Head-to-head evidence
Olanzapine (Zyprexa Relprevv) vs Quetiapine (Seroquel XR)
Same mechanism, same race: design-graded trial evidence for both assets, with the grading rationale shown. Grades describe the quality of the evidence, never the merits of either security.
Schizophrenia
Shared mechanism: Dopamine D2 and serotonin 5-HT2A receptors (antagonist) · full Schizophrenia pipeline
Olanzapine (Zyprexa Relprevv)
Marketed by Cheplapharm Arzneimittel GmbH and partners
NCT00088478 · Phase 3 · completed
This was a randomized, double-blind, placebo-controlled trial of 402 patients. All three tested doses of the long-acting olanzapine injection produced a significantly greater reduction in psychiatric symptom severity (PANSS) than placebo.
Next expected readout: December 2027 · NCT07047651 (registry estimate)
Quetiapine (Seroquel XR)
Marketed by Cheplapharm Arzneimittel GmbH and partners
NCT00640601 · Phase 3 · completed
This was a nonrandomized, single-group, open-label study of 295 treated participants, without a placebo or active comparator. Although 56.88% were reported to have improved clinical benefit on the primary CGI-CB measure, the uncontrolled design cannot determine how much of the improvement was due to quetiapine rather than other factors.
Next expected readout: February 2032 · NCT07152184 (registry estimate)
The full competitive landscape for each asset (every same-race competitor with aligned evidence, sortable) is on the asset pages: Olanzapine (Zyprexa Relprevv)'s landscape · Quetiapine (Seroquel XR)'s landscape