Combination
Mixing Acetaminophen and Diphenhydramine
AnalgesicDeliriant
- Acetaminophen also called
- tylenol, paracetamol, apap, panadol
- Diphenhydramine also called
- benadryl, dph, sleep aid, zzzquil, unisom
Verdict
Low risk, no synergy
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.
Can you mix Acetaminophen and Diphenhydramine?
Neither substance is expected to meaningfully change the other. Both still carry their own individual risks.
- Prescott LF. Paracetamol, alcohol and the liver. Br J Clin Pharmacol. 2000. https://pubmed.ncbi.nlm.nih.gov/10759684/
- Acetaminophen: A Liver Killer or Thriller. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10645398/
Checking more than two?
Combinations of three or more carry risks that no pair-by-pair chart can show. The checker rates every pair at once and flags the whole-mix ones on top.
Open this in the checkerRelated combinations
Diphenhydramine withWhat not to mix with Diphenhydramine →
Rated low / no synergy. Educational information only, not medical advice. Absence of a documented interaction is not evidence of safety.