Stability of pharmaceutical salts in solid oral dosage forms

Area of Science:

• Pharmaceutical Science
• Solid-State Chemistry
• Physical Chemistry

Background:

• Pharmaceutical salts are widely used in solid dosage forms.
• Salt dissociation can negatively impact drug product performance and stability.
• Understanding salt instability is crucial for ensuring product quality.

Purpose of the Study:

• To provide a comprehensive review of pharmaceutical salt formation and disproportionation.
• To elucidate the fundamental theories governing salt behavior in solid-state formulations.
• To offer strategies for preventing salt dissociation in drug products.

Main Methods:

• Utilizing fundamental acid-base theory, ionic equilibrium, and pH-solubility relationships.
• Reviewing criteria for optimal pharmaceutical salt selection.
• Analyzing factors influencing salt stability in solid dosage forms through case studies.

Main Results:

• Detailed interpretation of salt formation and disproportionation mechanisms in pharmaceutical systems.
• Identification of key factors affecting pharmaceutical salt stability.
• Discussion of practical case studies illustrating salt instability issues.

Conclusions:

• A thorough understanding of salt formation and disproportionation is essential for formulation scientists and engineers.
• Implementing appropriate strategies can prevent salt dissociation during formulation, storage, and manufacturing.
• This knowledge aids in avoiding and resolving pharmaceutical salt instability issues in product design.