Diphenhydramine

Half-life: 8.4 hours
Median half-life: 4.3 hours
Volume of distribution: 4.5 L/kg
Clearance rate: 6.2 mL/min/kg
Tmax (oral): 2.3 hours
Absorption half-life: 33 minutes
Oral bioavailability: 72%


Half-life varies by age:

  • young males: 4.1 hours
  • elderly males: 7.4 hours
  • young females: 4.4 hours
  • elderly females: 4.9 hours

Source:
  • https://pubmed.ncbi.nlm.nih.gov/3760245/
  • https://accp1.onlinelibrary.wiley.com/doi/10.1002/j.1552-4604.1998.tb04466.x
  • https://en.wikipedia.org/wiki/Diphenhydramine

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