Which item is listed as a sedative?

Which item is listed as a sedative?

• A. Barbiturates
• B. Antihistamines
• C. Stimulants
• D. Antibiotics

Answer: (A)

Sedatives are substances that calm the nervous system, producing drowsiness or sleep. Barbiturates are a classic class of central nervous system depressants used specifically as sedatives and hypnotics. They work by enhancing GABA’s inhibitory effect in the brain, which slows neuronal activity and leads to calmness or sleep. Stimulants do the opposite by increasing brain activity and alertness, so they’re not sedatives. Antibiotics treat infections, not CNS activity. Some antihistamines can cause drowsiness, but they are primarily allergy medications, not classified as sedatives in the same way as barbiturates. Thus barbiturates are the item listed as a sedative.

Sedatives are substances that calm the nervous system, producing drowsiness or sleep. Barbiturates are a classic class of central nervous system depressants used specifically as sedatives and hypnotics. They work by enhancing GABA’s inhibitory effect in the brain, which slows neuronal activity and leads to calmness or sleep.

Stimulants do the opposite by increasing brain activity and alertness, so they’re not sedatives. Antibiotics treat infections, not CNS activity. Some antihistamines can cause drowsiness, but they are primarily allergy medications, not classified as sedatives in the same way as barbiturates. Thus barbiturates are the item listed as a sedative.