4,5-Epoxymorphinan Tablet Stability via Disintegrating Agents
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Solution Overview
Problem
The 4,5-epoxymorphinan derivative, a compound effective for pruritus, is chemically unstable to light, heat, and oxygen, and existing stabilization methods for morphinan compounds do not effectively maintain stability in tablet form over long periods, especially when exposed to environmental conditions.
Innovation Solution
A tablet formulation comprising a 4,5-epoxymorphinan derivative or its pharmacologically acceptable acid addition salt, combined with sodium thiosulfate and either crospovidone or sodium carboxymethyl starch, which are used in specific proportions to enhance stability, allowing for a fast-disintegrating and intraorally disintegrating tablet with improved storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional stabilization methods (antioxidants like sodium thiosulfate) are used for 4,5-epoxymorphinan derivative in liquid form, then chemical stability is improved, but tablet stability over long period in unpacked state or normal package form deteriorates
Solution Approach 1:
The patent introduces crospovidone or sodium carboxymethyl starch as intermediary substances that mediate between the unstable 4,5-epoxymorphinan derivative and the tablet matrix. These disintegrating agents create a protective microenvironment that prevents direct contact between the derivative and destabilizing factors, thereby maintaining tablet stability during long-term storage while still allowing rapid disintegration upon administration.
Solution Approach 2:
The patent creates a composite tablet formulation combining 4,5-epoxymorphinan derivative with specific disintegrating agents (crospovidone or sodium carboxymethyl starch) and other excipients. This composite structure leverages the unique properties of each component: the derivative provides therapeutic effect, while the disintegrating agents provide both structural integrity during storage and rapid disintegration upon contact with moisture, resolving the contradiction between stability and duration.
2Ease of operation
If fast-disintegrating tablet formulation is used to improve dose compliance, then ease of operation is improved, but storage stability deteriorates
Solution Approach 1:
The patent optimizes the parameters of the disintegrating agents, specifically using crospovidone or sodium carboxymethyl starch at controlled proportions. These substances have specific physical and chemical parameters (particle size, porosity, hydrophilicity) that are tuned to achieve dual functionality: maintaining structural stability during storage and enabling rapid disintegration upon contact with moisture in the oral cavity, thus resolving the contradiction between ease of operation and storage stability.
3Ease of operation
If conventional disintegrating agents are used to achieve quick disintegration, then ease of operation is improved, but stabilization effect is not sufficient for long-term storage
Solution Approach 1:
The patent employs crospovidone or sodium carboxymethyl starch as sacrificial disintegrating agents that are designed to remain stable during long-term storage but rapidly decompose/disintegrate upon contact with moisture. These substances serve as temporary protective structures during storage that are intentionally designed to be short-lived and rapidly break down during administration, providing both storage stability and quick disintegration.
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 tablet formulation achieves superior storage stability and reduced decomposition of the 4,5-epoxymorphinan derivative, maintaining stability even after long-term storage under accelerated conditions, as demonstrated by high residual ratios of the active ingredient.
Implementation Method 1
a stable pharmaceutical composition can be obtained by allowing the composition to contain a saccharide(s) or sugar alcohol(s) and an antioxidant such as sodium thiosulfate
Implementation Method 2
as disintegrating agent, crospovidone or sodium carboxymethyl starch, an intraorally disintegrating-type tablet which is intended for improving the dose compliance
Data Source
AI summary
The present invention relates to a stable tablet comprising a 4,5-epoxymorphinan derivative or a pharmacologically acceptable acid addition salt thereof as an effective ingredient. That is, the tablet according to the present invention comprises: (1) as the effective ingredient, a specific 4,5-epoxymorphinan derivative or a pharmacologically acceptable acid addition salt; (2) sodium thiosulfate; (3) at least one selected from the group consisting of saccharides and sugar alcohols; and (4) crospovidone, sodium carboxymethyl starch or a mixture thereof, in which tablet the content of the aforementioned (4) is 1 to 20% by weight per unit weight containing the aforementioned effective ingredient.