How to Start a Norepinephrine Drip
Norepinephrine is the first-choice vasopressor for septic shock and should be started immediately after adequate fluid resuscitation, targeting a mean arterial pressure (MAP) of 65 mmHg. 1, 2
Preparation and Dilution
Standard concentration: Add 4 mg (one 4 mL vial) of norepinephrine to 1,000 mL of 5% dextrose solution to yield 4 mcg/mL 3
- Must dilute in dextrose-containing solutions (D5W or D5NS) - dextrose protects against oxidation and potency loss
- Do NOT use saline alone as the diluent 3
- Alternative concentration for pump use: 1 mg in 100 mL saline yields 10 mcg/mL (easier for titration)
Access and Administration
Preferred Route: Central Venous Access
- Insert a plastic IV catheter through a large bore needle, advanced centrally into the vein 3
- Secure with adhesive tape; avoid tie-in techniques that promote stasis
- Essential equipment: IV drip chamber or metering device for accurate flow rate monitoring 3
Peripheral Administration (When Central Access Delayed)
Peripheral norepinephrine is safe when following strict protocols - this can avoid central line placement in 50% of patients 4
Protocol requirements for peripheral use:
- 18-gauge or larger catheter 5
- Site: At or above the antecubital fossa, or external jugular vein 5
- Maximum dose: 20 mcg/min peripherally 5
- Maximum duration: Less than 24 hours 6, 4
- Monitoring: Visual inspection and evaluation every 2 hours 6
- Extravasation rate: 2-4.5% with protocol adherence, minimal tissue injury when treated promptly 6, 5, 7
Critical caveat: Peripheral administration should be viewed as a bridge to central access or for short-duration use only. The extravasation risk, while low with protocols, can cause tissue injury if not monitored meticulously.
Initial Dosing
Starting dose: 2-3 mL/min of the standard dilution (8-12 mcg/min) 3
Alternative dosing approach:
- Start at 0.5-1 mL/min (2-4 mcg/min) and titrate upward 3
- Using an infusion pump: 30-100 mL/h (5-15 mcg/min) of the 1:100,000 solution 8
Titration and Monitoring
- In previously hypertensive patients, raise BP no higher than 40 mmHg below pre-existing systolic pressure 3
Maintenance dosing:
- Average: 2-4 mcg/min (0.5-1 mL/min of standard dilution) 3
- Range: Can titrate from 1-4 mcg/min up to maximum 10 mcg/min 8
- High doses (up to 68 mg/day or 17 vials) occasionally necessary, but always suspect occult blood volume depletion at high doses 3
Essential monitoring:
- Arterial catheter placement as soon as practical 1, 2
- Continuous hemodynamic monitoring in ICU setting 8
- If invasive monitoring unavailable: every-minute BP and pulse measurements plus ECG monitoring 8
Critical Pre-requisites
Before starting norepinephrine:
Fluid resuscitation first: Minimum 30 mL/kg crystalloids (normal saline preferred) 2
Concurrent supportive measures:
Exception: In emergency situations where cerebral or coronary ischemia is imminent, norepinephrine can be started before complete volume resuscitation, but fluid replacement must continue concurrently 3
Extravasation Management
If extravasation occurs:
- Phentolamine: 0.1-0.2 mg/kg (up to 10 mg) diluted in 10 mL normal saline, injected intradermally at extravasation site 9, 7
- Plus nitroglycerin paste applied locally 7
- This combination effectively prevents local ischemic injury 7
When to Add Additional Agents
If MAP target not achieved with norepinephrine alone:
- Add vasopressin 0.03 units/min (not as sole initial agent) 1, 2
- Or add epinephrine (weak recommendation) 1, 2
- Avoid dopamine except in highly selected patients with bradycardia and low tachyarrhythmia risk 1, 2
Common pitfall: Do not use low-dose dopamine for "renal protection" - this is ineffective and not recommended 1, 2