Which hormone can exaggerate certain drug effects and increase the risk of overdose in patients having a Cesarean delivery?

Which hormone can exaggerate certain drug effects and increase the risk of overdose in patients having a Cesarean delivery?

• A. Progesterone
• B. Estrogen
• C. Oxytocin
• D. Prolactin

Answer: (A)

Progesterone and its metabolites have a direct effect on central nervous system sensitivity to drugs. In late pregnancy, substances like allopregnanolone, a metabolite of progesterone, enhance GABA-A receptor activity. This increases inhibitory neurotransmission, making sedatives, opioids, and other anesthetic agents act more strongly than usual. As a result, the same dose can produce greater sedation and respiratory depression, raising the risk of overdose during a cesarean delivery when these medications are commonly used. Clinically, this means dosing must be approached more cautiously in pregnant patients—lower initial doses and careful titration of opioids and sedatives, with vigilant monitoring of respiration and oxygenation. Multimodal anesthesia/analgesia strategies can help minimize reliance on single agents. The other hormones listed do not have this same pronounced effect on enhancing CNS depressant drug actions in this obstetric context, which is why progesterone is the best answer.

Progesterone and its metabolites have a direct effect on central nervous system sensitivity to drugs. In late pregnancy, substances like allopregnanolone, a metabolite of progesterone, enhance GABA-A receptor activity. This increases inhibitory neurotransmission, making sedatives, opioids, and other anesthetic agents act more strongly than usual. As a result, the same dose can produce greater sedation and respiratory depression, raising the risk of overdose during a cesarean delivery when these medications are commonly used.

Clinically, this means dosing must be approached more cautiously in pregnant patients—lower initial doses and careful titration of opioids and sedatives, with vigilant monitoring of respiration and oxygenation. Multimodal anesthesia/analgesia strategies can help minimize reliance on single agents. The other hormones listed do not have this same pronounced effect on enhancing CNS depressant drug actions in this obstetric context, which is why progesterone is the best answer.