From the databaseWhat the row says.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
Scope
Supplement × Prescription
Last verified
June 4, 2026
CautionEmerging evidence
What is happening. Melatonin can add to prochlorperazine-related sedation, dizziness, and psychomotor impairment.
Mechanism. Additive central nervous system depressant effects.
Recommendation. Avoid combining before driving; use extra caution in older adults or fall-prone patients.
Stack Score
How it moves the number.
Effect on the composite score
If both Melatonin and Prochlorperazine are in the same stack, this pair applies −5 to your Stack Score (per scored caution row).
The full algorithm, the clamping rules, and four worked stacks are at /methodology/stack-score.
SourcesSources, by evidence tier.
Every claim on this page is cited. PMIDs link straight to PubMed.
Reference material
1- 1U.S. National Library of Medicine. Prochlorperazine Maleate Tablets US Prescribing Information. 2026.Needs sourceNo link