Constipation - Metamusil/ kristalose for adults and for children 4yr and older?

Metamucil is a bulk-forming fiber laxative. Psyllium works by absorbing liquid in the intestines and swelling to create a softer, bulky stool that is easier to pass. It is essentially a fiber supplement. You don't say how old your granddaughter is - it is recommended that Metamucil is used under a doctor's supervision for children under 6 years.

The following links may help
Metamucil Information
http://www.drugs.com/mtm/metamucil.html
High Fiber Diet
http://www.drugs.com/cg/high-fiber-diet.html
Constipation
http://www.drugs.com/enc/constipation.html

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Kristalose contains lactulose which is a type of sugar. It is broken down in the large intestine into mild acids that draw water into the colon, which helps soften the stools. This is probably the most common treatment for constipation in children.
Kristalose Information
http://www.drugs.com/mtm/kristalose.html

Neither Kristalose or Metamucil should be given while she is suffering from diarrhea.