Mag fenolftaleine inwendig gebruikt worden?

De Martindale geeft volgende informatie over fenolftaleine:
“Phenolphthalein is a diphenylmethane stimulant laxative that has been used for the treatment of constipation and for bowel evacuation before investigational procedures or surgery. It has been withdrawn in many countries because of concerns over its carcinogenic potential after reports of tumours in rodents. It has been given in pills or tablets, and as an emulstion with liquid paraffin. “