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A configuration of a refractometer sensor is described with the aim of optically detecting the crystallization process of paracetamol. The developed sensing head is based on a conventional cleaved multi-mode fiber. The fiber tip sensor structure was submitted to contact with the liquid of interest (paracetamol fully dissolved in 40% <i>v</i>/<i>v</i> of ethanol/water) and the crystallization process of paracetamol, induced with continued exposure to air, was monitored in real time.