Anagrelide‐induced pericardial effusion in a patient with essential thrombocythemia

Pericardial effusion leading to cardiac tamponade can occur due to a multitude of etiologies, one of which is medication adverse effects. In patients with comorbid conditions, this can prove to be a challenge in its co‐management along with the primary disease. We present a rare case of anagrelide‐induced pericardial effusion that is presented with tamponade physiology in a patient with essential thrombocythemia. After cautiously weighing the risks and benefits of further invasive interventions following an unsuccessful pericardiocentesis, the decision was to stop anagrelide while managing the pericardial effusion medically. Therefore, managing pericardial effusion should be tailored to each patient individually through shared decision‐making.