Gastrointestinal bleedings are relevant side effects in patients during anticoagulant therapy for atrial fibrillation. Direct oral anticoagulants (DOACs) are less correlated with major bleeding events than vitamin K antagonists (VKAs), but concerns are present about the relative risk of gastrointestinal bleeding. Here we report the case of a patient with atrial fibrillation and dementia on DOAC treatment who developed a SSRI-associated thrombocytopenia with subsequent life-threatening bleeding. Physicians should be aware of the possible correlation between SSRI-induced thrombocytopenia and concomitant use of anticoagulant and/or antiplatelet drugs, thus preventing life-threatening bleedings.