Certified Paraoptometric (CPO) Practice Exam 2025

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How often should a medication prescribed as "Bid" be taken?

Three times daily
Every day
Twice a day
Four times a day

The correct answer is: Twice a day

The term "Bid" is derived from the Latin "bis in die," which translates to "twice a day." When a medication is prescribed with this instruction, it means that the patient should take the medication two times throughout the day. In practice, this often involves taking the medication at evenly spaced intervals to maintain consistent levels of the drug in the system. For example, someone might take the medication in the morning and evening. This dosing schedule is important for the efficacy of certain medications, ensuring that they work as intended while minimizing potential side effects associated with fluctuations in drug levels. Thus, the correct interpretation of "Bid" directly correlates to the necessity of taking the medication twice a day.