The goal of this work was to achieve fast determination of glucosamine in pharmaceutical formulations by high performance liquid chromatography. Commercial tablets were dissolved in water and after filtration, 6 μL were injected to Luna C18 column (250 mm × 4.6 mm, 5μm). Diode Array Detector (DAD) was set at 193 nm. Using sodium perchlorate (50 mM, pH 6.5): acetonitrile (99:1, v/v) at 0.8 mL min-1 as a mobile phase, glucosamine eluted with the retention time 2.834 min ± 0.003 min and the peak purity in real sample was 998.9 ± 3.3. The detection limits evaluated for peak height and peak area measurements were 0.05 μg mL-1 and 0.02 µg mL-1, respectively. The between-day precision relative standard deviation (RSD) evaluated at two concentration levels was always below 1%.