What fentanyl IV infusion rates provide ICU analgesia?

Fentanyl IV infusion for ICU analgesia: 25 to 200 mcg/h (0.7 to 3 mcg/kg/h). Bolus dosing: 0.35 to 1.5 mcg/kg IV. Fentanyl preferred in hemodynamic instability (less histamine release than morphine), renal failure (no active metabolite accumulation), and when rapid titration is needed (short context-sensitive half-time at low doses).

When does fentanyl context-sensitive half-time increase dangerously?

Fentanyl context-sensitive half-time increases significantly with prolonged infusion (>12 hours at high doses): from 15 min (short infusion) to 300+ min (multi-day ICU infusion). This makes weaning difficult in prolonged ICU stays. Remifentanil is preferred when rapid offset needed regardless of infusion duration (t1/2 alpha 3 to 5 min, ester hydrolysis).

Fentanyl Equianalgesic ICU Dosing Calculator

Calculate fentanyl continuous infusion rates equivalent to other opioids for ICU analgesia, with dose titration based on CPOT/NRS scores and conversion between IV morphine, hydromorphone, and fentanyl patch.

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Fentanyl Equianalgesic ICU Dosing Calculator

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Frequently Asked Questions

What fentanyl IV infusion rates provide ICU analgesia?

When does fentanyl context-sensitive half-time increase dangerously?