Tolvaptan Tablet via Spray Granulation for Dissolution
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Solution Overview
Problem
Tolvaptan, a poorly soluble drug, faces challenges with dissolution and bioavailability due to its low solubility, which affects its absorption and stability in existing oral pharmaceutical formulations, particularly in spray granulation methods.
Innovation Solution
A tablet composition comprising tolvaptan and a binder, such as low substituted hydroxypropylcellulose, obtained through spray granulation with a water-based solution, along with disintegrants like sodium starch glycolate and fillers like microcrystalline cellulose, to enhance solubility, bioavailability, and stability, using a process that includes fluid bed granulation and controlled humidity drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional wet granulation or solid dispersion methods are used for tolvaptan, then dissolution rate may be improved, but manufacturing complexity and process difficulty increase significantly
Solution Approach 1:
The invention changes the fundamental parameters of the granulation process by using spray granulation instead of conventional wet granulation or solid dispersion methods. This involves changing the binding mechanism from liquid binding in wet granulation to spray-drying-based binding, and from dissolution-based solid dispersion to direct spray granulation of the API with excipients. This parameter change simplifies the manufacturing process while maintaining improved dissolution rate.
Solution Approach 2:
The invention extracts the complex steps of solid dispersion preparation (dissolving API in solvent, evaporating solvent, forming dispersion) and replaces them with a direct spray granulation process. This takes out the unnecessary intermediate steps of dissolution and evaporation, directly forming granules with improved dissolution characteristics through the spray drying mechanism.
2Stability of the object's composition
If spray granulation is used to improve dissolution profile, then bioavailability increases, but process control difficulty and manufacturing challenges arise
Solution Approach 1:
The invention uses spray granulation as an intermediary process that combines the benefits of wet granulation (granule formation) with spray drying (rapid solvent removal and encapsulation). This intermediary approach allows controlled formation of granules with embedded tolvaptan in a matrix, improving bioavailability while the controlled spray parameters enable manageable process control.
Solution Approach 2:
The invention utilizes phase transition from liquid spray to solid granule through rapid drying. The spray solution containing tolvaptan and excipients undergoes phase transition as the solvent evaporates during spray drying, forming solid granules with controlled morphology and composition. This phase transition mechanism provides inherent process control through control of spray parameters and drying conditions.
3Stability of the object's composition
If water-based spray granulation is used, then dissolution and bioavailability improve, but risk of drug degradation or instability increases
Solution Approach 1:
The invention uses rapid spray drying to skip through the period when the drug is exposed to water in solution form. The spray granulation process rapidly transitions from liquid spray to solid granule through fast evaporation, minimizing the time window during which tolvaptan could be susceptible to water-mediated degradation. This 'rushing through' the aqueous phase reduces degradation risk while maintaining dissolution benefits.
Solution Approach 2:
The invention performs preliminary encapsulation of tolvaptan within the granule matrix during the spray granulation process. The API is incorporated into excipient matrices (such as cellulose derivatives or sugars) that provide protective environment, preventing direct exposure to degrading conditions during storage while maintaining dissolution characteristics for improved bioavailability.
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 approach results in improved dissolution profile, bioavailability, and long-term stability, with desired pharmacomechanic properties like flowability and compressibility, overcoming the limitations of prior art formulations.
Implementation Method 1
spray granulation with a solution comprising water and binder
Implementation Method 2
controlled humidity drying
Data Source
AI summary
The present invention relates to a tablet comprising an intragranular composition comprising tolvaptan and at least one binder, wherein the intragranular composition is obtained by spray granulation with a solution comprising water and binder.