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 may add to fatigue or somnolence in patients who are sensitive to desloratadine.
Mechanism. Potential additive sedative effect.
Recommendation. Use cautiously until individual alertness is known, especially with driving or fall risk.
Stack Score
How it moves the number.
Effect on the composite score
If both Desloratadine and Melatonin 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. Desloratadine Tablets US Prescribing Information. 2026.Needs sourceNo link