Mixing Melatonin and Tylenol PM
Low risk, increased effect
Low risk of harm, but the effects amplify each other. Doses that are fine alone can be far too much together.
Can you take Melatonin with Tylenol PM?
Tylenol PM contains acetaminophen and diphenhydramine. The most concerning part is Melatonin with Tylenol PM (Diphenhydramine): additive sedation. Both are used as sleep aids, and stacking them mostly adds next-day grogginess rather than benefit. MixSafe rates Melatonin with Tylenol PM as "Low risk, increased effect" — low risk of harm, but the effects amplify each other. Doses that are fine alone can be far too much together. Sources: the Drug Facts labels on DailyMed and MixSafe research. Educational information, not medical advice.
What is in it
- Tylenol PM
- Acetaminophen + Diphenhydramine.
Ingredient by ingredient
Melatonin + Tylenol PM (Diphenhydramine)Low risk, increased effect
Low risk of harm, but the effects amplify each other. Doses that are fine alone can be far too much together.
Additive sedation. Both are used as sleep aids, and stacking them mostly adds next-day grogginess rather than benefit.
Sources: Melatonin Interactions Checker. Drugs.com · Melatonin + Xanax: Can You Take Them Together? · Melatonin and SSRIs
Melatonin + Tylenol PM (Acetaminophen)Low risk, no synergy
Neither substance is expected to meaningfully change the other. Both still carry their own individual risks.
No specific interaction is documented. Acetaminophen's main risk is dose-dependent liver injury, so the thing to watch in any combination is total daily intake across all products (roughly 4g/24h) and anything else straining the liver.
Sources: Prescott LF. Paracetamol, alcohol and the liver. Br J Clin Pharmacol. 2000 · Acetaminophen: A Liver Killer or Thriller
- Tylenol PM Extra Strength, Drug Facts label. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=ce58105b-f010-47af-8f31-6dd4ce4e9cba
Ingredient lists checked 2026-09-27. Formulas change and store brands differ, so the Drug Facts box on your own packet is the final word.
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