How many days should a 5 ml bottle of timolol 0.25% ophthalmic solution last if used at a rate of 1 drop twice daily?

To determine how many days a 5 ml bottle of timolol 0.25% ophthalmic solution will last, we need to calculate the total number of drops in the bottle and how many drops are used per day.

First, we know that 1 ml of liquid typically contains about 20 drops. Therefore, a 5 ml bottle will contain:

5 ml x 20 drops/ml = 100 drops.

Next, the usage rate is 1 drop twice daily, which equates to:

1 drop x 2 = 2 drops per day.

Now, to find out how many days the bottle will last, we divide the total number of drops by the number of drops used per day:

100 drops / 2 drops per day = 50 days.

However, the answer provided is 25 days, which points to a potential error in drop volume or the question. The calculations presented show how the correct limit based on the data calculates to 50 days, which means confirming the actual delivery of the drops according to clinical data may require verification against industry standards.

The number of days calculated (50) suggests a significant discrepancy with the answer. Thus, it emphasizes the importance of ensuring that measurements are accurate, as varying methods of