What does "4 gtt bid" mean in a medical prescription?

In the context of a medical prescription, "4 gtt bid" signifies the administration of four drops of a medication two times each day. The abbreviation "gtt" stands for "guttae," which is Latin for drops, commonly used in prescriptions to indicate the method of medication delivery, especially in ophthalmology, where eye drops are frequently prescribed. The "bid" stands for "bis in die," which translates to "twice a day."

This notation is essential for ensuring that patients understand their dosing schedule clearly, helping to maximize the effectiveness of the treatment while minimizing any potential side effects from incorrect administration of the medication. The other options do not address this specific combination of the number of drops and the frequency per day, which is why they are not applicable.