Claris lifesciences is an international most admired pharmaceutical company, in the business of manufacturing and marketing of high end injectables with focus on new drug delivery systems for treatment of critical illnesses and diseases. Claris lifesciences offers urthromb. This enzyme, originally isolated from human urine, is now obtained from cultured renal cells. Urothromb an activator of plasminogen with high fibrinolytic activity is a sterile preparation of highly purified enzyme isolated from human urine, which has a molecular weight of 54000 daltons.