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Preformulation studies involving moisture uptake in solid dosage forms.

D R Heidemann1, P J Jarosz

  • 1Sandoz Pharmaceuticals Corp., Sandoz Research Institute, Lincoln, Nebraska 68517.

Pharmaceutical Research
|March 1, 1991
PubMed
Summary
This summary is machine-generated.

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Moisture sorption impacts drug stability. Mobile water, not total water, drives degradation, making water-binding excipients crucial for moisture-sensitive drugs.

Area of Science:

  • Pharmaceutical Science
  • Materials Science

Background:

  • Moisture sensitivity is a critical challenge for drug stability in solid dosage forms.
  • Understanding moisture sorption dynamics is essential for formulation development.

Purpose of the Study:

  • To investigate the relationship between moisture sorption rates and the stability of moisture-sensitive drugs.
  • To evaluate the role of mobile water versus total water in drug degradation.
  • To assess the impact of different formulation components on drug-excipient compatibility.

Main Methods:

  • Moisture sorption was quantified by weight gain.
  • Mobile water levels were measured using water activity (aw) assessments.
  • Drug stability was correlated with water activity and material water-binding capacity.

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Main Results:

  • Equilibrium relative humidity (ERH) effectively predicts drug stability in solid dosage forms.
  • Mobile water content is the critical factor in hydrolysis-driven degradation, not total water.
  • Materials with high water-binding capacity showed slower equilibration to higher mobile water levels, enhancing chemical compatibility.

Conclusions:

  • Formulation components significantly influence the stability of moisture-sensitive drugs through their water-binding properties.
  • Controlling mobile water levels via excipient selection is key to improving drug product shelf-life.
  • Water activity measurements provide a predictive tool for assessing drug-excipient interactions and stability.