Diazepam belongs to which drug class?

• A. Barbiturate tranquilizer
• B. Benzodiazepine tranquilizer
• C. Dissociative anesthetic
• D. Opioid analgesic

Answer: (B)

Diazepam is a benzodiazepine tranquilizer. Benzodiazepines work by enhancing the inhibitory effect of GABA at the GABA-A receptor, increasing chloride ion influx and producing greater neuronal inhibition. This results in sedation, anxiolysis, muscle relaxation, and anticonvulsant effects, which is why diazepam is commonly used to calm animals, treat seizures, or prep for anesthesia. It’s not a barbiturate, even though both depress the CNS; benzodiazepines rely on GABA receptor modulation for their effect and generally have a safer safety profile, whereas barbiturates carry a higher risk of respiratory depression. It isn’t a dissociative anesthetic, which act through different mechanisms and create a dissociated state with analgesia. It’s also not an opioid analgesic, which provides pain relief primarily via opioid receptors. If needed, effects of benzodiazepines can be reversed with a specific antagonist like flumazenil.