Daily How Much

Diphenhydramine (Benadryl) sleep doses are usually 25–50 mg for adults, and it isn’t meant for nightly use.

Most adults use 25–50 mg diphenhydramine at bedtime for occasional sleeplessness, and the Drug Facts label sets the limit.

For many adults and teens 12+, diphenhydramine is taken in 25–50 mg doses every 4–6 hours, staying within the product’s 24-hour limit.

Most dogs are dosed at 1 mg of diphenhydramine per pound (2–4 mg/kg) every 8–12 hours, but some dogs shouldn’t get it at all.

A common diphenhydramine dose for a 75-lb dog is 68–136 mg per dose, and many veterinarians start near 75 mg.

A common vet dose is diphenhydramine 1 mg per lb (2–4 mg/kg) every 8–12 hours, using plain single-ingredient products only.

Most dogs start around 1 mg of diphenhydramine per pound of body weight, given every 8–12 hours, with a vet’s OK and the right product.

Most dogs get diphenhydramine at 1 mg per pound by mouth every 8–12 hours, using a plain product and a vet-approved plan.

Many vets use 2–4 mg/kg (about 0.9–1.8 mg/lb) of diphenhydramine every 8–12 hours, after checking the product’s ingredients.

For occasional sleeplessness, many adults use 25–50 mg of diphenhydramine at bedtime, then stop if they feel next-day fog or agitation.