Objective: To predict the stable life for a complex injection of Chinese materia medica.
Method: The prediction was carried out by initial average rate stability tests, and the contents of puerarin and danshensu (major active components of the injection) were assayed by HPLC.
Result: The degradation of puerarin followed the first order action, while danshensu was hard to determine; the t0.9,25 degrees C was 3.49 years and 1.69 years respectively.
Conclusion: The stable life of the injection has been determined as 1.5 years.