Nicardipine Infusion Dilution and Concentration
Nicardipine for intravenous infusion should be diluted to a concentration of 0.1 mg/mL (100 µg/mL) for standard administration, or 0.2 mg/mL (200 µg/mL) for premixed flexible containers. 1
Standard Preparation from Single-Dose Vials
Each 25 mg vial must be diluted with 240 mL of compatible IV fluid to yield 250 mL at a concentration of 0.1 mg/mL (100 µg/mL). 1 This is the FDA-approved standard concentration for nicardipine infusion.
Compatible Diluents
The following solutions are compatible for 24 hours at room temperature 1:
- Dextrose 5% Injection
- Dextrose 5% and Sodium Chloride 0.45% Injection
- Dextrose 5% and Sodium Chloride 0.9% Injection
- Dextrose 5% with 40 mEq Potassium
- Sodium Chloride 0.45% Injection
- Sodium Chloride 0.9% Injection
Do NOT use Sodium Bicarbonate 5% or Lactated Ringer's—these are incompatible with nicardipine. 1
Premixed Flexible Containers
Premixed nicardipine solutions come in two concentrations 1:
- 20 mg in 200 mL (0.1 mg/mL)
- 40 mg in 200 mL (0.2 mg/mL)
These require no dilution and are ready to use. 1
Clinical Context: Concentration and Phlebitis Risk
While the FDA-approved concentration is 0.1 mg/mL, research demonstrates that maintaining maximum nicardipine concentration below 130 µg/mL (0.13 mg/mL) significantly reduces phlebitis risk 2. In a study of 300 acute stroke patients, diluting nicardipine to concentrations below 130 µg/mL reduced phlebitis incidence from 30% to 9.9% (P < 0.001) 2.
This creates a practical consideration: the standard 0.1 mg/mL concentration is close to but below this threshold, while the 0.2 mg/mL premixed concentration exceeds it. For peripheral administration, the 0.1 mg/mL concentration is preferable to minimize phlebitis risk.
Administration Guidelines
Administer via central line or large peripheral vein. 1 If using peripheral access:
- Change infusion site every 12 hours to reduce venous irritation 1, 3, 4
- Avoid small veins (dorsum of hand or wrist) 5
- Monitor for signs of phlebitis
Do not combine nicardipine with any other product in the same IV line or premixed container. 1
Dosing Reference (for context, not dilution)
The guidelines consistently recommend 3, 4, 3, 6, 7:
- Initial rate: 5 mg/hr
- Titrate by 2.5 mg/hr every 5-15 minutes
- Maximum: 15 mg/hr
- Once target BP achieved, reduce to 3 mg/hr for maintenance 4