What is indicated by the abbreviation "ac" on a medical prescription?

The abbreviation "ac" stands for "ante cibum," which is a Latin term meaning "before meals." In medical prescriptions, this indicates that the medication should be taken prior to eating in order to maximize effectiveness or to prevent gastrointestinal upset that can occur when certain medications are taken with food. This is particularly relevant for medications that need to be absorbed on an empty stomach or that might interact negatively with food. Understanding this terminology is important for proper medication administration and ensuring patient compliance with treatment regimens.