Pharma Stability: Insights, Guidelines, and Expertise
Pediatric medicines frequently take the form of oral suspensions, syrups, or chewable tablets. These forms often use sweeteners, flavors, and colorants to improve palatability, but many of these excipients are susceptible to degradation. For instance:
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Drugs degrade differently under varying conditions. Temperature, humidity, and light can all impact the chemical and physical stability of the product. Regulatory authorities such as the USFDA, EMA, and CDSCO expect data across defined ICH climatic zones to justify shelf life claims.
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Shelf life determination is influenced not only by the intrinsic stability of the drug but also by the protective capability of its packaging system. A well-designed packaging solution ensures that the formulation remains within its specifications throughout the labeled expiry period.
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Every API undergoes degradation to some extent over time. Regulatory authorities such as EMA and CDSCO require evidence that drug products remain safe and effective throughout their shelf life. To meet these expectations, manufacturers must identify degradation mechanisms, evaluate impurity profiles, and quantify degradation rates under various storage conditions.
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Light exposure initiates photolytic reactions that can degrade light-sensitive APIs and excipients. This can lead to visible color change, loss of efficacy, and generation of degradation products. Many APIs, including nifedipine, riboflavin, and ketoprofen, are known for photolability. The ICH Q1B guideline specifically addresses light stability studies, making it a regulatory requirement for global submissions.
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Long-term storage evaluation under ICH conditions (25°C/60%RH or 30°C/65%RH) simulates actual product lifecycle conditions. APIs prone to degradation pose risks to product safety, efficacy, and regulatory compliance. Assessing the sensitivity of the API early in development mitigates failure risks in stability studies and post-market surveillance.
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Temperature accelerates chemical reactions, making it one of the most significant factors in degradation kinetics. The Arrhenius equation illustrates that every 10°C increase can double the rate of degradation for many compounds.
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Temperature is the most significant factor impacting the chemical and physical stability of pharmaceutical products. According to Arrhenius kinetics, for every 10°C increase in temperature, the degradation rate of a drug can double or even triple.
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