Bilayer Metformin-Sitagliptin Tablet with Cellulose Binders
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing bilayer tablet formulations of metformin and sitagliptin face challenges with stability, dissolution profile, flowability, compressibility, and content uniformity, particularly when using high amounts of metformin and antioxidants.
Innovation Solution
A bilayer tablet design is implemented, where the first layer comprises an extended-release formulation of metformin with at least two cellulose derivative binders to address flowability and compressibility issues, and the second layer comprises an immediate-release formulation of sitagliptin with an antioxidant to ensure stability and desired dissolution profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of metformin are used in the tablet formulation, then the therapeutic efficacy is improved, but the flowability and compressibility deteriorate
Solution Approach 1:
The tablet is divided into two distinct layers: a first layer containing metformin with cellulose derivative binders, and a second layer containing sitagliptin with antioxidants. This segmentation allows each layer to be optimized independently, enabling high metformin content in the first layer without compromising manufacturing properties, while the second layer provides stability without interfering with the first layer's flowability and compressibility.
Solution Approach 2:
Different regions of the tablet (layers) are assigned different functional qualities. The first layer is designed with cellulose derivative binders to ensure proper flowability and compressibility for high metformin content, while the second layer contains antioxidants specifically for stability. This local differentiation resolves the contradiction by allowing high metformin efficacy in the first layer without the negative effects of antioxidants on flowability.
2Stability of the object's composition
If antioxidants are added to the metformin layer to improve stability, then the stability is improved, but the flowability deteriorates
Solution Approach 1:
The formulation is segmented into two layers with distinct functional assignments. Antioxidants are placed exclusively in the second layer (sitagliptin layer) rather than the first layer (metformin layer). This segmentation allows the metformin layer to maintain optimal flowability without antioxidants, while the sitagliptin layer provides the necessary stability function.
Solution Approach 2:
The second layer acts as an intermediary that provides the stability function (through antioxidants) without directly interfering with the first layer's flowability. The bilayer structure serves as a mediator that separates the conflicting requirements: the first layer optimizes for flowability and compressibility, while the second layer optimizes for stability.
3Stability of the object's composition
If a bilayer tablet design is implemented to separate metformin and sitagliptin, then the stability and dissolution profile are improved, but the device complexity increases
Solution Approach 1:
The tablet is segmented into two layers with distinct functions: the first layer provides extended-release metformin with optimized flowability, and the second layer provides immediate-release sitagliptin with antioxidants for stability. This segmentation resolves the contradiction by achieving improved stability and dissolution profiles through functional separation, while the segmentation itself into just two layers keeps the complexity manageable compared to more complex multi-layer or controlled-release mechanisms.
Data Source
AI summary
The present invention relates to a bilayer tablet comprising extended-release formulation having metformin or a pharmaceutically acceptable salt thereof and at least one cellulose derivates as binder and immediate release formulation having sitagliptin or a pharmaceutically acceptable salt thereof and at least one antioxidant. The present invention also relates to a simple, rapid, cost effective, time-saving and industrially convenient process of preparing the bilayer tablet.