What is indicated by the abbreviation "mg"?

The abbreviation "mg" stands for milligram. A milligram is a unit of mass that is equal to one-thousandth of a gram. This measure is commonly used in medicine and pharmacology to specify the dosage of medications because it allows for precise measurement of small amounts of substance. Understanding drug dosages in milligrams is essential for the safe and effective administration of medications to patients.

The other terms listed, such as milligram equivalent, megameter, and mega grain, refer to different measurements and are not applicable to the commonly used abbreviation "mg" in medical contexts. Milligram equivalent is a related but distinct concept used in chemistry to express the amount of a substance based on its ability to react, while megameter and mega grain refer to much larger measurements that do not align with the standard abbreviations in medicine.