Oral Aqueous Flurbiprofen-Chlorhexidine Composition for Mucosal Absorption
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Solution Overview
Problem
Existing formulations of flurbiprofen and chlorhexidine suffer from low solubility, unpleasant taste, gastrointestinal side effects, and staining of teeth, making them unsuitable for effective topical application, particularly for treating periodontal diseases and muco-epidermal infections.
Innovation Solution
A stable oral topical aqueous composition is developed with a pH of 6-7, incorporating eucalyptus oil to enhance solubility and taste, and using alkalizing agents to improve absorption from the mucosal surface, along with suitable excipients for stability and application form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flurbiprofen is administered orally, then systemic anti-inflammatory effects are achieved, but gastrointestinal irritation and side effects occur
Solution Approach 1:
The patent uses the oral mucosal surface as an intermediary route of administration. Instead of direct oral ingestion that contacts the gastrointestinal tract, flurbiprofen is delivered through mouthwash or spray formulations that allow trans-mucosal absorption, providing systemic anti-inflammatory effects while bypassing GI irritation
Solution Approach 2:
The patent replaces the gastrointestinal absorption pathway with mucosal absorption pathway. By formulating flurbiprofen in aqueous solutions optimized for mucosal penetration (pH 6-7, specific surfactants), the drug is absorbed through the oral mucosa into the bloodstream, achieving systemic effects without GI contact
2Object-affected harmful factors
If flurbiprofen is formulated in aqueous solution, then gastrointestinal side effects are avoided, but water solubility is poor
Solution Approach 1:
The patent optimizes multiple parameters to achieve flurbiprofen solubility in aqueous media: pH is adjusted to 6-7 to enhance ionization and solubility, surfactants (0.1-5% w/v) are added to form micelles that solubilize the hydrophobic drug, and cosolvents are incorporated. These parameter changes enable sufficient aqueous solubility while maintaining the GI-safe topical route
Solution Approach 2:
The patent creates a composite aqueous formulation system containing flurbiprofen, surfactants, cosolvents, and buffering agents. This composite system works synergistically to solubilize the poorly water-soluble flurbiprofen while maintaining stability and appropriate pH for mucosal application
3Reliability
If chlorhexidine is used in oral preparations, then antiseptic and anti-plaque effects are achieved, but tooth staining occurs with repeated use
Solution Approach 1:
The patent optimizes chlorhexidine concentration (0.06-2% w/v) and formulation pH to reduce staining. By controlling these parameters and using optimized delivery systems, the patent maintains antiseptic efficacy while minimizing the concentration and contact time that cause tooth staining
Solution Approach 2:
The patent uses surfactants and cosolvents as intermediaries to modify chlorhexidine's interaction with tooth surfaces. These additives alter the adsorption characteristics of chlorhexidine, reducing its tendency to bind strongly to enamel and cause staining while preserving its antimicrobial activity
4Reliability
If chlorhexidine is used in oral preparations, then antimicrobial effects are achieved, but bitter taste reduces patient acceptability
Solution Approach 1:
The patent uses flavoring agents (mint, eucalyptus, or other pharmaceutically acceptable flavors) as intermediaries to mask the bitter taste of chlorhexidine. These flavoring compounds provide a pleasant sensory experience that masks the unpleasant bitter taste, improving patient compliance without affecting antimicrobial efficacy
Solution Approach 2:
The patent optimizes chlorhexidine concentration within a range (0.06-2% w/v) that balances antimicrobial efficacy with acceptable taste. Lower concentrations within this range reduce bitterness while maintaining therapeutic effectiveness, and this concentration optimization is combined with flavoring agents for enhanced acceptability
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 composition achieves enhanced solubility, improved taste, and effective absorption, preventing tooth staining while providing anesthetic relief and stability, suitable for treating periodontal diseases and infections.
Implementation Method 1
the pH of the solution is adjusted to pH 6-7 thus the solubility of flurbiprofen is increased
Implementation Method 2
mint oil or eucalyptus oil not only masks the bitter taste of flurbiprofen and chlorhexidine
Implementation Method 3
having desired levels of dissolution rate, solubility, enhanced taste and absorption from mucosal surface
Implementation Method 4
absorption from mucosal surface
Data Source
AI summary
The present invention relates to stable topical aqueous pharmaceutical compositions comprising flurbiprofen or pharmaceutically acceptable salts thereof and chlorhexidine or salts thereof. More particularly, the present invention relates to a stable oral topical aqueous pharmaceutical composition of this combination having desired levels of dissolution rate, solubility, enhanced taste and absorption from mucosal surface, comprising mint oil or eucalyptus oil and wherein the pH of the solution is between 6 to 7.