Castor Oil USP is an odorless, tasteless stimulant laxative that is used for the temporary relief of occasional constipation. Bowel movement is generally produced in 6 to 12 hours. Do not use when abdominal pain, nausea, or vomiting are present unless directed by a doctor. Frequent or prolonged use may result in the dependence on laxatives. Active Ingredient: Castor Oil 16 fl oz / 473 ml / 1 pt