Described is a
rectal suppository. The
rectal suppository comprises 6-thioguanine, at least one hard fat, and at least one surfactant. Further or alternatively, the
rectal suppository comprises about 1 to 9 mg of 6-thioguanine. Further or alternatively, there is described a method of preventing, treating and / or managing
inflammatory bowel disease in a subject. The method comprises administering a rectal
suppository to the subject in need thereof. Further or alternatively, there is described a method of manufacturing a rectal
suppository. The method comprises the steps of (a) heating a hard fat to become a liquid hard fat, (b) adding at least one surfactant to the liquid hard fat, (c) adding 6-thioguanine to the liquid hard fat, (d) forming the hard fat into a rectal
suppository. Step (b) is optionally carried out before step (c) or after step (c).