Supplement × Prescription·a caution·Emerging evidence
Melatonin can add to levocetirizine-related somnolence and next-day impairment.
Every entry follows the same shape: what is happening, the mechanism, and the recommendation.
What is happening. Melatonin can add to levocetirizine-related somnolence and next-day impairment.
Mechanism. Additive sedating effects.
Recommendation. Use cautiously, especially when driving, working at heights, or caring for dependents overnight.
Effect on the composite score
If both Levocetirizine 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.
Every claim on this page is cited. PMIDs link straight to PubMed.
Check your full routine
Drop your supplements and prescriptions into NutriStack and it runs every pair at once: every interaction, synergy, timing rule, and contraindication, each linked to its primary source.
NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.
NutriStack