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Nifedipine stability in cardioplegic solution.

M B Bottorff, D A Graves, R G McAllister

American Journal of Hospital Pharmacy

|October 1, 1984

Summary

This summary is machine-generated.

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Nifedipine in cardioplegic solution degrades quickly, especially at room temperature. Prepare and refrigerate solutions just before use, protecting them from light to maintain potency.

Area of Science:

Cardiovascular pharmacology
Drug stability studies

Background:

Nifedipine is a calcium channel blocker used in cardiac surgery.
Cardioplegic solutions are critical for myocardial protection during surgery.
Understanding nifedipine stability in cardioplegic solutions is essential for effective clinical use.

Purpose of the Study:

To evaluate the stability of nifedipine in cardioplegic solution under various storage and administration conditions.
To determine the optimal preparation and storage guidelines for nifedipine-containing cardioplegic solutions.

Main Methods:

Nifedipine solutions (275 and 500 µg/L) were stored at 25°C (room light) and 4°C (refrigerated, dark).
Stability was assessed over 48 hours using gas chromatography.
Simulated infusions evaluated nifedipine degradation under different lighting and flow rates.

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Main Results:

Nifedipine degraded faster at 25°C than at 4°C.
Refrigerated and light-protected solutions lost <10% potency by ~6 hours.
No significant degradation occurred during simulated infusions.

Conclusions:

Nifedipine cardioplegic solutions exhibit limited stability.
Immediate preparation, refrigeration, and light protection are crucial until administration.
Further research may explore stabilizing agents or alternative formulations.