Is Melatonin Safe with Olanzapine?
Free · No account · based on published sources including NIH ODS, FDA drug labels, and peer-reviewed literature
Use melatonin cautiously and only under medical supervision. Start with the lowest dose possible and avoid activities requiring alertness the following morning. Report unusual sedation or confusion to your healthcare provider.
Why this interaction occurs
Olanzapine is a potent H1 antagonist with strong sedative effects and also affects circadian rhythm regulation via dopamine and serotonin pathways. Adding exogenous melatonin may cause additive sedation and alter circadian signaling unpredictably. Olanzapine is also metabolized by CYP1A2, and melatonin shares this pathway, creating potential for competitive metabolism and elevated plasma levels of both agents.
Evidence
Evidence level: moderate.
Reported safety data
The FDA’s adverse event reporting system (FAERS) has received 71,098 reports mentioning Olanzapine. This reflects reported cases involving the medication in general — not confirmed causation, and not specific to the Olanzapine + supplement combination on this page.
FAERS reports are voluntary and cannot prove that a drug caused an event. Do not use report counts to assess the safety of this specific drug-supplement pair.
Frequently asked questions
Related interactions
All Melatonin interactions → · All Olanzapine interactions →
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Educational only — not medical advice.
Always confirm with your doctor or pharmacist.