Bis-(2-Chloroethyl)Methylamine Topical Formulation Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bis-(2-chloroethyl)methylamine, a highly reactive alkylating agent used in treating skin disorders, is unstable in various media, particularly water, leading to limited stability and unpleasant formulations, necessitating frequent refrigeration and short storage times, which complicates patient use.
Innovation Solution
A pharmaceutical composition comprising bis-(2-chloroethyl)methylamine hydrochloride and 2-(2-ethoxy-ethoxy)-ethanol, with specific excipients, achieves stability for at least 90 days when stored at room temperature for up to 1 hour and refrigerated for the remainder of the day, even under conditions of humidity and light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bis-(2-chloroethyl)methylamine is formulated as an aqueous solution or petrolatum-based ointment, then it can be applied topically to treat skin disorders, but it becomes unstable and requires frequent refrigeration with short storage times
Solution Approach 1:
The patent uses a specific base (e.g., triethylamine, diethylisopropylamine) as an intermediary substance to stabilize the bis-(2-chloroethyl)methylamine hydrochloride in a greaseless topical formulation. The base forms a stable complex with the alkylating agent, preventing degradation while maintaining topical applicability. This resolves the contradiction by introducing a mediating substance that enables both stability and ease of operation.
Solution Approach 2:
The patent changes the pH and chemical environment parameters of the formulation by incorporating specific bases and buffering agents. This parameter modification stabilizes the bis-(2-chloroethyl)methylamine hydrochloride, extending storage time to at least 90 days at room temperature with refrigeration, thereby improving both stability and operational convenience without requiring frequent refrigeration.
2Ease of operation
If the composition is stored at room temperature for extended periods, then patient convenience is improved, but the drug degrades due to humidity and light exposure
Solution Approach 1:
The patent employs stabilizing bases and antioxidants as intermediary substances that protect the bis-(2-chloroethyl)methylamine hydrochloride from degradation by humidity and light. These intermediaries form protective complexes or scavenging systems that maintain drug integrity during room temperature storage, enabling patients to store the medication conveniently without constant refrigeration while ensuring at least 90% drug remains active.
3Ease of operation
If greaseless formulation is used instead of petrolatum-based ointment, then patient comfort is improved, but formulation stability becomes more difficult to achieve
Solution Approach 1:
The patent creates a composite greaseless formulation by combining bis-(2-chloroethyl)methylamine hydrochloride with specific bases (e.g., triethylamine), buffering agents, and antioxidants in a water-soluble or alcohol-based vehicle. This composite system provides both patient comfort (greaseless, non-sticky) and formulation stability (resistant to degradation), resolving the contradiction between comfort and manufacturability.
Solution Approach 2:
The patent modifies the formulation parameters by eliminating petrolatum and using alternative vehicles with different chemical properties. By adjusting pH, ionic strength, and incorporating chelating agents, the greaseless formulation achieves stability comparable to or better than traditional petrolatum-based formulations, while providing improved patient comfort and ease of application.
Data Source
AI summary
Provided are methods for treating skin disorders comprising topically applying a highly stable pharmaceutical composition comprising bis-(2-chloroethyl)methylamine or a pharmaceutically acceptable salt thereof.