It also is a laxative to alleviate constipation. It is also common in people with chronic constipation and laxative abuse. To humans, the fruit are bitter, astringent, laxative, diuretic and a cholagogue. Pure powdered sulfur was used as a medicinal tonic and laxative. The plant is also used as a laxative and an expectorant. Bisacodyl (INN) is an organic compound that is used as a stimulant laxative drug. Ehret developed and marketed the Innerclean Intestinal Laxative. It has been used medicinally as a laxative. Natural anthraquinone derivatives tend to have laxative effects. It is classified as an osmotic laxative. It is a weaker laxative than bisacodyl or castor oil. Some other medicinal purposes are cough suppression, ulcer treatment, and use as a laxative. It is possible for a substance to be both a laxative and a cathartic. The indigestible wax acts as a laxative in humans. Zeman also confused ricin with castor oil and claimed that ricin is a non-poisonous laxative.