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Backward Thinking: The Reverse Engineering of A Pressurized Metered Dose Inhaler
Development of a generic equivalent to a current marketed pressurized metered dose inhaler (pMDI) product brings immense challenges. Thorough analysis is critical to gain a comprehensive understanding of the physical attributes and pharmaceutical performance of the reference marketed product. Many factors need to be assessed, understood and combined in order to successfully develop a generic pMDI which will meet the regulatory and quality requirements as an equivalent product in the anticipated target market.
Significant information about the reference marketed product can be obtained from a thorough review of published literature, specifically the Summary of Product Characteristics (SPC) and Patient Information Leaflet (PIL). Additionally, baselining the reference marketed product for pharmaceutical performance offers a working target specification for in-vitro correlation. It will ensure the smoothest possible path to commercialization and maximize return on investment. In addition, baselining of the reference marketed product is done to understand batch-to-batch variability and product performance over the stated shelf life to establish targets for critical quality attributes (CQAs), which can be applied to the generic equivalent pMDI.
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