In recent years, in association with progress and innovation in the field of pharmaceutical technology, there has been an increasing effort to develop sustained release dosage forms for many drugs due to its advantages in safety and efficacy over immediate release drug products. In this investigation matrix tablets of Metformin hydrochloride are formulated using Water hyacinth powder and its rate retardant activity is studied. Tablets were prepared using wet granulation method with different concentrations of Water hyacinth powder. Fourier Transform Infrared Spectrophotometer (FTIR)...