Decreased alertness slurred speech drowsiness and depressed respiration are common side effects of .?

Decreased alertness, slurred speech, drowsiness, and depressed respiration are common side effects of central nervous system (CNS) depressants, including opioids, benzodiazepines, and alcohol. These substances can impair brain function and respiratory drive, leading to potentially dangerous effects. It is important to use these medications under strict medical supervision to minimize risks.