AC and PC are abbreviations used in medical terms related to the timing of medication administration. AC stands for "ante cibum," which means "before meals." Medications prescribed with the instruction "AC" are to be taken on an empty stomach, usually around 30 minutes to one hour before a meal. PC stands for "post cibum," which means "after meals." Medications prescribed with the instruction "PC" are to be taken after a meal. These instructions help ensure optimal absorption and minimize potential side effects of the medications. It is essential to follow the specific instructions provided by healthcare professionals for each medication to ensure their effectiveness and safety.