Electroanalysis Applied to Compatibility and Stability Assays of Drugs: Carvedilol Study Case

Area of Science:

• Pharmaceutical Sciences
• Electrochemistry
• Drug Delivery Systems

Background:

• Carvedilol (CRV), a non-selective alpha and beta-adrenergic blocker, is widely used for hypertension and heart failure.
• CRV's poor biopharmaceutical properties necessitate investigation into its compatibility and stability within various drug delivery systems.
• Assessing excipient compatibility is crucial for developing stable and effective CRV formulations.

Purpose of the Study:

• To evaluate the suitability of electroanalytical techniques for assessing carvedilol (CRV) compatibility with lipid excipients.
• To identify lipid excipients that are compatible with CRV for potential pharmaceutical formulations.
• To determine the stability of CRV when formulated with selected excipients.

Main Methods:

• Utilized voltammetry and electrochemical impedance spectroscopy to analyze the redox behavior of CRV and lipid excipients.
• Investigated the anode peak potential variation of CRV in the presence of different lipid excipients.
• Assessed the stability of CRV/excipient mixtures at room temperature and elevated temperatures (50 °C).

Main Results:

• Plurol® isostearic, a liquid excipient, and stearic acid demonstrated significant anode peak potential variations, indicating suitability for CRV formulation.
• Carvedilol (CRV) exhibited maximum stability at room temperature and 50 °C when combined with stearic acid at 7% w/w.
• Electrochemical methods proved effective in complementing traditional stability and compatibility studies for redox-active compounds.

Conclusions:

• Electroanalytical tools are valuable for assessing the compatibility and stability of carvedilol (CRV) with lipid excipients.
• Stearic acid is a promising excipient for CRV formulations, enhancing its stability.
• Electrochemical techniques offer a feasible approach to support pharmaceutical formulation development and stability assessments.