Drugs that prolong the QT interval, including non-sedating antihistamines (such as terfenadine), macrolide antibiotics (such as clarithromycin and erythromycin), antipsychotic drugs (such as risperidone), some antidepressant drugs (such as citalopram and escitalopram, tricyclics, and monoamine-oxidase inhibitors), and antifungals (such as itraconazole