noun. a long-acting barbiturate used as a sedative.
- sodium thiopental
- purple heart
Example sentences of the word phenobarbital
1. Noun, singular or mass
If the level is low, your dog may be hypothyroid or the level may have been lowered by a concurrent illness or certain medications such as phenobarbital.
If phenobarbital is not working well on its own, your vet may prescribe potassium bromide in addition to the phenobarbital.