Which category commonly abused drugs can cause decreased LOC and respiratory depression?

• A. Sedatives, Narcotics, And Barbiturates
• B. Inhalants
• C. Alcohol
• D. Stimulants

Answer: (A)

Central nervous system depressants slow brain activity and blunt the brain’s drive to breathe. Among the drugs most commonly abused that produce both a decreased level of consciousness and respiratory depression are sedatives, narcotics, and barbiturates. Narcotics (opioids) reduce the ventilatory response to carbon dioxide by acting on brainstem receptors, so breathing becomes slower and shallower, and consciousness can drop as a result of hypoxia and drug effect. Sedatives and barbiturates enhance GABA activity, quieting neural activity across the brain and diminishing the body’s normal response to CO2, which leads to deep sedation and increasingly shallow or paused breathing. These effects are especially dangerous when multiple depressants are used together, such as with alcohol. While other substances like inhalants or alcohol can depress respiration, the combination of decreased LOC and respiratory depression is most consistently associated with these central nervous system depressants.