Seroquel vs. Zyprexa

See how Seroquel and Zyprexa compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Both Seroquel and Zyprexa are atypical antipsychotics approved for schizophrenia and bipolar I mania, and both carry a boxed warning against use in older adults with dementia-related psychosis.

  • Seroquel is taken once or twice daily and is FDA-approved by itself for bipolar depression, while Zyprexa is usually once daily and needs added fluoxetine to treat depression.

  • In trials, Zyprexa caused more sedation, weight gain, and akathisia, while Seroquel required a slower dose increase to avoid dizziness and low blood pressure.

Seroquel vs. Zyprexa Drug Summary

Seroquel

Seroquel (quetiapine) is an atypical antipsychotic used to treat schizophrenia, bipolar I mania, and bipolar depression, and it is used as an add-on for treatment-resistant depression. It comes as an oral tablet, usually started twice a day and raised gradually over the first several days to a target dose.

Zyprexa

Zyprexa (olanzapine) is an atypical antipsychotic used to treat schizophrenia and bipolar I disorder, including acute mania and maintenance treatment. It is taken as a tablet once daily, and a short-acting injection is available in the hospital for acute agitation.

Seroquel vs. Zyprexa Side Effects

Seroquel

Most common
Somnolence (up to 18%)
Dizziness (up to 11%)
Dry mouth (up to 9%)
Constipation (up to 8%)

Zyprexa

Most common
Somnolence (up to 52%)
Dizziness (up to 18%)
Akathisia (up to 27%)
Weight gain (common, 1-10%)

Seroquel vs. Zyprexa Dosage

Seroquel

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 25 mg twice daily Day 1
Maximum dose 300 mg once daily If needed
Dose changes 5 increases Every 3 days

Zyprexa

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 5-10 mg once daily At the start
Maximum dose 2.5-10 mg per IM dose If needed
Dose changes 4 increases As tolerated

Seroquel vs. Zyprexa Indications

Seroquel

Seroquel is FDA-approved for schizophrenia in adults and adolescents 13 and older, and for bipolar I mania, either alone or combined with lithium or valproate. It is also approved by itself for depressive episodes of bipolar disorder, and it is used off-label as an add-on for hard-to-treat major depression.

  • Schizophrenia (adults and adolescents 13-17)

  • Bipolar I mania, alone or with lithium/valproate

  • Bipolar depression, as a standalone treatment

  • Maintenance treatment of bipolar I disorder

  • Off-label: adjunct for treatment-resistant depression

Zyprexa

Zyprexa is FDA-approved for schizophrenia in adults and adolescents 13 to 17, and for bipolar I mania, either alone or combined with lithium or valproate. It also treats acute agitation tied to those conditions, and when paired with fluoxetine, it treats bipolar depression and treatment-resistant depression.

  • Schizophrenia (adults and adolescents 13-17)

  • Bipolar I mania, alone or with lithium/valproate

  • Maintenance treatment of bipolar I disorder

  • Acute agitation, short-acting injection

  • With fluoxetine: bipolar and resistant depression

Seroquel vs. Zyprexa Pros and Cons

Seroquel

Quetiapine's sedating effect can help patients whose insomnia or anxiety complicates their psychiatric symptoms, and it is FDA-approved on its own for bipolar depression, unlike olanzapine. As a decades-old generic, it is usually inexpensive, though it still carries the same class-wide metabolic warnings as other atypical antipsychotics.

Pros

  • FDA-approved alone for bipolar depression, no second drug needed

  • Roughly $10 to $150 a month for generic quetiapine, before insurance

  • Sedating effect can help co-occurring insomnia or anxiety

  • Lower reported rate of akathisia than olanzapine

Cons

  • Multi-day dose titration needed to limit dizziness and low blood pressure

  • Often dosed twice a day during initial treatment

  • Sedation and dry mouth are among its most common side effects

Zyprexa

Olanzapine has one of the longest track records among atypical antipsychotics and offers a rapid-acting injection for acute agitation in the hospital. Its once-daily maintenance dosing is simple, but it carries a stronger metabolic burden and a higher brand list price than generic quetiapine.

Pros

  • Simple once-daily dosing once a maintenance dose is set

  • Short-acting IM injection available for acute agitation

  • Long-acting injectable option (Relprevv) exists for extended dosing intervals

  • Decades of real-world use since its 1996 approval

Cons

  • Higher rates of weight gain and sedation than many atypical antipsychotics

  • Akathisia reported more often than with quetiapine

  • Roughly $440 to $900 a month without insurance, well above generic quetiapine

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