should be considered a short-term intervention while other treatments take effect. 5
If an antidepressant is deemed necessary, it should always be combined with a mood stabilizer, with SSRIs preferred over tricyclic antidepressants due to their better safety profile in overdose. 1

Cognitive Behavioral Therapy (CBT) should be added to pharmacotherapy as it has been shown to reduce suicidal ideation, behavior, and hopelessness. 5
Family involvement is crucial to help restrict access to lethal means and to reinforce the importance of treatment adherence. 1
Psychoeducation should be routinely offered to both patients and family members to help identify early warning signs of mood episodes or suicidal thinking. 1

Ongoing assessment for substance use disorders is essential, as comorbid substance use can worsen bipolar symptoms and increase suicide risk. 4
Extended monitoring is recommended, particularly in the first year following hospital discharge, as this is a period of heightened suicide risk. 6