Which class of medications should be avoided in COPD due to risk of respiratory depression?

• A. Antihistamines
• B. Sedatives such as narcotics and benzodiazepines
• C. Statins
• D. Antibiotics

Answer: (B)

In COPD, medications that slow the respiratory center and blunt the drive to breathe can be dangerous. Sedatives such as narcotics (opioids) and benzodiazepines depress the medullary respiratory centers and reduce the body's response to hypoxemia and hypercapnia. For someone with COPD, who already has compromised gas exchange and may rely more on hypoxic stimulation to breathe, this can lead to significant hypoventilation, CO2 retention, and even respiratory failure. That’s why this class is avoided in COPD unless absolutely necessary, and then only with careful monitoring, lowest effective dosing, and close observation of breathing and oxygenation.

Other options don’t carry the same risk of depressing respiration to the same extent. Antihistamines can cause some drowsiness but are not primarily respiratory depressants in the context of COPD. Statins and antibiotics do not affect the respiratory drive in the way sedatives do.

In practice, if pain relief or anxiety management is needed in COPD, non-sedating or minimally sedating options are preferred, and if a sedative is unavoidable, use the smallest dose for the shortest duration with vigilant monitoring.