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Particle size and content uniformity.

S H Yalkowsky1, S Bolton

  • 1College of Pharmacy, University of Arizona, Tucson 85721.

Pharmaceutical Research
|September 1, 1990
PubMed
Summary
This summary is machine-generated.

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Achieving content uniformity in low-dose tablets requires specific drug particle size distributions. Meeting these particle size specifications is crucial for manufacturing satisfactory low-dose drug products.

Area of Science:

  • Pharmaceutical Sciences
  • Materials Science

Background:

  • The United States Pharmacopeia (USP) Content Uniformity test ensures consistent drug dosage in individual tablets.
  • Manufacturing low-dose tablets presents challenges in achieving uniform drug distribution.

Purpose of the Study:

  • To determine the critical particle size and distribution parameters for drug substances to meet USP Content Uniformity requirements.
  • To establish particle size specifications essential for the successful manufacture of low-dose tablets.

Main Methods:

  • Translating USP Content Uniformity test requirements into physical and mathematical parameters.
  • Modeling particle size distribution using a log-normal distribution for spherical particles.
  • Calculating mean particle size and distribution necessary for high probability of passing the uniformity test.

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Main Results:

  • Calculations reveal specific mean particle size and distribution requirements for passing the content uniformity test.
  • Drug substances not meeting these particle size distribution specifications are unsuitable for manufacturing satisfactory low-dose tablets.
  • The probability of passing the content uniformity test is highly dependent on particle size distribution.

Conclusions:

  • Particle size distribution is a critical quality attribute for drug substances used in low-dose formulations.
  • It is recommended to include limits on particle size distribution in drug substance specifications for low-dose applications.
  • Failure to control particle size distribution can lead to manufacturing failures and non-compliant drug products.