title: Development and characterization of nanosuspensions of olmesartan medoxomil for bioavailability enhancement.
abstract: BACKGROUND
  Olmesartan medoxomil (OLM), an anti-hypertensive agent administered orally has absolute bioavailability of only 26% due to the poor aqueous solubility (<7.75 μg/ml). The present investigation aimed at enhancing the oral bioavailability of OLM by improving its solubility and dissolution rate by preparing nanosuspensions.
  
  
  METHODS
  The nanosuspensions of OLM were prepared using media milling technique followed by its lyophilization using mannitol as a cryoprotectant. Various formulation as well as process parameters were optimized in order to achieve desirable size and saturation solubility. Characterization of the prepared nanosuspension was done with respect to particle size, zeta potential, saturation solubility, dissolution rate, morphology study (TEM), in-vitro and exvivo drug diffusion study. Evaluation of the crystalline state before and after particle size reduction was done by differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD).
  
  
  RESULTS
  The results indicated that the initial crystalline state is preserved following particle size reduction and that the saturation solubility, dissolution velocity and diffusion rate of the drug from the nanosuspension is significantly higher than that of the plain drug suspension as well as from the marketed tablet formulation.
  
  
  CONCLUSIONS
  Nanosuspension seems to be a promising approach for bioavailability enhancement because of the simple method of its preparation and its universal applicability.
authors.affiliation: Center of Relevance and Excellence in New Drug Delivery system, Pharmacy Department, Shri G.H. Patel Building, Donor's Plaza, Opposite University Main office, The Maharaja Sayajirao University of Baroda, Fatehgunj, Vadodara - 390 002, India.
authors.forename: Hetal Paresh
authors.initials: HP
authors.lastname: Thakkar
authors.forename: Bindesh Vishnubhai
authors.initials: BV
authors.lastname: Patel
authors.forename: Sneha Piyush
authors.initials: SP
authors.lastname: Thakkar