"The oral dosage of pentobarbital indicated for physician-assisted suicide in Oregon is typically 10 g of liquid.[10][11]"

"A Swiss pharmacist reported in 2022 that the dose for assisted suicide had been raised to 15 grams because with lower doses in some cases death was preceded by a coma of up to 10 hours.[13]"

https://en.wikipedia.org/wiki/Pentobarbital

As J would say "little do good, more do better"

Further up that wiki

"It can also be used for short-term treatment of insomnia"