Hydroxypropyl Cellulose Modified Release Formulation
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Solution Overview
Problem
Current modified release pharmaceutical formulations using hydrophilic polymeric matrices for oral administration are often costly, large, or lack uniform release times, and there is a need for materials that are physiologically acceptable and non-toxic to ensure effective and prolonged drug delivery without accumulation in the body.
Innovation Solution
A modified release formulation utilizing hydroxypropyl cellulose (HPC) with specific molar substitution, weight average molecular weight, and viscosity ranges, combined with pharmaceutically effective amounts of drugs and excipients, to achieve controlled and prolonged drug release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrophilic polymeric matrices are used for modified release formulations, then drug release control is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the chemical parameters of the polymer by using hydroxypropyl cellulose with specific molar substitution (2.7-3.9) and molecular weight (700,000-2,000,000 Daltons) ranges. This parameter optimization allows the polymer to provide effective drug release control while being more cost-effective than other hydrophilic matrices, directly resolving the contradiction between reliability and manufacturing cost
Solution Approach 2:
The formulation creates a composite system by combining hydroxypropyl cellulose with pharmaceutically active ingredients and excipients in specific ratios. This composite approach enhances the drug release control properties while maintaining cost-effectiveness, as the HPC matrix works synergistically with other components to achieve reliable modified release without requiring expensive additional additives
2Ease of operation
If modified release formulations are used to reduce dosing frequency, then patient compliance is improved, but formulation size increases
Solution Approach 1:
The patent optimizes the molecular weight parameter of hydroxypropyl cellulose to the range of 700,000-2,000,000 Daltons. This specific parameter range provides the right balance between viscosity and gel-forming capability, allowing the formulation to maintain drug release control in a compact size, thus improving patient compliance without excessive formulation volume
Solution Approach 2:
The hydroxypropyl cellulose matrix performs multiple functions simultaneously: it acts as a drug carrier, forms a gel barrier for controlled release, and provides structural integrity to the dosage form. This multi-functionality reduces the need for additional excipients and additives, keeping the formulation size compact while enabling reduced dosing frequency for improved patient compliance
3Reliability
If conventional immediate release formulations are administered multiple times daily, then therapeutic effect is maintained, but side effects increase due to concentration fluctuations
Solution Approach 1:
The hydroxypropyl cellulose matrix provides continuous drug release over an extended period, maintaining constant therapeutic blood levels without the peaks and troughs associated with immediate release formulations. This continuous action eliminates the concentration fluctuations that cause side effects, while reliably maintaining the therapeutic effect throughout the dosing interval
Solution Approach 2:
The patent specifies HPC with molar substitution of 2.7-3.9 and molecular weight of 700,000-2,000,000 Daltons, which creates a gel matrix with optimal pore structure and swelling characteristics. This parameter optimization enables sustained, uniform drug release that maintains stable blood concentrations, preventing the harmful concentration fluctuations that lead to side effects while ensuring reliable therapeutic effect
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
The formulation provides a controlled and prolonged release of drugs, reducing dosing frequency, maintaining therapeutic blood levels, and minimizing side effects by using HPC with defined properties to create a stable and effective drug delivery system.
Implementation Method 1
forming a composition which, when exposed to fluid, forms a gel
Implementation Method 2
the drug is then slowly released by diffusion from the gel
Data Source
AI summary
The present disclosure relates to hydroxypropyl cellulose (HPC) having a molar substitution of from about 3.0 to about 3.9, a weight average molecular weight of from about 800,000 to about 2,000,000 Daltons, and a volume average particle size of less than 100 μm, and modified release formulations derived therefrom.