Medications for Bipolar Disorder
First-Line Treatment Selection
For acute mania or mixed episodes, start with lithium, valproate, or an atypical antipsychotic (aripiprazole, olanzapine, risperidone, quetiapine), with lithium showing superior long-term efficacy for maintenance therapy. 1
Acute Mania/Mixed Episodes
Lithium is FDA-approved for patients age 12 and older, with response rates of 38-62% in acute mania, and demonstrates superior evidence for preventing both manic and depressive episodes in long-term maintenance. 1
Valproate shows higher response rates (53%) compared to lithium (38%) in children and adolescents with mania and mixed episodes, and may be more effective for atypical forms including mixed-prevalence and rapid-cycling patterns. 1, 2
Atypical antipsychotics (aripiprazole, olanzapine, risperidone, quetiapine, ziprasidone) are approved for acute mania in adults and provide more rapid symptom control than mood stabilizers alone, though they require careful monitoring for metabolic side effects, particularly weight gain. 1
Combination therapy with lithium or valproate plus an atypical antipsychotic is indicated for severe presentations, with quetiapine plus valproate showing superior efficacy compared to valproate alone for adolescent mania. 1
Bipolar Depression
Olanzapine-fluoxetine combination is recommended as first-line treatment for bipolar depression. 1, 3, 4
Antidepressant monotherapy is contraindicated due to significant risk of mood destabilization, mania induction, and rapid cycling—antidepressants must always be combined with a mood stabilizer. 1, 3
Quetiapine monotherapy or as adjunctive treatment is recommended by most guidelines as a first-line choice for bipolar depression. 4, 5
Lamotrigine is recommended as first-line maintenance therapy and is particularly effective for preventing depressive episodes, though acute monotherapy studies have failed. 1, 4
Maintenance Therapy
Continue the regimen that effectively treated the acute episode for at least 12-24 months, with some patients requiring lifelong treatment when benefits outweigh risks. 1, 6
Lithium demonstrates superior evidence for prevention of both manic and depressive episodes in non-enriched trials and reduces suicide attempts 8.6-fold and completed suicides 9-fold. 1
Withdrawal of maintenance lithium therapy is associated with dramatically increased relapse risk, especially within 6 months following discontinuation, with more than 90% of noncompliant adolescents relapsing versus 37.5% of compliant patients. 1, 6
Quetiapine, aripiprazole, lamotrigine, valproate, and olanzapine are recommended first-line maintenance options alongside lithium. 4, 5
Medication-Specific Considerations
Lithium
- Target serum level: 0.8-1.2 mEq/L for acute treatment. 1
- Baseline monitoring: complete blood count, thyroid function tests, urinalysis, BUN, creatinine, serum calcium, pregnancy test in females. 1
- Ongoing monitoring: lithium levels, renal and thyroid function, urinalysis every 3-6 months. 1
- Best for: positive family history for bipolar disorder, mania-depression-interval pattern, few previous episodes, high suicide risk, no comorbidities. 7
Valproate
- Target therapeutic range: 50-100 μg/mL (some sources cite 40-90 μg/mL). 1
- Baseline monitoring: liver function tests, complete blood count, pregnancy test. 1
- Ongoing monitoring: serum drug levels, hepatic function, hematological indices every 3-6 months. 1
- Best for: many previous episodes/hospitalizations, psychiatric comorbidities, irritability and aggressive behaviors. 1, 7
Atypical Antipsychotics
Aripiprazole: 5-15 mg/day for acute mania, favorable metabolic profile. 1, 5
Olanzapine: 5-20 mg/day, rapid symptom control but significant metabolic risk. 1, 8, 5
Quetiapine: 300-600 mg/day, effective for both mania and depression but carries higher metabolic risk. 6, 4, 5
Risperidone: effective in combination with lithium or valproate. 1
Baseline metabolic monitoring: BMI, waist circumference, blood pressure, fasting glucose, fasting lipid panel. 1, 6
Follow-up: monthly BMI for 3 months then quarterly; blood pressure, glucose, lipids at 3 months then yearly. 1, 6
Critical Treatment Principles
Systematic medication trials require 6-8 weeks at adequate doses before concluding an agent is ineffective. 1, 6
Avoid unnecessary polypharmacy while recognizing that many patients will require more than one medication for optimal control. 1
Psychoeducation and psychosocial interventions (cognitive-behavioral therapy, family-focused therapy) should accompany all pharmacotherapy to improve outcomes. 1, 5
Common Pitfalls to Avoid
Antidepressant monotherapy can trigger manic episodes or rapid cycling. 1, 3
Inadequate duration of maintenance therapy leads to relapse rates exceeding 90% in noncompliant patients. 1, 6
Failure to monitor metabolic side effects of atypical antipsychotics, particularly weight gain, diabetes risk, and dyslipidemia. 1, 6
Premature discontinuation of effective medications without gradual tapering increases relapse risk. 1
Overlooking comorbidities such as substance use disorders, anxiety disorders, or ADHD that complicate treatment. 1