Drug Product Expiration Dating

Drug product expiration dating establishes maximum shelf life during which pharmaceutical products maintain acceptable potency and safety under specified storage conditions. Stability studies at accelerated conditions including elevated temperature and humidity predict long-term stability. Real-time studies at controlled room temperature provide definitive dating. Container-closure systems protect contents preventing environmental degradation. Climate zones worldwide necessitate stability data at multiple conditions ensuring products maintain quality.

Accelerated study extrapolation assumes constant degradation rates; however, nonlinear kinetics require careful interpretation. Worst-case conditions including highest temperature within proven range support conservative dating. Photostability studies establish light protection requirements. Regulatory submissions include comprehensive stability protocols justifying assigned dating. Post-approval monitoring confirms dating appropriateness detecting unexpected stability failures.