Acetaminophen Injection Composition Solubility and Stability
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Solution Overview
Problem
Acetaminophen injections face challenges due to low solubility in aqueous solutions, leading to recrystallization and potential hepatotoxicity, requiring careful handling and storage, and current treatments for overdose involve complex detoxification processes with side effects.
Innovation Solution
An injection composition containing acetaminophen with a solubilizing agent like arginine or povidone, a toxic inhibitor such as N-acetylcysteine, an isotonic agent like mannitol, and an antioxidant like cysteine, maintaining a pH of 4 to 8, which increases solubility and stability, preventing recrystallization and hepatotoxicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If acetaminophen is prepared in the form of an injection, then it can achieve faster drug effect and avoid side effects of NSAID, but recrystallization may be precipitated in distribution process due to low solubility
Solution Approach 1:
The patent introduces a solubilizing agent as an intermediary substance that facilitates the dissolution of acetaminophen in aqueous solution. This mediator prevents recrystallization during distribution while maintaining the injectable form, thus preserving the fast-acting advantage without compromising solution stability.
Solution Approach 2:
The patent modifies the chemical parameters of the solution by adjusting pH levels and incorporating specific excipients that enhance acetaminophen solubility. These parameter changes maintain the drug in dissolved state during distribution, preventing recrystallization while preserving the rapid therapeutic effect.
2Stability of the object's composition
If acetaminophen injection is stored at low temperature, then distribution stability is improved, but recrystallization occurs causing vascular embolism risk
Solution Approach 1:
The solubilizing agent acts as a protective intermediary that prevents acetaminophen molecules from aggregating and forming crystals at low temperatures. This mediator maintains molecular dispersion during cold distribution, ensuring stability without triggering the harmful recrystallization effect.
Solution Approach 2:
The patent incorporates stabilizing excipients and pH adjusters that pre-condition the solution to resist temperature-induced recrystallization. This beforehand cushioning protects against the harmful effect of crystal formation during cold chain distribution, eliminating vascular embolism risk.
3Object-affected harmful factors
If acetaminophen is administered to treat overdose, then hepatotoxicity can be prevented, but complicated detoxification process and side effects occur
Solution Approach 1:
The patent combines acetaminophen with hepatoprotective agents and solubilizing excipients in a single injection formulation. This merging integrates the detoxification function directly into the therapeutic agent, simplifying the treatment process from multiple separate interventions to a single combined administration.
Solution Approach 2:
The injection formulation serves multiple functions simultaneously: it provides the therapeutic acetaminophen effect, prevents hepatotoxicity through incorporated protective agents, and maintains solution stability. This multi-functionality eliminates the need for separate detoxification procedures and reduces overall treatment complexity.
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 ensures low-temperature stability, prevents hepatotoxicity, and simplifies the detoxification process, enhancing safety and efficacy by maintaining acetaminophen solubility and reducing side effects.
Implementation Method 1
acetaminophen with a solubilizing agent like arginine or povidone, a toxic inhibitor such as N-acetylcysteine, an isotonic agent like mannitol, and an antioxidant like cysteine, maintaining a pH of 4 to 8, which increases solubility and stability, preventing recrystallization
Implementation Method 2
acetaminophen is decomposed in the presence of oxygen and light, and can exhibit hepatotoxicity due to benzoquinone imine which is acetaminophen degradation product. Therefore, an injection containing acetaminophen should be carefully handled in the manufacturing and distribution processes.
Implementation Method 3
acetaminophen may be hydrolyzed in an acidic or basic environment, and hydrolysis occurs at a minimum as the pH approaches 6
Data Source
AI summary
The present disclosure relates to the injection composition containing acetaminophen, the injection composition comprising acetaminophen mixed in 0.01∼5 wt%, a solubilizer mixed in 0.01∼10 wt%, a toxicity inhibitor mixed in 0.05∼5 wt%, an isotonic agent mixed in 0.1∼10 wt%, an antioxidant mixed in 0.001∼5 wt%, and the balance sterile purified water for injection.