Overview: Magnesium antacids are taken to help relieve indigestion, heartburn, or a sour stomach. You may notice that your poop may be loose, watery, or more frequent when taking a magnesium antacid.

Subcutaneous (subQ or SQ) injections are shots given in the fatty tissue layer (subcutaneous fat) under your skin. Your skin has many layers, and the subcutaneous layer is beneath the epidermis and ...