Effect of Tranexamic Acid on Prevention of Recurrence of Hemoptysis

Inclusion Criteria: * age: \>=20 and \<=75 * ER visit or admission for hemoptysis * no evidence of hemoptysis on screening Exclusion Criteria: * anticoagulation treatment * Cr \>= 2.0 mg/dL or urinary protein \>= 2+ or who received renal replacement treatment * hepatic failure: total bilirubin \>= 1.5 mg/dL or AST or ALT \>= 1.5 of upper normal limit level * hypersensitivity to tranexamic acid * pregnant woman * fertile female who don't use contraception