Depressants, also known as downers, are a class of drugs that slow down the body's functions and reduce alertness. They are commonly used to treat anxiety, insomnia, and other mental health issues. Common depressants include alcohol, benzodiazepines, barbiturates, and opioids. These drugs can be highly addictive and have serious side effects, including drowsiness, confusion, and impaired coordination. Long-term use can lead to physical and psychological dependence.