Olanzapine Dose Comparison for the Prevention of HER-INV: A Network Meta-Analysis

Summary

Olanzapine is an effective antiemetic agent for preventing highly emetogenic regimens-induced nausea and vomiting (HER-INV) in patients receiving highly emetogenic regimens (HER). The optimal dose remains debated, with the standard 10 mg dose often causing significant daytime sedation. Recent evidence suggests that lower doses (2.5 mg and 5 mg) may offer comparable efficacy with improved tolerability. However, no head-to-head randomized controlled trials (RCTs) directly compare all three doses.

Eligibility

Inclusion Criteria:

1. Olanzapine was used to prevent nausea and vomiting (HER-INV) in solid tumors patients receiving highly emetogenic regimens.
2. Randomized controlled trials (RCTs), including conference abstracts if sufficient data are provided.
3. Adult patients (≥18 years) with solid tumors receiving highly emetogenic chemotherapy (HEC).

3\. Olanzapine at 2.5 mg, 5 mg, or 10 mg, added to a standard triple antiemetic regimen (NK1 receptor antagonist + 5-HT3 receptor antagonist + dexamethasone).

4\. Any of the other three olanzapine doses or placebo (2.5 mg vs. 5 mg vs. 10 mg, or vs. placebo).

5\. At least one of the pre-specified efficacy or safety outcomes must be reported.

Exclusion Criteria:

1. Non-solid tumors patients, non-randomized studies, observational studies, case reports, reviews.
2. Studies involving pediatric populations, non-HEC regimens.
3. Studies where olanzapine is used as rescue medication only. Studies with overlapping patient populations (the most recent or complete publication will be selected).

Conditions4

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