Pharmaceutical Gel Capsule Preventing Parenteral Diversion
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Solution Overview
Problem
Narcotic and psychotropic pharmaceutical compositions are vulnerable to diversion from their intended route of administration due to their bioavailability and ease of dissolution, leading to potential misuse through parenteral injection.
Innovation Solution
A solid pharmaceutical composition in the form of a capsule containing a narcotic or psychotropic active ingredient combined with a gelling agent (such as hydroxyethylcellulose or sodium carboxymethylcellulose) and a disintegrating agent (like sodium carboxymethyl starch), which forms a gel upon contact with a small volume of water, making parenteral injection difficult.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid pharmaceutical compositions are made in a form that is easy to dissolve in water, then bioavailability is improved, but the risk of diversion to parenteral injection increases
Solution Approach 1:
The patent changes the physical-chemical parameters of the formulation by incorporating gelling agents (hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropyl methylcellulose, methylcellulose, ethyl methylcellulose, sodium carboxymethylcellulose, or calcium carboxymethylcellulose) that transform the solution properties upon contact with water. The gelling agent is present at 10-20% weight content, creating a gel matrix that maintains drug release for oral absorption while preventing rapid dissolution suitable for injection.
Solution Approach 2:
The patent creates a composite pharmaceutical formulation by combining the active ingredient with gelling agents and disintegrating agents (such as sodium carboxymethyl starch) in specific ratios (gelling agent to disintegrating agent ratio of 0.40 to 0.60/1). This composite structure provides both the disintegration needed for oral bioavailability and the gel formation that prevents parenteral misuse.
2Productivity
If capsules are designed to disintegrate rapidly in water, then oral absorption is improved, but the formulation becomes suitable for parenteral injection
Solution Approach 1:
The patent balances the disintegration parameter by using disintegrating agents (such as sodium carboxymethyl starch) in controlled amounts with gelling agents. The specific ratio (0.40 to 0.60/1) ensures that the capsule disintegrates sufficiently for oral absorption but simultaneously triggers gel formation that prevents the dissolved material from being suitable for injection.
Solution Approach 2:
The gelling agent acts as an intermediary substance that mediates between the disintegrating agent and the active ingredient. When water is added, the disintegrating agent promotes breakdown of the capsule matrix while the gelling agent simultaneously forms a gel network that traps the released material, creating a state that is absorbed orally but not suitable for parenteral administration.
3Ease of operation
If the formulation contains only disintegrating agents, then capsule disintegration is improved, but gel formation to prevent injection is insufficient
Solution Approach 1:
The patent merges the functions of disintegrating agents and gelling agents into a single formulation system. The disintegrating agent (such as sodium carboxymethyl starch) and gelling agent (such as sodium carboxymethylcellulose) work synergistically - the disintegrating agent breaks down the capsule structure while the gelling agent forms the protective gel matrix, achieving both easy disintegration and effective diversion prevention.
Solution Approach 2:
The patent optimizes the concentration parameters of both disintegrating and gelling agents to achieve the desired dual effect. The gelling agent is present at 10-20% weight content with a specific ratio to the disintegrating agent (0.40 to 0.60/1), creating the right balance between disintegration ease and gel formation strength to prevent parenteral misuse.
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 effectively prevents rapid diversion by forming a high-viscosity gel upon contact with water, making it difficult to inject while maintaining bioavailability and stability, as demonstrated by the plasma profile and injection tests.
Implementation Method 1
which forms a gel upon contact with a small volume of water, making parenteral injection difficult
Implementation Method 2
containing a narcotic or psychotropic active ingredient combined with a gelling agent and a disintegrating agent
Data Source
AI summary
A solid pharmaceutical composition in the form of a gel capsule containing at least one active ingredient and also at least one gelling agent chosen from cellulose derivatives such as hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, methylcellulose, ethylmethylcellulose, sodium carboxymethylcellulose (CMC) and calcium carboxymethylcellulose, and at least one disintegrating agent, the gelling agent and the disintegrating agent being present in a ratio by weight of 0.3 to 0.7/1 and the content by weight of gelling agent(s) being from 10% to 20% of the composition, and method for preparing same.