Daily How Much

Many vets use diphenhydramine at 1 mg per pound per dose, spaced 8–12 hours apart, after checking your dog’s meds and health history.

Plain diphenhydramine is often used at about 1 mg per pound per dose, given every 8–12 hours, after your veterinarian OKs it for your dog.

For a 70-lb dog, a common diphenhydramine dose is 70 mg per dose, given every 8–12 hours when your vet says it fits.

Typical diphenhydramine dosing is 2–4 mg/kg every 8–12 hours, and drowsiness can happen.

A 50-lb dog is commonly given 25–50 mg diphenhydramine per dose every 8–12 hours, but the right amount depends on your dog’s health and the product.

An 80-lb dog often lands around 75–80 mg of plain diphenhydramine per dose, every 8–12 hours, after your veterinarian okays it.

Children’s diphenhydramine dosing is usually weight-based, spaced 6–8 hours apart, and many kids under 6 should use it only with a clinician’s OK.

A common at-home target dose is 1 mg of plain diphenhydramine per pound per dose, so a 90 lb dog often lands near 90 mg per dose.

Many vets start at 1 mg per lb (2–4 mg/kg) every 8–12 hours, yet your vet should set the exact dose for your dog.

A typical single dose for a 75-pound dog is about 75 mg of plain diphenhydramine, often given every 8–12 hours if a veterinarian says it fits your dog.