What is the purpose of adding a preservative in the suspension-making process?

The purpose of adding a preservative in the suspension-making process primarily focuses on preventing microbial growth. In pharmaceutical formulations, particularly suspensions, maintaining the stability and safety of the product is crucial. Preservatives are chemicals that inhibit the growth of bacteria, fungi, and other microorganisms that could contaminate the product, leading to degradation or health risks for users.

Using a preservative ensures that the suspension remains effective over its intended shelf life, preventing spoilage and maintaining the integrity of the active ingredients. While other factors, such as flavor, viscosity, and pH, are important in formulation, the primary role of preservatives is to maintain the microbiological quality and safety of the product.