In Vitro Drug Release Testing: Overview, Development and Validation

In vitro dissolution and drug release tests evaluate the rate and extent of the drug released from a product in an aqueous medium under defined conditions.

During formulation development, dissolution testing uncovers formulation defects and helps in salt form and excipient selection, ensuring a quality finished product.

These tests monitor drug product stability and the manufacturing process, confirming the product's consistent performance throughout its shelf life.

Additionally, they serve as a quality control measure by validating batch-to-batch reproducibility and detecting variations in composition and manufacturing.

Notably, a dissolution method tailored to the specific drug product and its formulation identifies acceptable and unacceptable drug formulations under the same testing conditions.

In marketed products, the impact of minor formulation modifications on the drug’s bioavailability is assessed by comparing pre- and post-change product dissolution profiles.