Which abbreviation is commonly used for 'Twice a day' in medical prescriptions?

The abbreviation commonly used for 'Twice a day' in medical prescriptions is BID, which stands for the Latin phrase "bis in die." This term directly translates to "twice a day," indicating that a medication should be taken two times throughout the day, typically spaced out to ensure consistent levels of the drug in the bloodstream.

In contrast, the other abbreviations have different meanings in the medical context. For example, prn stands for "pro re nata," meaning "as needed," which indicates that a medication is taken only when necessary rather than on a regular schedule. ML refers to milliliters, a measurement of volume often used for dosing liquid medications, and QID means "quater in die," which signifies that a medication should be taken four times a day.

Thus, understanding these abbreviations is crucial for proper medication administration and ensuring patient safety in a healthcare setting.