Telmisartan Hydrochlorothiazide Tablet Segmentation
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Solution Overview
Problem
The challenge lies in creating a stable pharmaceutical composition that combines telmisartan, which is poorly soluble at neutral pH, with hydrochlorothiazide, which degrades in alkaline environments, requiring specialized equipment for separate unit administration and simultaneous release.
Innovation Solution
A pharmaceutical composition comprising units of telmisartan and hydrochlorothiazide, where one unit is coated with the other, using pharmaceutically acceptable excipients like polyvinylpyrrolidone and colloidal silicon dioxide, allowing for conventional tableting equipment to produce stable tablets with improved stability through controlled pH and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydrochlorothiazide is combined with alkaline active substance in a single unit, then simultaneous release is achieved, but hydrochlorothiazide degrades in alkaline environment
Solution Approach 1:
The patent divides the formulation into two separate units: one containing telmisartan (alkaline active substance) and another containing hydrochlorothiazide. These units are then compressed together into a single tablet, allowing simultaneous release while preventing direct contact between the alkaline drug and hydrochlorothiazide, thus avoiding degradation.
Solution Approach 2:
The patent uses an acidic excipient (such as citric acid or ascorbic acid) as an intermediary substance in the hydrochlorothiazide unit. This acidic component counteracts the alkaline environment created by telmisartan, creating a buffer system that protects hydrochlorothiazide from alkaline degradation while still allowing both drugs to be released simultaneously when the tablet disintegrates.
2Reliability
If separate units are used for hydrochlorothiazide and alkaline active substance, then stability is maintained, but specialized manufacturing equipment is required
Solution Approach 1:
The patent combines the preparation of two separate units (telmisartan unit and hydrochlorothiazide unit) with the final tablet compression step into a single manufacturing process. Both units are prepared separately but then compressed together in the same tableting machine, eliminating the need for specialized equipment while maintaining the stability benefits of separate unit formulation.
3Quantity of substance
If hydrochlorothiazide is exposed to alkaline media, then bioavailability of telmisartan is improved, but hydrochlorothiazide degrades to DSA
Solution Approach 1:
The patent separates the alkaline telmisartan unit from the hydrochlorothiazide unit, allowing telmisartan to achieve its optimal alkaline pH for bioavailability without exposing hydrochlorothiazide to alkaline conditions that would cause degradation to DSA. Each drug is formulated in its own pH-appropriate environment.
Solution Approach 2:
The patent introduces acidic excipients (citric acid, ascorbic acid) as intermediaries in the hydrochlorothiazide unit to counteract alkaline degradation. These acidic components create a protective acidic environment that prevents hydrochlorothiazide from degrading to DSA while allowing the tablet to release both drugs simultaneously.
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 achieves enhanced stability of hydrochlorothiazide and simultaneous release of both drugs, as demonstrated by reduced degradation products during stress testing, using conventional equipment and processes.
Implementation Method 1
wherein said unit alone imparts pH above 8 to the 1% by weight aqueous solution or dispersion of said other unit
Implementation Method 2
both active substances need to be released from the composition substantially concomitantly
Data Source
AI summary
A stable formulation of telmisartan and hydrochlorothiazide having both substances in separate units is prepared, exhibiting exceptional stability when subjecting to stress conditions.