A patient who has chronic constipation asks the nurse about the use of psyllium (Metamucil). Which information will the nurse include in the response?

Dietary sources of fiber should be eliminated to prevent excessive gas formation.

Use of this type of laxative to prevent constipation does not cause adverse effects.

Fiber-containing laxatives may reduce the absorption of fat-soluble vitamins.

Large amounts of fluid should be taken to prevent impaction or bowel obstruction.