Mag-O-Lax Cattle: "More than an Antacid" Drench and Super Boluses: Large boluses for cattle - 40g pkg./50 Also available in powder - 450g Main Ingredients: Magnesium Hydroxide. Also contains Cascara Sagrata & Licorice Root to stimulate GIT Muscle & Secretion. Ant-acid, Laxative, Ruminatoric for use in cattle to relieve excessive acid and indigestion. Benefits of Cascara: Stimulates Rumen and Intestinal Tract. Reduces the excessive amount of Magnesium which can produce electrolyte imbalances and unnecessary alkalinity.