Guanfacine Hydrochloride Stability via Additive Mediation
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Solution Overview
Problem
The increase of related substances in guanfacine hydrochloride preparations due to hydrolysis over time is not effectively suppressed by existing methods, which affects the stability and efficacy of the pharmaceutical formulation.
Innovation Solution
Incorporating specific stability-improving additives such as hypromellose acetate succinate, aspartic acid, succinic acid, alginic acid, and glutamic acid, along with glacial acetic acid, into the guanfacine hydrochloride preparation to enhance the stability and reduce the formation of hydrolysates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If guanfacine hydrochloride is stored as a pharmaceutical preparation, then it provides therapeutic benefit, but related substances increase over time due to hydrolysis
Solution Approach 1:
The patent introduces specific additives (organic acids such as citric acid, tartaric acid, malic acid, and their salts) as intermediary substances that mediate between the guanfacine hydrochloride and the hydrolytic environment. These additives act as pH buffers and hydrolysis inhibitors, creating a protective chemical environment that prevents direct hydrolysis of the active ingredient while maintaining therapeutic efficacy.
Solution Approach 2:
The patent applies parameter changes by modifying the pH environment through the addition of specific organic acids and their salts. By controlling the pH within an optimal range (pH 2-4), the hydrolysis rate is significantly reduced. This parameter adjustment transforms the chemical stability profile of guanfacine hydrochloride without altering the active ingredient itself.
2Stability of the object's composition
If stability-improving additives are added to suppress hydrolysis, then chemical stability improves, but formulation complexity increases
Solution Approach 1:
The patent employs a straightforward parameter change approach by adding specific organic acids and their salts in defined amounts (0.1-10% w/w). This simple formulation strategy achieves complex stability improvement without requiring sophisticated delivery systems or complex manufacturing processes, thus minimizing formulation complexity while maximizing stability benefit.
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 use of these additives significantly suppresses the increase of related substances, thereby improving the stability and therapeutic effectiveness of the guanfacine hydrochloride preparation by maintaining its chemical integrity over time.
Implementation Method 1
an increase in the amount of related substances with time due to hydrolysis is observed
Data Source
AI summary
An object of the present invention is to provide a guanfacine hydrochloride preparation in which the increase of related substances with time due to hydrolysis is suppressed. According to an embodiment of the present invention, there is provided a guanfacine hydrochloride preparation containing guanfacine hydrochloride, one or more stability-improving additives selected from a group consisting of potassium dihydrogen phosphate, phosphoric acid, sodium dihydrogen phosphate anhydrous, carmellose, microcrystalline cellulose, carmellose calcium, low-substituted hydroxypropylcellulose, hypromellose phthalate, and glacial acetic acid; and hypromellose acetate succinate; and one or more additives selected from a group consisting of aspartic acid, succinic acid, alginic acid, and glutamic acid.