The oral daily dosage for docusate sodium is between 10 to 500 milligrams, while the rectal daily dosage is between one to three units, according to Drugs.com. The exact dosage varies with age. Additionally, the rectal dose does not apply to children who are below 6 years old.
A docusate sodium oral dosage that ranges from 50 to 500 milligrams and a rectal dosage ranging from one to three units applies to persons who are aged above 12 years, notes Dugs.com. Children aged 6 to 12 years should take an oral daily dosage of 40 to 120 milligrams or one unit rectal daily dosage. Three- to 6-year-old children can take 20 to 100 milligrams daily, while those below 3 years should take 10 to 40 milligrams orally per day.