Abstract The inclusion complex β-cyclodextrin: nifedipin was prepared in solid state by coprecipitation with 1: 1 mol ratio. The structure of the obtained complex and nifedipin was characterized by use of X-ray diffraction (XR), infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), and differential scanning calorimetry (DSC) methods. The photodegradation of nifedipin and the β-cyclodextrin: nifedipin inclusion complex in solid ...