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Crystallization of metformin hydrochloride by solvent evaporation method was carried out in the presence of hydrophilic and hydrophobic polymers to investigate the influence of polymer in the agglomeration of the crystallites in-vitro. Transparent, prismatic shaped crystals (of size: 7 × 2 × 1.5 mm 3) were crystallized in hydrophilic polymer hydroxypropyl methylcellulose (HPMC) and long rod shaped crystal (of size: 20 × 2 × 1.5 mm 3) habits in hydrophobic polymer polyvinylpyrrolidone (PVP K30).fatcat:uvi3g5remvfrxat4mvf46s7jnm