Bismuth Subsalicylate Suspension With a Lead-Free Three-Gum System
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Solution Overview
Problem
Existing bismuth subsalicylate formulations rely on magnesium aluminum silicate, which may contain trace amounts of lead, and struggle to maintain suspension without sedimentation, necessitating a lead-free alternative that effectively keeps bismuth subsalicylate in suspension.
Innovation Solution
A three-gum system comprising bismuth subsalicylate, microcrystalline cellulose, xanthan gum, and excipients like carboxymethyl cellulose or hydroxyethyl cellulose is used to suspend bismuth subsalicylate, eliminating the need for magnesium aluminum silicate and maintaining suspension without sedimentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If magnesium aluminum silicate is used to suspend bismuth subsalicylate, then suspension stability is improved, but lead contamination risk increases
Solution Approach 1:
The patent removes magnesium aluminum silicate (the harmful component containing lead) from the formulation and replaces it with an alternative gum system consisting of xanthan gum, carboxymethyl cellulose, and hydroxyethyl cellulose, thereby eliminating lead contamination while maintaining suspension stability
Solution Approach 2:
The patent employs a composite gum system combining three different gums (xanthan gum, carboxymethyl cellulose, and hydroxyethyl cellulose) to achieve the suspension stability previously provided by magnesium aluminum silicate, without the associated lead contamination risk
2Stability of the object's composition
If magnesium aluminum silicate is used to suspend bismuth subsalicylate, then sedimentation prevention is improved, but formulation complexity increases
Solution Approach 1:
The patent divides the suspension stabilization function among three separate gum components (xanthan gum, carboxymethyl cellulose, and hydroxyethyl cellulose), each contributing different properties that collectively prevent sedimentation, replacing the single-component magnesium aluminum silicate system
Solution Approach 2:
The patent changes the chemical composition parameters of the gum system from magnesium aluminum silicate to a combination of polysaccharide-based gums, altering the mechanism of suspension stabilization while achieving equivalent or superior sedimentation prevention
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 three-gum system effectively prevents sedimentation of bismuth subsalicylate, ensuring stable suspension and reducing lead content, while maintaining suitable viscosity and pH for oral administration.
Implementation Method 1
microcrystalline cellulose, xanthan gum, and an excipient selected from the group consisting of: carboxymethyl cellulose (CMC), carageenan, and hydroxyethyl cellulose (HEC), or combinations thereof
Data Source
AI summary
The invention is directed to pharmaceutical compositions for suspending bismuth subsalicylate and methods of use thereof. Formulations of the present invention include at least three-gum systems to prevent the settling out of heavy particles in solution and do not include magnesium aluminum silicate. The pharmaceutical compositions may be used to treat gastrointestinal disorders.