The dosage recommendation for adults and children over 12 taking Metamucil Smooth Texture Orange Flavor is 1 tablespoon mixed with 8 ounces of a cool liquid no more than three times a day when constipation first occurs, according to Metamucil. Children under 12 should not use Metamucil daily.
Six- to 11-year old children with occasional constipation can be given one-half of an adult dose of Metamucil Fiber Powder in 8 ounces of a cool liquid no more than three times a day. Before giving Metamucil to children younger than 6 years, a doctor should be consulted, states Metamucil.
Results are usually experienced within a period of 12 to 72 hours.