Ximelagatran, a direct thrombin inhibitor, can be taken orally and acts solely by inhibiting the actions of thrombin. Ximelagatran is converted to the active agent melagatran in vivo.

H-Gly-Arg-pNA dihydrochloride (H-Gly-Arg-Pna 2HCl) belongs to the class of peptides that bind to 1,2 thrombin and can be quantified by colorimetric detection at 405 nm as a measure of thrombin activity.

Naroparcil, an orally available thioglycoside analog of 4-methylumbelliferyl β-D-xyloside, showed antithrombotic effects in the Wessler sludge model of venous thrombosis (jugular vein).