Sustained-Release Tablet Formulation Using Dual Viscosity Cellulose
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Solution Overview
Problem
Existing sustained-release tablet formulations often fail to completely release drugs due to either incomplete elution or excessively rapid elution, which hinders achieving desired pharmacological effects.
Innovation Solution
A process involving dry granulation of a mixture containing hydroxyalkyl celluloses with different viscosities, along with an active ingredient and additives, to form tablets that inhibit initial drug release and ensure complete elution over time, using hydroxypropyl cellulose with specific viscosity ranges and particle sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water-soluble polymers forming gel by contact with water are used as sustained-release preparations, then gel strength is improved and sustained-release effects are enhanced, but the drug may not completely elute from inside the preparation or elution speed may be too rapid
Solution Approach 1:
The invention uses a composite material system comprising HPMC and HPC in specific proportions (HPMC: 5.5-18% by mass, HPC: 5.5-18% by mass) to create a matrix that combines the gel-forming capability of HPMC with the structural reinforcement of HPC, achieving both gel strength and controlled drug elution
Solution Approach 2:
The invention specifies precise viscosity ranges for HPMC (400-100,000 cps at 2% aqueous solution) and HPC (50-25,000 cps at 2% aqueous solution) to optimize the balance between gel formation and drug release kinetics, ensuring complete elution while maintaining sustained-release effects
2Reliability
If high viscosity HPMC is used to enhance gel strength, then sustained-release properties are improved, but tablet hardness and mixture fluidity may be compromised
Solution Approach 1:
The combination of HPMC and HPC creates a synergistic effect where HPC fine particles (at least 50% passing through 100 mesh screen) provide structural support and tablet hardness, while HPMC forms the gel matrix for sustained-release, resolving the contradiction between gel strength and tablet mechanical properties
Solution Approach 2:
The invention assigns different functional roles to different components: HPC fine particles provide local structural reinforcement throughout the matrix, while HPMC provides the gel-forming continuous phase, creating localized functional zones that collectively achieve both sustained-release and mechanical strength
3Reliability
If HPMC and HPC are used in the preparation, then gel strength is improved, but the complexity of formulation increases
Solution Approach 1:
The invention establishes specific parameter ranges for HPMC viscosity (400-100,000 cps) and HPC viscosity (50-25,000 cps) that define the optimal formulation window, simplifying the formulation process by providing clear guidelines rather than requiring complex optimization experiments
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method efficiently produces sustained-release tablets with superior sustained-release properties, inhibiting initial drug elution and allowing complete release after a prescribed time, while improving tablet hardness and mixture fluidity.
Implementation Method 1
water-soluble polymers that form a gel by contact with water were used as such sustained-release preparations
Implementation Method 2
inhibiting the initial elution of a drug and allowing the drug to be completely eluted after a prescribed amount of time has elapsed
Data Source
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Figure 3~4
AI summary
A process is provided for efficiently producing sustained-release tablets having superior sustained-release properties capable of inhibiting the initial elution of a drug and allowing the drug to be completely eluted after a prescribed amount of time has elapsed. A process for producing sustained-release tablets comprising: dry granulating a mixture composed of a hydroxyalkyl cellulose (A) having a viscosity of 1 to 50 mPa · s in a 2% by mass aqueous solution at 20°C, a Hydroxyalkyl cellulose (B) having a viscosity of 100 mPa · s or more in a 2% by mass aqueous solution at 20°C, an active ingredient and an additive, and forming the resulting granules into tablets.