What are barbiturates ? To which class of drugs do they belong ?

Explanation

**Step-by-Step Solution:**

1. **Definition of Barbiturates**:
Barbiturates are a class of drugs that are derived from barbituric acid. They are primarily used as central nervous system depressants.

2. **Functions of Barbiturates**:
- **Anti-depressants**: Barbiturates can help alleviate symptoms of depression.
- **Sleep-Inducing Agents**: They are commonly used to induce sleep in patients suffering from insomnia.
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