A ternary system of meloxicam with matching hydrophilic polymer and cyclodextrin for improved stability in liquid preprations

Abstract

The purpose of the study is to investigate the effect of ternary systems consisting of meloxicam with cyclodextrins (HP-β-CD or SBE-β-CD) and different polymers (HA, HPMC and PVP) on the stability of meloxicam. The t_0.9 values of meloxicam were determined within all the aforementioned systems and the influence of various polymers on the alteration in meloxicam's stability was evaluated. All three polymers altered the stability of meloxicam to varying degrees, with the extent of the effect being related to hydrophilicity, concentration of components, and the interaction of the newly formed ternary system. Among them, meloxicam demonstrated its highest degree of stabilization within the ternary system formed by SBE-β-CD&HPMC and HP-β-CD&HA. We characterized the ternary system of meloxicam using differential scanning calorimetry (DSC), X-ray diffraction, and scanning electron microscopy analysis, which determined the presence of ternary system inclusions. In addition, we investigated the optimized prescription of eye drops of meloxicam using the ternary system and further determined that the ternary system improved the stability of the drug in liquid formulations.