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Proton pump inhibition (PPI) administered together with antiplatelet and anticoagulant agents reduces the risk of gastrointestinal hemorrhage. Several novel antithrombotic agents have been recently introduced for patients with acute coronary syndrome (prasugrel and ticagrelor) or for patients requiring long-term anticoagulation (dabigatran, rivaroxaban, apixaban, edoxaban, and betrixaban). In fact, these agents might offer even stronger inhibition of platelets or coagulation compared with older agents; therefore, the need for gastroprotection might be even stronger when these new agents are used for long-term antithrombotic therapy. On the contrary, there are several reports regarding an adverse interaction between PPI and antithrombotic agents connected with a reduction in antithrombotic therapy on-treatment levels, implicating a higher risk of thrombosis. This interaction was demonstrated in clopidogrel-treated patients and more recently also in dabigatran-treated patients. This article discusses a possible novel antithrombotic therapy/PPI interaction leading to higher risk of thrombosis.