Imodium is taken by mouth in either liquid or capsule formula, according to Drugs.com. The recommended dosage for adults is two 2-milligram capsules, for an initial dose of 4 milligrams. This is followed by another 2-milligram capsule after each loose stool, with total dosage not to exceed eight capsules or 16 milligrams daily.
For children ages 2 through 5, the liquid 1 milligram/7.5 milliliter dosage is recommended, while children ages 5 to 12 may take capsule form, notes Drugs.com. The dose for children ages 2 through 5 is 1 milligram taken three times a day for the first day, and then 1 milligram after loose stools, up to three times daily. Children ages 6 to 8 can take 2 milligrams twice daily, up to 4 milligrams per day.