Final answer:
Phenobarbital is a Schedule III controlled substance that falls under the category of barbiturates, known for their sedative effects.
Explanation:
Phenobarbital is a Schedule III controlled substance. It belongs to the group of barbiturates, which are depressants commonly prescribed as sleeping pills and painkillers. These drugs can produce relaxation and sleepiness but can lead to serious symptoms at higher doses, including coma and death.
Learn more about Controlled Substances here:
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