Stability of procainamide hydrochloride in neutralized 5% dextrose injection

Area of Science:

• Pharmaceutical Sciences
• Drug Stability Studies
• Intravenous Admixture Compatibility

Background:

• Procainamide hydrochloride is an antiarrhythmic medication often administered intravenously.
• Maintaining the stability of intravenous drug admixtures is critical for patient safety and therapeutic efficacy.
• Dextrose solutions are common vehicles for intravenous drug administration, but potential interactions require investigation.

Purpose of the Study:

• To evaluate the stability of procainamide hydrochloride in 5% dextrose injection.
• To determine the impact of pH neutralization and storage temperature on procainamide hydrochloride stability.
• To identify optimal conditions for preserving procainamide hydrochloride concentration in intravenous admixtures.

Main Methods:

• Sixty-four procainamide hydrochloride admixtures in 5% dextrose injection were prepared at 0.4% and 0.8% concentrations.
• Admixtures were either neutralized to pH 7.5 or maintained as controls.
• Samples were stored at room temperature (23-25°C) or 5°C for 24 hours.
• Procainamide hydrochloride concentrations were quantified using high-performance liquid chromatography (HPLC).

Main Results:

• Procainamide hydrochloride concentrations decreased over 24 hours in 5% dextrose injection.
• Stability was significantly enhanced in neutralized admixtures, under refrigeration, and at the 0.8% concentration.
• Complexation between procainamide and dextrose may contribute to degradation in control admixtures.

Conclusions:

• Neutralizing 5% dextrose injection or storing admixtures at 5°C effectively maintains procainamide hydrochloride concentrations for 24 hours.
• Neutralization is a more practical approach than refrigeration for ensuring procainamide hydrochloride stability during prolonged infusions.
• These findings support neutralization as a key strategy for optimizing procainamide hydrochloride intravenous therapy.