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Diazepam is one of most frequently prescribed benzodiazepines. It is classified as a class I substance according to the Biopharmaceutics Classification Scheme (BCS). Diazepam tablets were prepared using different API rawmaterials. Before the formulation, we measured particle size distribution on Malvern Instruments Ltd Mastersizer 2000. The tablets were prepared by employing conventional wet granulation. The formulations were evaluated for hardness, friability, content uniformity, in vitro disintegration time (DT), release profiles. The dissolution profile testing is performed on the two formulations with different particles size distribution. Test parameters were: medium 0.1 mol / l hydrochloric acid, 900 ml, temperature 37°C ± 0.5°C, Mixing Speed 100 rpm, Number of tested tablets 12, Testing Cycle 10, 15, 20, 25 and 30 min. Instrument: Varian Van Kel VK7025, Varian Cary 50. We used the spectrophotometric method with absorbance measuring on 242 nm for quantification. Results for particle size distribution for first Diazepam API particle distribution were d (0.10): 88.743 μm; d (0.50): 305.231 μm; d (0.90): 655.911 μm, and for the second raw-material of API was d (0.10):1.998 μm; d (0.50): 4.419 μm; d (0.90): 8.845 μm. The results of diazepam dissolution for two formulations and f2 value with reference drug are presented in Table 1:

Impact of Particles Size Distribution on Diazepam 5mg Tablets Dissolution