Milk is not an antacid. An antacid is a nonprescription drug that is used to treat heartburn and acid reflux. People should not take antacids with milk, because milk can absorb antacids and reduce their effectiveness.
An antacid may be in the form of a chewable or liquid-filled tablet. The ingredients in antacids may include supplemental calcium, magnesium, some foaming agent and minerals that help neutralize stomach acids.
Milk is an emulsion of fat and protein in water. It also contains minerals, vitamins and dissolved sugar, which is known as a carbohydrate. Milk’s mineral content includes calcium and phosphorus that support normal skeletal development.