Fed intestinal solubility limits and distributions applied to the Developability classification system.

Area of Science:

• Pharmaceutical Sciences
• Biopharmaceutics
• Drug Development

Background:

• Drug solubility in intestinal fluid is critical for oral dosage form performance and bioavailability.
• The Biopharmaceutics and Developability Classification Systems (DCS) use solubility and permeability to assess oral drug potential.
• Intestinal solubility, influenced by fed and fasted states, impacts drug bioavailability.

Purpose of the Study:

• To evaluate a novel nine-media fed state simulated intestinal fluid system for measuring drug solubility.
• To assess the utility of this system in predicting drug behavior within the Developability Classification Systems (DCS).
• To compare fed state solubility data with existing fasted state data and in vivo food effect studies.

Main Methods:

• Utilized a novel nine-media fed state simulated intestinal fluid system.
• Measured the intestinal solubility of seven model drugs (ibuprofen, mefenamic acid, furosemide, dipyridamole, griseofulvin, paracetamol, acyclovir).
• Compared results with previously published fasted state DCS data and in vivo food effect studies.

Main Results:

• The fed state system generated a range of solubility values for each drug, consistent with existing studies.
• Three drugs showed narrow solubility distributions, unaffected by simulated media component concentrations.
• Fed state solubility data allowed for dose/solubility volume ratio calculation, aiding DCS classification.

Conclusions:

• The novel fed state simulated intestinal fluid system provides valuable in vitro data for predicting in vivo drug performance and solubility-based food effects.
• This system can enhance quality by design formulation approaches and risk-based assessments in drug development.
• Further studies are needed to expand drug coverage and correlate in vitro findings with in vivo results.