Physicochemical Properties

Solubility Assessment (bio-buffers and formulation excipients)
Dissolution Testing
Chemical Stability

Dose Vehicle Development & Evaluation

  • Excipient Selection API – Compatibility
    • Vehicle – Suitability
    • Stability (dose vehicle)
  • Artificial Fluids Interactions
    • Simulated (gastric and intestinal fluids)
    • Phosphate-buffered Saline
    • Albumin Solution
  • In Vivo Performance Characterization


In Vivo Evaluation

We offer various surgically ported animal models to help with formulation assessment in addition to the standard rodent, canine and non-human primate models for oral and intravenous dosing. These include rats, dogs, and mini-pigs fitted with intestinal cannulas implanted at various sites for dosing solutions or suspensions, as well as dogs fitted with duodenal fistulas for dosing solids, semi-solids, capsules, and tablets directly into the duodenum. Several of these animal models are available routinely and other custom models can be prepared in line with customer needs.

Example: Steroid danazol administered orally to rats.

Physicochemical Properties

Danazol is a derivative of the synthetic steroid ethisterone, a modified testosterone. Before becoming available as a generic drug, danazol was marketed as Danocrine in the United States.

It was approved by the FDA as the first drug to specifically treat endometriosis in the early 1970s. Labrafil likely forms micelles when mixing with aqueous physiological fluids. This keeps the danazol in solution as opposed to precipitating out as probably occurs with PEG solution.