Moderate
Established
Mô tả
IV morphine delays and reduces the absorption of oral clopidogrel in acute coronary syndrome patients, potentially providing inadequate antiplatelet coverage during a critical window.
Cơ chế
Opioids slow gastric emptying via mu-receptor stimulation, delaying the transit of clopidogrel to its intestinal absorption site and reducing peak plasma concentrations and platelet inhibition.
Ý nghĩa lâm sàng
Pharmacokinetic studies in STEMI patients show that morphine reduces clopidogrel Cmax by ~34% and delays Tmax by ~1–2 hours.
Xử trí
Consider using ticagrelor (which is less affected by morphine) instead of clopidogrel in ACS patients requiring opioid analgesia; or administer a crushed clopidogrel loading dose to partially mitigate the delay.