An epinephrine drip is prepared by diluting epinephrine into an IV bag of normal saline or 5% dextrose to create a precise, low concentration that can be infused continuously through a pump. The two most common standardized concentrations for adults are 20 mcg/mL and 40 mcg/mL, deliberately chosen to differ from norepinephrine concentrations and reduce the risk of mix-ups.
Standard Adult Concentrations
The American Society of Health-System Pharmacists recognizes two standard adult concentrations for continuous epinephrine infusions: 20 mcg/mL and 40 mcg/mL. These are dosed in mcg/kg/min and titrated to effect. The source vial is typically 1 mg/mL (sometimes labeled 1:1,000) or a 30 mg/30 mL multidose vial.
To make a 20 mcg/mL solution, you add 5 mg of epinephrine (5 mL from a 1 mg/mL vial) to a 250 mL bag, yielding 5,000 mcg in 250 mL. For 40 mcg/mL, double it: 10 mg into 250 mL. Some facilities use a simpler “4 mg in 250 mL” formulation (16 mcg/mL), which is common in older protocols and pediatric weight ranges above 50 kg. Whatever your institution’s standard, the math follows the same pattern: total drug in micrograms divided by total volume in milliliters equals your final concentration.
Carrier Fluid Selection
Epinephrine is compatible with both normal saline (0.9% sodium chloride) and 5% dextrose in water. Some references, including StatPearls, specifically recommend diluting in a dextrose solution for septic shock indications. In practice, both carriers maintain drug stability. Stability studies show epinephrine retains over 95% of its original concentration for at least 30 days in either normal saline or dextrose bags stored at room temperature or refrigerated, with no notable changes in color, pH, or precipitation.
If you’re premixing bags in advance, wrapping them in amber light-blocking bags extends usable shelf life. One study in Hospital Pharmacy found that epinephrine in normal saline bags stored in amber UV-blocking bags remained stable (less than 10% degradation) for up to 45 days at room temperature and 60 days refrigerated, at both 16 mcg/mL and 64 mcg/mL concentrations.
Pediatric Drip Concentrations
Pediatric mixing is weight-stratified. UMass Memorial guidelines break it into three tiers:
- Under 10 kg: 8 mg in 250 mL
- 10 to 50 kg: 16 mg in 250 mL
- Over 50 kg: 4 mg in 250 mL
The maximum concentration is 16 mg in 250 mL (64 mcg/mL). Pediatric infusions typically run at 0.1 to 1 mcg/kg/min, titrated to the desired hemodynamic response. A central line is preferred for delivery.
Push-Dose Epinephrine as a Bridge
When a patient’s blood pressure is crashing and you don’t have time to mix a full drip, push-dose epinephrine provides a rapid bridge. The goal is a 10 mcg/mL concentration you can give in small, controlled boluses.
To prepare it: start with a 10 mL syringe containing 9 mL of normal saline. Draw up 1 mL from a cardiac epinephrine ampule (the prefilled 10 mL amp at 100 mcg/mL, also labeled 1:10,000). Shake well. You now have 10 mL at a concentration of 10 mcg/mL. Each 1 mL push delivers 10 mcg. An alternative approach, described by emergency physician Sam Ghali, is to place a full 1 mg vial of 1:1,000 epinephrine directly into a 100 mL normal saline bag, giving the same 10 mcg/mL concentration you can draw from with a syringe. Tape the bag in red to make it visually distinct.
Push-dose epi is a temporizing measure. It buys minutes while the continuous drip is being mixed and connected to a pump.
How Epinephrine Behaves at Different Doses
Epinephrine activates different receptors depending on the infusion rate. At lower doses, it primarily stimulates the heart’s beta receptors, increasing heart rate and the force of each contraction. As the dose climbs, it increasingly activates alpha receptors in blood vessels, causing vasoconstriction and raising blood pressure more aggressively. This dose-dependent shift is why careful titration matters: a rate that supports cardiac output at the low end can cause dangerous vasoconstriction at the high end.
In clinical use, the infusion is started low and increased incrementally while monitoring blood pressure, heart rate, and perfusion. The rate is expressed in mcg/kg/min for weight-based dosing or mcg/min for fixed-rate protocols.
IV Access and Extravasation Risk
Central venous access is strongly preferred for continuous epinephrine infusions. The drug is a potent vasoconstrictor, and if it leaks out of a peripheral IV into surrounding tissue (extravasation), it can cut off local blood flow and cause tissue death. Signs of extravasation include skin that appears cold, hard, and pale around the IV site.
If extravasation occurs, the rescue treatment involves injecting a vasodilator directly into the affected area through multiple small subcutaneous injections, using a fine needle. This needs to happen as quickly as possible after the leak is identified. The site is then monitored closely, because blanching can return and require additional treatment.
When peripheral access is the only option, the IV site should be checked frequently, ideally every few minutes during active infusion. Larger, more proximal veins (antecubital fossa or above) carry less risk than small hand or wrist veins.
Infusion Pump Requirements
Epinephrine drips require a programmable infusion pump, not gravity flow. The doses are measured in micrograms per minute, and even small rate errors can cause dangerous blood pressure swings. Most hospital systems use smart pumps with drug library guardrails that set soft and hard limits for concentration and rate, flagging entries outside expected ranges before allowing the infusion to start.
When programming the pump, you enter the drug concentration (mcg/mL), the patient’s weight if using weight-based dosing, and the desired rate. The pump calculates the mL/hr delivery. Double-checking the concentration label on the bag against what’s programmed into the pump is one of the most important safety steps in the process, since a mismatch between actual and programmed concentration delivers the wrong dose at every rate.