Drug interactions
Caffeine + Melatonin
Severity: Minor
Caffeine and Melatonin: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Caffeine is a stimulant that can oppose the sleep-promoting effect of melatonin. Caffeine may also modestly raise melatonin levels by inhibiting CYP1A2, but the clinical result is mainly reduced hypnotic benefit.
What this interaction means in plain words
Caffeine and Melatonin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Caffeine belongs to Miscellaneous; Melatonin belongs to Gastrointestinal Tract.
Why it happens
Pharmacodynamic antagonism by adenosine receptor blockade, with CYP1A2 inhibition by caffeine reducing melatonin clearance.
What to do
Avoid caffeine in the hours before the melatonin dose. No dose change is generally required.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Caffeine and Melatonin, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
Other interactions of Melatonin
- Fluvoxamine + Melatonin Major
- Alfentanil + Melatonin Moderate
- Belladonna and opium + Melatonin Moderate
- Buprenorphine buccal + Melatonin Moderate
- Butabarbital + Melatonin Moderate
- Butalbital + Melatonin Moderate
Other interactions of Caffeine
- Caffeine + Ephedrine Major
- Caffeine + Fezolinetant Major
- Caffeine + Methylenedioxymethamphetamine Major
- Caffeine + Selegiline transdermal Major
- Adenosine + Caffeine Moderate
- Benzphetamine + Caffeine Moderate
Frequently asked questions
Can I take Caffeine with Melatonin?
MediHelp rates the interaction as minor. Caffeine and Melatonin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Caffeine is a stimulant that can oppose the sleep-promoting effect of melatonin. Caffeine may also modestly raise melatonin levels by inhibiting CYP1A2, but the clinical result is mainly reduced hypnotic benefit.
How serious is the interaction between Caffeine and Melatonin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid caffeine in the hours before the melatonin dose. No dose change is generally required.
What other medicines interact with Melatonin?
MediHelp also lists interactions of Melatonin with, for example, Fluvoxamine, Alfentanil, Belladonna and opium. The full list is on the Melatonin page.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
