title: Improving tenoxicam solubility and bioavailability by cosolvent system.
abstract: The formulation study of tenoxicam, a poorly water-soluble drug, was developed by use of a ternary cosolvent system and has significantly enhanced the solubility. Additionally, the relative bioavailability of testing formulation was also evaluated by New Zealand rabbit with a single i.m. injection. The three-phase diagram for dimethylsulfoxide (DMSO)/propylene glycol/water, DMSO/ethanol/water, and DMSO/polyethoxylated castor oil/ethanol system was developed. The volume ratio of 5:4:1 in the DMSO/polyethoxylated castor oil/ethanol system resulted in a more suitable vehicle than other systems, with a high solubility (20.73 mg/ml) and low viscosity (10.0 Cp). A pharmacokinetic study of bioequivalence (F (rel) = 0.89) was also obtained. The present study not only provides a novel strategy improving tenoxicam solubility but also helps further scientific knowledge for the development of parenteral formulations.
authors.affiliation: Department of Pharmacy Practice, Tri-Service General Hospital, Neihu, Taipei, Taiwan.
authors.forename: Ming-Kung
authors.initials: MK
authors.lastname: Yeh
authors.forename: Li-Chien
authors.initials: LC
authors.lastname: Chang
authors.forename: Andy Hong-Jey
authors.initials: AH
authors.lastname: Chiou
mesh_terms: D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics*; D001682:Biological Availability; D002368:Castor Oil / Q000031:analogs & derivatives / Q000737:chemistry; D002626:Chemistry, Pharmaceutical; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D000431:Ethanol / Q000737:chemistry; D007273:Injections, Intramuscular; D010894:Piroxicam / Q000008:administration & dosage / Q000031:analogs & derivatives* / Q000737:chemistry / Q000493:pharmacokinetics; D019946:Propylene Glycol / Q000737:chemistry; D011817:Rabbits; D012995:Solubility; D012997:Solvents / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000379:methods*; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D012997:Solvents; D014867:Water; D010894:Piroxicam; D000431:Ethanol; C023040:polyethoxylated castor oil; D019946:Propylene Glycol; D002368:Castor Oil; D004121:Dimethyl Sulfoxide; C032801:tenoxicam