What instruction does 'AC' mean when indicated on a prescription?

The abbreviation 'AC' stands for "ante cibum," which is Latin for "before meals." When this instruction is indicated on a prescription, it directs the patient to take the medication prior to eating. This is often important for medications that may need to be taken on an empty stomach to ensure optimal absorption or to minimize potential side effects that could occur if taken with food. This instruction is particularly relevant for certain types of medications, including some antacids, certain antibiotics, and others that are more effective when not diluted or interfered with by food substances. Understanding this terminology is essential for pharmacy technicians and healthcare providers to appropriately counsel patients on how to take their medications effectively.