This study plans to learn if pravastatin is helpful in slowing down the progression of kidney
disease in adults with autosomal dominant polycystic kidney disease (ADPKD). Pravastatin has
been approved by the Food and Drug Administration (FDA) for adults for treatment of
hyperlipidemia (high cholesterol levels). The investigators are using pravastatin in this
study as an investigational drug for treatment of ADPKD.