<prompt> Sapropterin is used in the treatment ofPhenylketonuriaHereditary Fructose IntoleranceGalactosemiaGauchers disease  <response>: Sapropterin, a synthetic form of tetrahydrobiopterin, which acts as a cofactor in patients with residual PAH activity, is approved by FDA to reduce phenylalanine levels in PKU. Galactosemia- Avoid milk milk products. Hereditary Fructose Intolerance- Complete elimination of sucrose fructose drom diet. Gauchers disease- Enzyme replacement therapy. 