Sedatives & Hypnotics: Classification, Mechanism, Uses & Side Effects

📌 Introduction  

Sedatives and hypnotics are central nervous system (CNS) depressant drugs used to reduce anxiety and induce sleep. They are commonly used in clinical practice and frequently asked in pharmacy exams like GPAT and DSSSB.

🔍What are Sedatives & Hypnotics?  

• Sedatives → reduce anxiety and calm the patient  

• Hypnotics → induce sleep

At lower doses → sedative effect  

At higher doses → hypnotic effect

📝 Classification  

• Benzodiazepines  

Examples: Diazepam, Lorazepam

• Barbiturates  

Examples: Phenobarbital

• Non-benzodiazepines  

Examples: Zolpidem

🧬 Mechanism of Action

These drugs enhance the effect of GABA (inhibitory neurotransmitter):

• Increase GABA activity  

• Cause CNS depression

• Produce calming and sleep-inducing effect

🩺 Pharmacological Effects  

• Reduce anxiety  

• Induce sleep

• Muscle relaxation

• Anticonvulsant effect

💊 Therapeutic Uses

Used in:

• Insomnia

• Anxiety disorders

• Epilepsy

• Preoperative sedation

🚨 Side Effects

• Drowsiness

• Confusion

• Dependence

• Respiratory depression (high doses) 

📑 Important Exam Points

• Benzodiazepines → safer than barbiturates

• Diazepam → widely used

• Zolpidem → non-benzodiazepine hypnotic

• Act via GABA receptor

🛑 Precautions

• Avoid alcohol

• Use carefully in elderly

• Risk of dependence

🎯 Conclusion

Sedatives and hypnotics are important CNS drugs used for anxiety and sleep disorders. Understanding their classification, mechanism, and uses is essential for exams.

👉 Practice MCQs in evening post