PMID: 8987073Dec 1, 1996Paper

Guidance in the setting of drug particle size specifications to minimize variability in absorption

Pharmaceutical Research
K C Johnson, A C Swindell

Abstract

To provide guidance in setting particle size specifications for poorly soluble drugs to minimize variability in absorption. A previously reported computer method was used to simulate the percent of dose absorbed as a function of solubility, absorption rate constant, dose, and particle size. The simulated percent of dose absorbed was tabulated over a realistic range of solubilities, absorption rate constants, and doses using drug particle sizes that might be typically found in a dosage form. The greatest effect of particle size on absorption was simulated for low dose- low solubility drugs. In general, the sensitivity of absorption to particle size decreased with increasing dose or solubility. At a solubility of 1 mg/mL, particle size had practically no effect on the percent of dose absorbed over the range of doses simulated (1-250 mg).

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