(1) Or sometimes medicine such as milk of magnesia can be mixed with chocolate or strawberry-flavored milk.(2) Some further experimentation, and some work with a pill-pressing machine, provided Astor with two part-filled bottles, one labelled milk of magnesia and the other labelled soluble aspirin.(3) My doctor suggested I use milk of magnesia to combat constipation.(4) But neither of these qualifies: lime is calcium oxide, a compound of calcium and oxygen, and magnesia is magnesium oxide.(5) Another option to help reduce discomfort and speed healing is dabbing a mixture of equal parts water and hydrogen peroxide directly on the sore, followed by a bit of milk of magnesia .(6) I had a colonoscopy last fall and the doctor said that I could take milk of magnesia as often as needed.