Formulation of a stable vidarabine phosphate injection

Area of Science:

• Pharmaceutical formulation and stability studies.
• Drug degradation kinetics.
• Sterilization validation.

Background:

• Vidarabine phosphate is an antiviral medication.
• Ensuring the stability of injectable formulations is critical for therapeutic efficacy and patient safety.
• Sterilization methods can impact drug integrity.

Purpose of the Study:

• To assess the stability of a vidarabine phosphate injection fluid formulation.
• To evaluate the impact of steam sterilization on drug degradation.
• To predict the long-term stability of the formulation under recommended storage conditions.

Main Methods:

• Formulation of vidarabine phosphate injection fluid (37.5 mg/ml, pH 7.4).
• Exposure to steam sterilization at 120°C for 20 minutes and 100°C for 30 minutes.
• Storage of the formulation at 4°C for four months.
• Analysis of degradation using quantitative methods (implied).
• Degradation rate analysis at elevated temperatures.

Main Results:

• A 6.1% degradation was observed after steam sterilization at 120°C for 20 minutes.
• No significant degradation was detected after heating at 100°C for 30 minutes.
• No significant degradation occurred after four months of storage at 4°C.
• Degradation kinetics predict negligible loss over three years at 4°C.

Conclusions:

• Vidarabine phosphate injection fluid demonstrates good stability under specific sterilization and storage conditions.
• The formulation is suitable for steam sterilization at 100°C for 30 minutes.
• The predicted long-term stability supports a three-year shelf life at 4°C.