Estimation of drug precipitation upon dilution of pH-cosolvent solubilized formulations

Ryuichi Narazaki, Ritesh Sanghvi, Samuel H. Yalkowsky

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

This manuscript is a study of precipitation of insoluble drug upon dilution from the pH-cosolvent solubilized formulation with simulated blood fluid. An equation is developed to estimate drug precipitation upon dilution of combined pH-cosolvent solubilized formulations. This is an extension of a previous equation used for the estimation of drug precipitation from simple pH controlled formulations. The proposed equation considers the effect of the cosolvent and its concentration on the pKa of the drug as well as all buffering species. According to the proposed equation and our experimental data, the addition of cosolvent on the pH solubilized formulation could increase total drug solubility in the formulation. However, the solubility after dilution became lower than the 0% ethanol formulation because of the change in both drug and buffer pKa values. Since this equation is based on the equilibrium condition, it is the worst case scenario for precipitation. This equation provides useful information regarding the feasibility of the successful use of pH-cosolvent combinations in drug formulation.

Original languageEnglish (US)
Pages (from-to)1203-1206
Number of pages4
JournalChemical and Pharmaceutical Bulletin
Volume55
Issue number8
DOIs
StatePublished - Aug 2007

Keywords

  • Formulation
  • Injectables
  • Log P
  • Precipitation
  • Simulation
  • Solubility

ASJC Scopus subject areas

  • Chemistry(all)
  • Drug Discovery

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