Final answer:
Barbiturates like phenobarbital and pentobarbital have sedative effects and amides such as acetaminophen in Tylenol alleviate pain and fever.
Step-by-step explanation:
The question is about Barbiturates, which are a group of drugs derived from barbituric acid and possess sedative and hypnotic properties. These substances, including phenobarbital and pentobarbital, are often included in medications to induce sleep or reduce anxiety. On the other hand, amides such as phenacetin, and more commonly acetaminophen, are active ingredients found in over-the-counter medications like Tylenol. These amides are used to reduce fever and relieve pain, although they do not significantly affect inflammation.