Which antilipemic medication requires caution when used with anticoagulants?

Fenofibrate is the correct answer because this medication can elevate the risk of bleeding when used in combination with anticoagulants like warfarin. This is due to the potential for fenofibrate to displace anticoagulants from protein-binding sites, leading to increased levels of the free drug in circulation and a heightened effect of anticoagulation. This necessitates close monitoring of coagulation parameters when fenofibrate is prescribed alongside anticoagulants to ensure patient safety.

Other antilipemic medications, while they may have their own interactions or risk factors, do not typically carry the same level of concern for increased bleeding when used with anticoagulants. Therefore, fenofibrate stands out as the cautionary choice in this context.