Resumen:
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The interactions between pilocarpine (PIL) and the anionic polyelectrolyte carbomer (CBR)
were investigated. The effects of the chemical interactions on the chemical stability of the
drug also were evaluated. The binary system was characterized by nuclear magnetic
resonance techniques, fourier-transform infrared spectroscopy, X-ray powder diffraction,
scanning electron microscopy and thermal analysis. The experiments showed that the
complex, prepared by freeze-drying, is a solid amorphous form different from its precursors,
thereby offering an interesting alternative for the preparation of extended release matrices.
The solution stability of PIL was studied at pH 7 and 8, at 70 ºC. The PIL solution stability
was evaluated al