Losartan for Diffuse Myocardial Fibrosis in Sickle Cell Disease

Losartan dosing for participants \<16 years will be 0.7 mg/kg (maximum of 50 mg) once daily. The dose can be increased to 1.4 mg/kg (maximum of 100 mg once daily) after 2 weeks if the dose was tolerated (no hypotension or hyperkalemia). For patients ≥16 years, the starting dose will be 50 mg once daily which can be increased to 100 mg daily if tolerated after 2 weeks.