What does "ac" signify when taking medication?

The designation "ac" stands for "ante cibum," which is a Latin term meaning "before meals." In the context of medication administration, it indicates that the medication should be taken at least 30 minutes to an hour prior to eating. This can be important for certain medications that require an empty stomach to ensure proper absorption or to minimize potential interactions with food. Understanding this terminology is crucial for effective medication management and ensuring that patients receive their medications as intended for optimal therapeutic effects.