Certoparin (trade names Sandoparin, Embolex) is an antithrombotic medication. It is a low molecular weight heparin, primarily active against factor Xa. Like other low molecular weight heparins, it is used to prevent deep venous thrombosis. Certoparin (trade names Sandoparin, Embolex) is an antithrombotic medication. It is a low molecular weight heparin, primarily active against factor Xa. Like other low molecular weight heparins, it is used to prevent deep venous thrombosis.