My grandfather is 91 and has chf. doctors have him on lasix (furosemide) to prevent fluid buildup around his heart/lungs. how much water can he drink safely?

Ask his heart MD: At that age - and CHF - the amount of fluid that is safe to take in - can be very specific - and usually is balanced with the urine output - - check with his md - it will depend a lot on his ability of his heart to efficiently pump ( ejection fraction ) - done with echocardiogram, along with his kidney function ( blood tests - especially creatinine, blood urea nitrogen-bun and now GFR - great ? !

It varies: Salt restriction is more important than fluid restriction unless his serum sodium is low. Ask his doctor.