This includes drug stability studies Important parameters for new drugs and new drug development pharmaceutical formulation. Durability prediction plays a big role All dosage forms and their drug development Helps determine and suggest storage conditions for each Label description. Ensuring drug stability research Maintain product quality, safety and effectiveness throughout Durability is a prerequisite for acceptance Drug approval. These studies are necessary It will be implemented according to the guidelines issued by ICH. WHO or other institution Stability is crucial to the process of developing new drugs. Stability studies are regarded as a must for the acceptance and approval of any pharmaceutical product since they guarantee the stability of product quality, safety, and efficacy during the shelf life. This article will reduce the knowledge gap on the most important aspect for researcher or a developer who is developing a formulation by providing a complete information about drug stability, principle of drug degradation, Force degradation studies, Stability studies and their Classification, Factor Affecting Stability of Drug, Mechanism of Drug Degradation, Stability Testing, and Different ways to increase Drug Stability. As the different sources provided in this article which are mentioned above will resolve any problem regarding the stability of drug and by resolving the problem, it will influence a science oriented or research-oriented person to develop any formulation by providing the complete knowledge about this particulate topic.